AN EFFICIENT AND ERROR TOLERANT DMC CODEC FOR ERROR CORRECTION TECHNIQUE
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S.PARAMESWARI, BOLLAMREDDI .V.V.SATYANARAYANA
Abstract: Transient multiple cell upsets (MCUs) are becoming major issues in the reliability of memories exposed to radiation environment. To prevent MCUs from causing data corruption, more complex error correction codes (ECCs) are widely used to protect memory, but the main problem is that they would require higher delay overhead. Recently, matrix codes (MCs) based on hamming codes have been proposed for memory protection. The main issue is that they are double error correction codes and the error correction capabilities are not improved in all cases. In this project, novel decimal matrix code (DMC) based on divide-symbol is proposed to enhance memory reliability with lower delay overhead. The proposed DMC utilizes decimal algorithm to obtain the maximum error detection capability. Moreover, the encoder-reuse technique (ERT) is proposed to minimize the area overhead of extra circuits without disturbing the whole encoding and decoding processes. ERT uses DMC encoder itself to be part of the decoder. Further, this project is enhanced using square root Carry select adder for improving propagation delay.
S.PARAMESWARI, BOLLAMREDDI .V.V.SATYANARAYANA
Abstract: Transient multiple cell upsets (MCUs) are becoming major issues in the reliability of memories exposed to radiation environment. To prevent MCUs from causing data corruption, more complex error correction codes (ECCs) are widely used to protect memory, but the main problem is that they would require higher delay overhead. Recently, matrix codes (MCs) based on hamming codes have been proposed for memory protection. The main issue is that they are double error correction codes and the error correction capabilities are not improved in all cases. In this project, novel decimal matrix code (DMC) based on divide-symbol is proposed to enhance memory reliability with lower delay overhead. The proposed DMC utilizes decimal algorithm to obtain the maximum error detection capability. Moreover, the encoder-reuse technique (ERT) is proposed to minimize the area overhead of extra circuits without disturbing the whole encoding and decoding processes. ERT uses DMC encoder itself to be part of the decoder. Further, this project is enhanced using square root Carry select adder for improving propagation delay.
LATENCY OPTIMISED AGING-AWARE RELIABLE MULTIPLIER WITH ADAPTIVE HOLD LOGIC
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1. S.SIVAJYOTHI, 2. P PRASANNA KUMAR
Abstract: In VLSI, scaling methods plays an important role in reducing the power dissipation from one technology node to other technology node. The two major constraints for delay in any VLSI circuits are latency and throughput. The negative bias temperature instability (NBTI) effect occurs when a pMOS transistor is under negative bias (Vgs= -VDD) increasing the threshold voltage of pMOS transistor and reducing the speed. A similar phenomenon, positive bias temperature instability (PBTI) effect occurs when an nMOS transistor is under positive bias. These both effects degrade the transistor speed and system may fail due to timing violations. In this paper, an Adaptive Hold Logic (AHL) circuit is proposed to mitigate the performance degradation due to aging effects. The main objective of this project is to design an aging-aware variable-latency multiplier with the AHL. This project proposes an aging-aware multiplier design with novel adaptive hold logic (AHL) circuit. The multiplier is able to provide higher throughput through the variable latency and can adjust the AHL circuit to mitigate performance degradation that is due to the aging effect. Moreover, the proposed architecture can be applied to a column bypassing multiplier and enhanced using Baugh-wooley multiplication.
1. S.SIVAJYOTHI, 2. P PRASANNA KUMAR
Abstract: In VLSI, scaling methods plays an important role in reducing the power dissipation from one technology node to other technology node. The two major constraints for delay in any VLSI circuits are latency and throughput. The negative bias temperature instability (NBTI) effect occurs when a pMOS transistor is under negative bias (Vgs= -VDD) increasing the threshold voltage of pMOS transistor and reducing the speed. A similar phenomenon, positive bias temperature instability (PBTI) effect occurs when an nMOS transistor is under positive bias. These both effects degrade the transistor speed and system may fail due to timing violations. In this paper, an Adaptive Hold Logic (AHL) circuit is proposed to mitigate the performance degradation due to aging effects. The main objective of this project is to design an aging-aware variable-latency multiplier with the AHL. This project proposes an aging-aware multiplier design with novel adaptive hold logic (AHL) circuit. The multiplier is able to provide higher throughput through the variable latency and can adjust the AHL circuit to mitigate performance degradation that is due to the aging effect. Moreover, the proposed architecture can be applied to a column bypassing multiplier and enhanced using Baugh-wooley multiplication.
OW BANDWIDTH UTILIZED AND LOW POWER FMO/MANCHESTER ENCODERS USING SOLS IN DSRC APPLICATIONS
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1. S.ARUNA KUMARI, 2. A.B.CHANDRIKA
Abstract: The main objective of this project is to design a low power and reusable FM0, Manchester encoder for DSRCS applications. Fully reused VLSI architecture using (similarity-oriented logic simplification) SOLS technique for both FM0 and Manchester encodings is proposed. Dedicated short-range communications are one-way or two-way short-range to medium-range wireless communication channels specifically designed for automotive use and a corresponding set of protocols and standards. The SOLS technique eliminates the limitation on hardware utilization by two core techniques: area compact retiming and balance logic-operation sharing. The balance logic-operation sharing efficiently combines FM0 and Manchester encodings with the identical logic components. Further, this project is enhanced by using clock gating technique; we are going to reduce the power in memory organization. Power supply will be provided to corresponding accessed rows only.
1. S.ARUNA KUMARI, 2. A.B.CHANDRIKA
Abstract: The main objective of this project is to design a low power and reusable FM0, Manchester encoder for DSRCS applications. Fully reused VLSI architecture using (similarity-oriented logic simplification) SOLS technique for both FM0 and Manchester encodings is proposed. Dedicated short-range communications are one-way or two-way short-range to medium-range wireless communication channels specifically designed for automotive use and a corresponding set of protocols and standards. The SOLS technique eliminates the limitation on hardware utilization by two core techniques: area compact retiming and balance logic-operation sharing. The balance logic-operation sharing efficiently combines FM0 and Manchester encodings with the identical logic components. Further, this project is enhanced by using clock gating technique; we are going to reduce the power in memory organization. Power supply will be provided to corresponding accessed rows only.
Dynamic Stability Improvement of Four Parallel-Operated PMSG-Based Offshore Wind Turbine Generators Fed to a Power System Using a STATCOM
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ALEKHYA BALLEM, M.PRATHIBHA
Abstract: ABSTRACT-This paper presents the stability-improvement results of four parallel-operated offshore wind turbine generators (WTGs) connected to an onshore power system using a static synchronous compensator (STATCOM). In this project have the fast advance of high-capacity power-electronics technology, large commercial wind turbine generators can be practically employed to contribute high generated power to power systems, where wind PMSGs with full back-to-back converters have proven to be good choices for high-power WTGs. Basically, the grid-side converter of the PMSG-based WTG can be operated as a STATCOM. Many manufacturers also provide this option even for the case when the WTG is not running. But in a real PMSG-based OWF, It has several PMSG-based WTGs operating together, and it is difficult to control reactive power of all WTGs at the same time to supply adequate reactive power to the system. Hence, to guarantee good power quality (PQ) of the system, an additional VAR compensator is required . In this project, a STATCOM is proposed as a VAR compensator. It can be concluded from the simulation results that the proposed STATCOM joined with the designed damping controller can effectively improve the stability of the studied SG-based onshore power system under various disturbance conditions .The results are obtained from the MATLAB/ SIMULINK environment.
ALEKHYA BALLEM, M.PRATHIBHA
Abstract: ABSTRACT-This paper presents the stability-improvement results of four parallel-operated offshore wind turbine generators (WTGs) connected to an onshore power system using a static synchronous compensator (STATCOM). In this project have the fast advance of high-capacity power-electronics technology, large commercial wind turbine generators can be practically employed to contribute high generated power to power systems, where wind PMSGs with full back-to-back converters have proven to be good choices for high-power WTGs. Basically, the grid-side converter of the PMSG-based WTG can be operated as a STATCOM. Many manufacturers also provide this option even for the case when the WTG is not running. But in a real PMSG-based OWF, It has several PMSG-based WTGs operating together, and it is difficult to control reactive power of all WTGs at the same time to supply adequate reactive power to the system. Hence, to guarantee good power quality (PQ) of the system, an additional VAR compensator is required . In this project, a STATCOM is proposed as a VAR compensator. It can be concluded from the simulation results that the proposed STATCOM joined with the designed damping controller can effectively improve the stability of the studied SG-based onshore power system under various disturbance conditions .The results are obtained from the MATLAB/ SIMULINK environment.
Improved Active Power Filter Performance for Renewable Power Generation Systems
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KALYANI. KATTEKOLA, J.NAVEEN
Abstract: An active power filter implemented with a four-leg voltage-source inverter using a predictive control scheme is presented. The use of a four-leg voltage-source inverter allows the compensation of current harmonic components, as well as unbalanced current generated by single-phase nonlinear loads. Now a day’s due to increase in the power demand, generation has to be increased. Due to which the fossil fuels are using out which creates the pollution too. Hence we are using the Renewable energy sources which neither creates pollution problems nor energy conservation problems. Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters. Among the Renewable energy resources most abundantly available throughout the earth is Sun radiation. In order to convert the solar radiation to Electrical energy we use PV Cell. Hence designed PV Cell is applied to the converter and given to the grid. Even many techniques proposed the Modeling and designing of the PV Cell and its interface to the grid, it suffers from many controlling problems due the Non linear characteristics of the Load. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1) power converter to inject power generated from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously.
KALYANI. KATTEKOLA, J.NAVEEN
Abstract: An active power filter implemented with a four-leg voltage-source inverter using a predictive control scheme is presented. The use of a four-leg voltage-source inverter allows the compensation of current harmonic components, as well as unbalanced current generated by single-phase nonlinear loads. Now a day’s due to increase in the power demand, generation has to be increased. Due to which the fossil fuels are using out which creates the pollution too. Hence we are using the Renewable energy sources which neither creates pollution problems nor energy conservation problems. Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters. Among the Renewable energy resources most abundantly available throughout the earth is Sun radiation. In order to convert the solar radiation to Electrical energy we use PV Cell. Hence designed PV Cell is applied to the converter and given to the grid. Even many techniques proposed the Modeling and designing of the PV Cell and its interface to the grid, it suffers from many controlling problems due the Non linear characteristics of the Load. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1) power converter to inject power generated from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously.
A NINE LEVEL GRID CONNECTED CONVERTER TOPOLOGY FOR 1-PHASE TRANSFORMER LESS PV SYSTEMS
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MOUNIKA. TALLURI, B.SHIVAJI
Abstract: This paper presents three phase nine level inverter for grid connected PV system. According to the configuration of the PV system, the inverters are categorized, conversion stages of the contained by inverter depends upon whether they use transformers or not. According to the PV systems, the transformer less inverters facing some known problems and challenges with and without transformers. By the use of without transformer have several advantages like less weight, space occupied by the system (volume) and cost of system. With these they have shown higher efficiencies compared to with transformer architectures. The most important issue without transformer inverter is eliminating the leakage current in grid-connected photovoltaic system applications, where as how to remain the constant common-mode voltage to decrease the leakage current is the technical challenge. In this project presented about that a novel three phase three-level topology for transformer less photovoltaic systems. also with this we can completely reduced the CM ground leakage current. The negative voltage for the AC grid current generation, virtual DC bus is also created. By using the switched capacitor technology for the virtual DC bus, it can reduce the number of elements in the system. Therefore, the cost of power electronic equipments are reduced .With this topology we are using unipolar SPWM to reduce the output current ripple. To regulate the flying-capacitor voltage a suitable switching strategy is also employed, which can improves its efficiency, with the help of a novel dedicated transient circuit we can minimize the common-mode leakage current. The simulation result of the proposed topology using MATLAB/SIMULINK.
MOUNIKA. TALLURI, B.SHIVAJI
Abstract: This paper presents three phase nine level inverter for grid connected PV system. According to the configuration of the PV system, the inverters are categorized, conversion stages of the contained by inverter depends upon whether they use transformers or not. According to the PV systems, the transformer less inverters facing some known problems and challenges with and without transformers. By the use of without transformer have several advantages like less weight, space occupied by the system (volume) and cost of system. With these they have shown higher efficiencies compared to with transformer architectures. The most important issue without transformer inverter is eliminating the leakage current in grid-connected photovoltaic system applications, where as how to remain the constant common-mode voltage to decrease the leakage current is the technical challenge. In this project presented about that a novel three phase three-level topology for transformer less photovoltaic systems. also with this we can completely reduced the CM ground leakage current. The negative voltage for the AC grid current generation, virtual DC bus is also created. By using the switched capacitor technology for the virtual DC bus, it can reduce the number of elements in the system. Therefore, the cost of power electronic equipments are reduced .With this topology we are using unipolar SPWM to reduce the output current ripple. To regulate the flying-capacitor voltage a suitable switching strategy is also employed, which can improves its efficiency, with the help of a novel dedicated transient circuit we can minimize the common-mode leakage current. The simulation result of the proposed topology using MATLAB/SIMULINK.
BACK-PROPAGATION CONTROL ALGORITHM FOR POWER QUALITY IMPROVEMENT USING DSTATCOM
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NIRMALA B, P.PRAVALLIKA
Abstract: This project exhibits the execution of a three stage distribution static compensator (DSTATCOM) by utilizing a back propagation (BP) control algorithm for its capacities, for example, load balancing and reactive power compensation zero voltage regulation under nonlinear loads .For the extraction of the crucial weight estimation of dynamic here we are utilizing BP-based control algorithm. And BP based control algorithm is also used for the estimation of receptive power parts of burden streams which are required for the estimation of reference source streams. Control of power quality devices by neural networks is a latest research area in filed of power engineering. Extraction of harmonic components decides the performance of compensating devices. Here we are using DSTATCOM and UPFC as compensating devices. A model of DSTATCOM is created utilizing a computerized signal processor, and its execution is concentrated on under different working conditions. The execution of DSTATCOM is observed to be acceptable with the proposed control algorithm for different sorts of burdens. A BP based control algorithm is used for extraction of fundamental weighted value of active and reactive power components of load currents. Back propagation algorithm which is trained the sample can detect the signal of power quality problem in real-time. Continuity, differentiability, non-decreasing momotomy are the main characteristics of this algorithm. The operation of UPFC is similar to the DSTATCOM but the only advantage is that it does not make the system shut down under worse conditions. A simulation model is designed with ANFIS and its performance is studied under various operating conditions. The performance of ANFIS is found satisfactory with proposed control algorithm for various types of loads. The proposed system is verified by the results of MATLAB/Simulink.
NIRMALA B, P.PRAVALLIKA
Abstract: This project exhibits the execution of a three stage distribution static compensator (DSTATCOM) by utilizing a back propagation (BP) control algorithm for its capacities, for example, load balancing and reactive power compensation zero voltage regulation under nonlinear loads .For the extraction of the crucial weight estimation of dynamic here we are utilizing BP-based control algorithm. And BP based control algorithm is also used for the estimation of receptive power parts of burden streams which are required for the estimation of reference source streams. Control of power quality devices by neural networks is a latest research area in filed of power engineering. Extraction of harmonic components decides the performance of compensating devices. Here we are using DSTATCOM and UPFC as compensating devices. A model of DSTATCOM is created utilizing a computerized signal processor, and its execution is concentrated on under different working conditions. The execution of DSTATCOM is observed to be acceptable with the proposed control algorithm for different sorts of burdens. A BP based control algorithm is used for extraction of fundamental weighted value of active and reactive power components of load currents. Back propagation algorithm which is trained the sample can detect the signal of power quality problem in real-time. Continuity, differentiability, non-decreasing momotomy are the main characteristics of this algorithm. The operation of UPFC is similar to the DSTATCOM but the only advantage is that it does not make the system shut down under worse conditions. A simulation model is designed with ANFIS and its performance is studied under various operating conditions. The performance of ANFIS is found satisfactory with proposed control algorithm for various types of loads. The proposed system is verified by the results of MATLAB/Simulink.
A HIGH FREQUENCY LINK MULTIMETER CASECADED MEDIUM- VOLTAGE CONVERTER FOR DIRECT GRID INTEGRATION OF RENEWABLE ENERGY SYSTEMS
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RANI DHARAVATH, R.VAJRAMMA
Abstract-This paper proposes a novel energy conversion system for variable speed drives. It consists of a wound rotor machine and an inverter without any rectifier and input filter. In the proposed system, the stator of the machine is directly connected to a single-phase grid and the rotor is connected to three-phase inverter isolated with any external power source. The inverter can not only be connected through slip rings but also integrated on the rotor due to the structure. In this paper, based on the positive and negative sequence model, the rotor, stator powers, and the torque capability in the rotor energy balance and unity grid power factor are analyzed using fuzzy logic controller. From these analyses, the vector control methods of the torque, speed, the dc-link voltage of the isolated inverter, and the grid power factor are proposed. Since the power supplied from the single-phase grid is pulsating and the machine is directly connected to the grid, the controlled torque and power inevitably pulsates at twice the grid frequency. Nevertheless, the machine can start, accelerate, and decelerate in the wide range. The simulation results present the performance and the feasibility of the proposed system using fuzzy logic controller.
RANI DHARAVATH, R.VAJRAMMA
Abstract-This paper proposes a novel energy conversion system for variable speed drives. It consists of a wound rotor machine and an inverter without any rectifier and input filter. In the proposed system, the stator of the machine is directly connected to a single-phase grid and the rotor is connected to three-phase inverter isolated with any external power source. The inverter can not only be connected through slip rings but also integrated on the rotor due to the structure. In this paper, based on the positive and negative sequence model, the rotor, stator powers, and the torque capability in the rotor energy balance and unity grid power factor are analyzed using fuzzy logic controller. From these analyses, the vector control methods of the torque, speed, the dc-link voltage of the isolated inverter, and the grid power factor are proposed. Since the power supplied from the single-phase grid is pulsating and the machine is directly connected to the grid, the controlled torque and power inevitably pulsates at twice the grid frequency. Nevertheless, the machine can start, accelerate, and decelerate in the wide range. The simulation results present the performance and the feasibility of the proposed system using fuzzy logic controller.
Wound Rotor Machine Fed by a Single-Phase Grid and Controlled by an Isolated Inverter
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RAZIYA BEGUM SK, K.GANGA BHAVANI
ABSTRACT:This paper proposes a novel energy conversion system for variable speed drives. It consists of a wound rotor machine and an inverter without any rectifier and input filter. In the proposed system, the stator of the machine is directly connected to a single phase grid and the rotor is connected to three-phase inverter isolated with any external power source. The inverter can not only be connected through slip rings but also integrated on the rotor due to the structure. In this paper, based on the positive and negative sequence model, the rotor, stator powers, and the torque capability in the rotor energy balance and unity grid power factor are analyzed using fuzzy logic controller. From these analyses, the vector control methods of the torque, speed, the dc-link voltage of the isolated inverter, and the grid power factor are proposed. Since the power supplied from the single-phase grid is pulsating and the machine is directly connected to the grid, the controlled torque and power inevitably pulsates at twice the grid frequency. Nevertheless, the machine can start, accelerate, and decelerate in the wide range. The simulation results present the performance and the feasibility of the proposed system using fuzzy logic controller .
RAZIYA BEGUM SK, K.GANGA BHAVANI
ABSTRACT:This paper proposes a novel energy conversion system for variable speed drives. It consists of a wound rotor machine and an inverter without any rectifier and input filter. In the proposed system, the stator of the machine is directly connected to a single phase grid and the rotor is connected to three-phase inverter isolated with any external power source. The inverter can not only be connected through slip rings but also integrated on the rotor due to the structure. In this paper, based on the positive and negative sequence model, the rotor, stator powers, and the torque capability in the rotor energy balance and unity grid power factor are analyzed using fuzzy logic controller. From these analyses, the vector control methods of the torque, speed, the dc-link voltage of the isolated inverter, and the grid power factor are proposed. Since the power supplied from the single-phase grid is pulsating and the machine is directly connected to the grid, the controlled torque and power inevitably pulsates at twice the grid frequency. Nevertheless, the machine can start, accelerate, and decelerate in the wide range. The simulation results present the performance and the feasibility of the proposed system using fuzzy logic controller .
Dynamic Behavior of DFIG Wind Turbine under Grid Fault Conditions
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SARITHA N, N.MAHESH BABU
ABSTRACT: The dynamic behavior of a DFIG grid connected, wind energy conversion system (WECS) is simulated using MATLAB. This paper presents the different fault conditions like line to ground faults, double line to ground faults and three phase faults. A fuzzy controller is integrated into the doubly fed Induction Generator (DFIG) Wind Energy Conversion System. The dynamic behavior for a DFIG Wind Energy Conversion system with fuzzy controller is simulated for different fault conditions and the results are compared to that of the system with PI Controllers. The comparison shows that the integrated fuzzy controller results in an improvement in the dynamic behavior of the system under transient conditions .
SARITHA N, N.MAHESH BABU
ABSTRACT: The dynamic behavior of a DFIG grid connected, wind energy conversion system (WECS) is simulated using MATLAB. This paper presents the different fault conditions like line to ground faults, double line to ground faults and three phase faults. A fuzzy controller is integrated into the doubly fed Induction Generator (DFIG) Wind Energy Conversion System. The dynamic behavior for a DFIG Wind Energy Conversion system with fuzzy controller is simulated for different fault conditions and the results are compared to that of the system with PI Controllers. The comparison shows that the integrated fuzzy controller results in an improvement in the dynamic behavior of the system under transient conditions .
OPERATION OF A THREE- PHASE POWER CONVERTER CONNECTED TO A DISTRIBUTION SYSTEM
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UMA SREE M, R.VAJRAMMA
ABSTRACT--This paper presents the operation of a 3-phase power connected to a distributed generation (DG) system with photovoltaic system. Distributed generation (DG) system driven by a dc-dc step-up converter and a dc-ac voltage source inverter (VSI) interfaced with the power grid. To create a stable mode when different kinds of loads are connected locally or when working under contingency, the step-up converter must regulate the dc link voltage, allowing the VSI to stabilize its terminal voltage. PI controller is used to regulate voltages and currents, while a phase-locked loop algorithm is used to synchronize the grid and DG.
UMA SREE M, R.VAJRAMMA
ABSTRACT--This paper presents the operation of a 3-phase power connected to a distributed generation (DG) system with photovoltaic system. Distributed generation (DG) system driven by a dc-dc step-up converter and a dc-ac voltage source inverter (VSI) interfaced with the power grid. To create a stable mode when different kinds of loads are connected locally or when working under contingency, the step-up converter must regulate the dc link voltage, allowing the VSI to stabilize its terminal voltage. PI controller is used to regulate voltages and currents, while a phase-locked loop algorithm is used to synchronize the grid and DG.
Cascaded Multilevel Inverter with Developed H Bridge Units
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A.ASHWINI, B.SHIVAJI
Abstract: Nowadays, the multilevel inverters have received much attention because of their considerable advantages such as high power quality, lower harmonic components, lower dv/dt and lower switching Losses. There are three main types of multilevel inverters, Diode clamp multilevel inverter, flying capacitor multilevel Inverter, and cascaded multilevel inverter. The Cascaded multilevel inverters have received special attention due to the modularity and simplicity of control. Here, a new single- phase cascaded multilevel inverter based on novel H-bridge units is introduced. In order to generate all voltage levels (even and odd) at the output, different algorithms can be to determine the magnitudes of dc voltage sources. Then, the new algorithms are compared to investigate their advantages and disadvantages. This topology is able to increase the number of output voltage levels by using a lower number of power electronic devices such as switches, power diodes, driver circuits, and dc voltage sources that lead to reduction in installation space and cost of the inverter. In addition, in the new cascaded multilevel inverter, not only the number of required power electronic devices is reduced, but also the amount of the blocked voltage by switches, and the number of different voltage amplitudes of the used sources is decreased. These features are some of the most important advantage of the new topology. Simulation is done in MATLAB 2009a environment and the waveforms are obtained. For the experimental setup the dc sources selected are 2V, 4V, 14V, 28V.
A.ASHWINI, B.SHIVAJI
Abstract: Nowadays, the multilevel inverters have received much attention because of their considerable advantages such as high power quality, lower harmonic components, lower dv/dt and lower switching Losses. There are three main types of multilevel inverters, Diode clamp multilevel inverter, flying capacitor multilevel Inverter, and cascaded multilevel inverter. The Cascaded multilevel inverters have received special attention due to the modularity and simplicity of control. Here, a new single- phase cascaded multilevel inverter based on novel H-bridge units is introduced. In order to generate all voltage levels (even and odd) at the output, different algorithms can be to determine the magnitudes of dc voltage sources. Then, the new algorithms are compared to investigate their advantages and disadvantages. This topology is able to increase the number of output voltage levels by using a lower number of power electronic devices such as switches, power diodes, driver circuits, and dc voltage sources that lead to reduction in installation space and cost of the inverter. In addition, in the new cascaded multilevel inverter, not only the number of required power electronic devices is reduced, but also the amount of the blocked voltage by switches, and the number of different voltage amplitudes of the used sources is decreased. These features are some of the most important advantage of the new topology. Simulation is done in MATLAB 2009a environment and the waveforms are obtained. For the experimental setup the dc sources selected are 2V, 4V, 14V, 28V.
A NEW THREE PHASE MULTILEVEL INVERTER WITH REDUCED NUMBER OF POWER ELECTRONIC COMPONENTS
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JYOTHI. N, M.PRATHIBHA
ABSTRACT- In this paper, a new configuration of a three-phase nine-level multilevel voltage-source inverter is introduced along with fuzzy logic. A multilevel dc link using fixed dc voltage supply and cascaded half-bridge is connected in such a way that the proposed inverter outputs the required output voltage levels. Here we are using fuzzy logic controller instead of using other controllers. The fundamental frequency staircase modulation technique is easily used to generate the appropriate switching gate signals. For the purpose of increasing the number of voltage levels with fewer number of power electronic components, the structure of the proposed inverter is extended and different methods to determine the magnitudes of utilized dc voltage supplies are suggested. Moreover, the prototype of the suggested configuration is manufactured as the obtained simulation and hardware results ensured the feasibility of the configuration and the compatibility of the modulation technique is accurately noted.
JYOTHI. N, M.PRATHIBHA
ABSTRACT- In this paper, a new configuration of a three-phase nine-level multilevel voltage-source inverter is introduced along with fuzzy logic. A multilevel dc link using fixed dc voltage supply and cascaded half-bridge is connected in such a way that the proposed inverter outputs the required output voltage levels. Here we are using fuzzy logic controller instead of using other controllers. The fundamental frequency staircase modulation technique is easily used to generate the appropriate switching gate signals. For the purpose of increasing the number of voltage levels with fewer number of power electronic components, the structure of the proposed inverter is extended and different methods to determine the magnitudes of utilized dc voltage supplies are suggested. Moreover, the prototype of the suggested configuration is manufactured as the obtained simulation and hardware results ensured the feasibility of the configuration and the compatibility of the modulation technique is accurately noted.
STARTUP METHOD OF AN INDUCTION MOTORS DRIVEN BY A MODULATOR MULTILEVEL
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KALPANA .P, K.GANGA BHAVANI
Abstract- This paper presents theoretical and simulation discussions on a practical speed-Sensorless start-up method for an induction motor driven by a modular multilevel cascade inverter based on double-star chopper cells (MMCI-DSCC) from standstill to middle speed using fuzzy controller. This motor drive is suitable, particularly for a large-capacity fan- or blower-like load. The load torque is proportional to a square of the motor mechanical speed. The start-up method is characterized by combining capacitor-voltage control with motor-speed control. The motor-speed control with the minimal stator current plays a crucial role in eliminating a speed sensor from the drive system and in reducing an ac voltage fluctuation occurring across each dc capacitor. Several start-up waveforms show stable performance from standstill to middle speed with different load torques. Simulation waveforms can be verified by using MATLAB/SIMULINK.
KALPANA .P, K.GANGA BHAVANI
Abstract- This paper presents theoretical and simulation discussions on a practical speed-Sensorless start-up method for an induction motor driven by a modular multilevel cascade inverter based on double-star chopper cells (MMCI-DSCC) from standstill to middle speed using fuzzy controller. This motor drive is suitable, particularly for a large-capacity fan- or blower-like load. The load torque is proportional to a square of the motor mechanical speed. The start-up method is characterized by combining capacitor-voltage control with motor-speed control. The motor-speed control with the minimal stator current plays a crucial role in eliminating a speed sensor from the drive system and in reducing an ac voltage fluctuation occurring across each dc capacitor. Several start-up waveforms show stable performance from standstill to middle speed with different load torques. Simulation waveforms can be verified by using MATLAB/SIMULINK.
SMES/BATTERY ENERGY STORAGE SYSTEM FORELECTRIC BUSES
[View]
KAVYA .A, MD. AIJAZ
ABSTRACT:The energy balancing problem is the main challenge for the effective application of micro combined heat and power (m-CHP) in a residential context. Due to its high energy density and relative robustness, the lead-acid battery is widely used for power demand management to compensate the mismatch between the m-CHP electrical output and domestic demand. However, batteries are not suited to respond effec-tively to high frequency power fluctuations, but when coupled to the m-CHP, they experience frequent short-term charge/discharge cycles and abrupt power changes, which significantly decreases their life-time. This paper addresses this problem by hybridising the lead-acid battery storage with superconduct-ing magnetic energy storage (SMES) to form a hybrid energy storage system (HESS) that is coordinated by a novel sizing based droop control method. The control method for the first time considers both the capacity sizing of the HESS technologies and the droop control method of the battery and the SMES. A hardware in the loop test circuit is developed coupling with the real time digital simulator (RTDS) to ver-ify the performance of the HESS with the new control algorithm. The experimental results show that con-trol method is able to exploit the different characteristics of the SMES and the battery to meet the mismatch of m-CHP power generation and domestic demand. In addition, the lifetime analysis is imple-mented in this paper to quantify the battery lifetime extension in the HESS, which further proves the validity of the proposed control strategy. The electricity generated from the m-CHP is fully used in this system (shown by a, b and c). The m-CHP, the HESS and the grid are all able to support the load demand (shown by a, d and e), hence load demand can always be met. The HESS works as a kind of power transitional device shifting the power among the m-CHP, the load and the grid (shown by b, d and f), which means the energy storage system will undergo many reverse charge or discharge process. The reverse currents are of great detrimental to the battery lifetime. where the Ibat conv is the battery converter current, Im bat is the bat-tery discharge current limit given by manufacturers and the 2 means two cell banks in parallel. It should be figured out that the two parallel where the Ibat conv is the battery converter current, Im bat is the bat-tery discharge current limit given by manufacturers and the 2 means two cell banks in parallel. It should be figured out that the two parallel. In the residential m-CHP system as shown in Fig. 1, for a given load profile and CHP contributions, optimal sizing studies of the HESS should be done to meet both the system energy and power demand. In the proposed SMES/battery HESS, the SMES is sensitive to the short-term high-frequency power fluctuations whereas the battery is designed to deal with the large energy demand. The SMES has large power capacity but cannot store much energy, so the battery is expected as an energy buffer to the SMES. The capac-ity of the HESS needs to meet both the power and energy require-ment to fulfil the power/energy management functions. The hybrid sizing study method which is able to effectively take advantage of different characteristics of ESSs to determine the capacities of the SMES and the battery has been developed in [34], and therefore, is used in this study. It is out of this paper’s scope to introduce the precious sizing method in detail but the detailed size parame-ters of the battery and SMES are given in Appendix, Tables A1 and .
KAVYA .A, MD. AIJAZ
ABSTRACT:The energy balancing problem is the main challenge for the effective application of micro combined heat and power (m-CHP) in a residential context. Due to its high energy density and relative robustness, the lead-acid battery is widely used for power demand management to compensate the mismatch between the m-CHP electrical output and domestic demand. However, batteries are not suited to respond effec-tively to high frequency power fluctuations, but when coupled to the m-CHP, they experience frequent short-term charge/discharge cycles and abrupt power changes, which significantly decreases their life-time. This paper addresses this problem by hybridising the lead-acid battery storage with superconduct-ing magnetic energy storage (SMES) to form a hybrid energy storage system (HESS) that is coordinated by a novel sizing based droop control method. The control method for the first time considers both the capacity sizing of the HESS technologies and the droop control method of the battery and the SMES. A hardware in the loop test circuit is developed coupling with the real time digital simulator (RTDS) to ver-ify the performance of the HESS with the new control algorithm. The experimental results show that con-trol method is able to exploit the different characteristics of the SMES and the battery to meet the mismatch of m-CHP power generation and domestic demand. In addition, the lifetime analysis is imple-mented in this paper to quantify the battery lifetime extension in the HESS, which further proves the validity of the proposed control strategy. The electricity generated from the m-CHP is fully used in this system (shown by a, b and c). The m-CHP, the HESS and the grid are all able to support the load demand (shown by a, d and e), hence load demand can always be met. The HESS works as a kind of power transitional device shifting the power among the m-CHP, the load and the grid (shown by b, d and f), which means the energy storage system will undergo many reverse charge or discharge process. The reverse currents are of great detrimental to the battery lifetime. where the Ibat conv is the battery converter current, Im bat is the bat-tery discharge current limit given by manufacturers and the 2 means two cell banks in parallel. It should be figured out that the two parallel where the Ibat conv is the battery converter current, Im bat is the bat-tery discharge current limit given by manufacturers and the 2 means two cell banks in parallel. It should be figured out that the two parallel. In the residential m-CHP system as shown in Fig. 1, for a given load profile and CHP contributions, optimal sizing studies of the HESS should be done to meet both the system energy and power demand. In the proposed SMES/battery HESS, the SMES is sensitive to the short-term high-frequency power fluctuations whereas the battery is designed to deal with the large energy demand. The SMES has large power capacity but cannot store much energy, so the battery is expected as an energy buffer to the SMES. The capac-ity of the HESS needs to meet both the power and energy require-ment to fulfil the power/energy management functions. The hybrid sizing study method which is able to effectively take advantage of different characteristics of ESSs to determine the capacities of the SMES and the battery has been developed in [34], and therefore, is used in this study. It is out of this paper’s scope to introduce the precious sizing method in detail but the detailed size parame-ters of the battery and SMES are given in Appendix, Tables A1 and .
MODELLING & SIMULATION OF SWITCHED RELUCTANCE MOTORS WITH 3- PHASE & FOUR - PHASE CONFIGURATION
[View]
MADHAVI. K, K V N S. PAVAN KUMAR
Abstract. The comparative study of electric machines has been in vogue due to the growing demand for electromechanical converters with maximum possible efficiency. In this scene, the switched reluctance machines have proven to be competitive. Comparative studies between these machines and the already established induction machines can be easily found in the scientific literature, but studies on various configurations of the switched reluctance machines are not as widespread. This paper shows the modeling, simulation and presents a comparative study of two Switched Reluctance Machines to a single phase (6x6) and three phase (6x4). Aspects of construction, drive and efficiency are discussed in order to find advantages and disadvantages to each of these machines.
MADHAVI. K, K V N S. PAVAN KUMAR
Abstract. The comparative study of electric machines has been in vogue due to the growing demand for electromechanical converters with maximum possible efficiency. In this scene, the switched reluctance machines have proven to be competitive. Comparative studies between these machines and the already established induction machines can be easily found in the scientific literature, but studies on various configurations of the switched reluctance machines are not as widespread. This paper shows the modeling, simulation and presents a comparative study of two Switched Reluctance Machines to a single phase (6x6) and three phase (6x4). Aspects of construction, drive and efficiency are discussed in order to find advantages and disadvantages to each of these machines.
MICROCOMPUTER CONTROL OF SRM
[View]
NAGALAKSHMI. M, K V N S. PAVAN KUMAR
Abstract: Accord to the theory of micro-step control, this study is about a design of a four-phase switched reluctance motor based on DSP-driven control system. Firstly, the study is about the design of the hardware circuit, such as the power inverter and its drive, current detection, position detection and the system power supply. And then to build a switched reluctance motor control system, TMS320L2812 as the core of control. Experiments show that this control strategy control is simple, but able to effectively restrain the torque ripple of switched reluctance motor under low speed.
NAGALAKSHMI. M, K V N S. PAVAN KUMAR
Abstract: Accord to the theory of micro-step control, this study is about a design of a four-phase switched reluctance motor based on DSP-driven control system. Firstly, the study is about the design of the hardware circuit, such as the power inverter and its drive, current detection, position detection and the system power supply. And then to build a switched reluctance motor control system, TMS320L2812 as the core of control. Experiments show that this control strategy control is simple, but able to effectively restrain the torque ripple of switched reluctance motor under low speed.
DESIGN INVESTIGATION OF HYBRID EXCITATION FLUX SWITCHING MACHINE FOR HIGH-SPEED ELECTRIC
VEHICLE
[View]
NAGENDRAMMA .V, P.PRAVALLIKA
Abstract: This paper presents design feasibility study and development of a new hybrid excitation flux switching motor (HEFSM) as a contender for traction drives in hybrid electric vehicles (HEVs). Initially, the motor general construction, the basic working principle and the design concept of the proposed HEFSM are outlined. Then, the initial drive performances of the proposed HEFSM are evaluated based on 2D-FEA, in which the design restrictions, specifications and target performances are similar with conventional interior permanent magnet synchronous motor (IPMSM) used in HEV. Since the initial results fail to achieve the target performances, deterministic design optimization approach is used to treat several design parameters. After several cycles of optimization, the proposed motor makes it possible to obtain the target torque and power of 333 Nm and 123 kW, respectively. In addition, due to definite advantage of robust rotor structure of HEFSM, rotor mechanical stress prediction at maximum speed of 12,400 r/min is much lower than the mechanical stress in conventional IPMSM. Finally, the maximum torque and power density of the final design HEFSM are approximately 11.41 Nm/kg and 5.55 kW/kg, respectively, which is 19.98% and 58.12% more than the torque and power density in existing IPMSM for Lexus RX400h.
NAGENDRAMMA .V, P.PRAVALLIKA
Abstract: This paper presents design feasibility study and development of a new hybrid excitation flux switching motor (HEFSM) as a contender for traction drives in hybrid electric vehicles (HEVs). Initially, the motor general construction, the basic working principle and the design concept of the proposed HEFSM are outlined. Then, the initial drive performances of the proposed HEFSM are evaluated based on 2D-FEA, in which the design restrictions, specifications and target performances are similar with conventional interior permanent magnet synchronous motor (IPMSM) used in HEV. Since the initial results fail to achieve the target performances, deterministic design optimization approach is used to treat several design parameters. After several cycles of optimization, the proposed motor makes it possible to obtain the target torque and power of 333 Nm and 123 kW, respectively. In addition, due to definite advantage of robust rotor structure of HEFSM, rotor mechanical stress prediction at maximum speed of 12,400 r/min is much lower than the mechanical stress in conventional IPMSM. Finally, the maximum torque and power density of the final design HEFSM are approximately 11.41 Nm/kg and 5.55 kW/kg, respectively, which is 19.98% and 58.12% more than the torque and power density in existing IPMSM for Lexus RX400h.
HIGH-VOLTAGE GAIN BOOST CONVERTER BASED ON THREE- STATE COMMUTATION CELL FOR BATTERY CHARGING USING PV
[View]
SABITHA DUPATI, D.SIVA PRASAD
Abstract. This paper presents a dc-dc power converter integrated in such a way to obtain, in a single conversion stage, the maximum energy extraction from photovoltaic panels, battery charging and discharging dynamic control, and high voltage step-up to feed the inverter DC bus, also operating with soft-switching capability. Although this idea can be applied to most of the high voltage gain topologies, this paper is based on a structure derived from the half-bridge boost converter. Thus, a 500W prototype, with input voltage of 24V and output voltage of 200V, has been developed with the purpose of obtaining the experimental results and validate the proposed converter. High efficiency is achieved, above 92.5%, confirming the expected operation and functionalities necessary for the proposed application.
SABITHA DUPATI, D.SIVA PRASAD
Abstract. This paper presents a dc-dc power converter integrated in such a way to obtain, in a single conversion stage, the maximum energy extraction from photovoltaic panels, battery charging and discharging dynamic control, and high voltage step-up to feed the inverter DC bus, also operating with soft-switching capability. Although this idea can be applied to most of the high voltage gain topologies, this paper is based on a structure derived from the half-bridge boost converter. Thus, a 500W prototype, with input voltage of 24V and output voltage of 200V, has been developed with the purpose of obtaining the experimental results and validate the proposed converter. High efficiency is achieved, above 92.5%, confirming the expected operation and functionalities necessary for the proposed application.
A SINGLE PHASE PV INVERTERS TOPOLOGY WITH A SERIES CONNECTED ENERGY BUFFER
[View]
UMARANI. G, D.VISWESWARA RAO
ABSTRACT-Module integrated converters (MICs) have been underrapid development for single-phase grid-tied photovoltaic applications.The capacitive energy storage implementation for thedouble-line-frequency power variation represents a differentiatingfactor among existing designs. This paper introduces a newtopology that places the energy storage block in a series-connectedpath with the line interface block. This design provides independentcontrol over the capacitor voltage, soft-switching for allsemiconductor devices, and the full four-quadrant operation withthe grid. The proposed approach is analyzed and experimentallydemonstrated.
UMARANI. G, D.VISWESWARA RAO
ABSTRACT-Module integrated converters (MICs) have been underrapid development for single-phase grid-tied photovoltaic applications.The capacitive energy storage implementation for thedouble-line-frequency power variation represents a differentiatingfactor among existing designs. This paper introduces a newtopology that places the energy storage block in a series-connectedpath with the line interface block. This design provides independentcontrol over the capacitor voltage, soft-switching for allsemiconductor devices, and the full four-quadrant operation withthe grid. The proposed approach is analyzed and experimentallydemonstrated.
Adaptive PI Control of STATCOM for Voltage Regulation
[View]
BHAVANI PANNERU, N.MAHESH BABU
Abstract: STATCOM can give quick and productive responsive power backing to keep up power system voltage soundness. Previously, different STATCOM control systems have been talked about including numerous utilizations of relative fundamental (PI) controllers. On the other hand, these past works acquire the PI picks up through an experimentation approach or far reaching studies with a tradeoff of execution and relevance. Consequently, control parameters for the ideal execution at a given working point may not be powerful at an alternate working point. This paper proposes another control model taking into account versatile PI control, which can self-change the control additions amid an unsettling influence such that the execution dependably coordinates a fancied reaction, paying little respect to the change of working condition. Since the change is self-governing, this gives the attachment and-play capacity for STATCOM operation. In the reenactment test, the versatile PI control shows steady fabulousness under different working conditions, for example, distinctive introductory control increases, diverse burden levels, change of transmission system, continuous aggravations, and a serious aggravation. Interestingly, the routine STATCOM control with tuned, altered PI picks up for the most part perform fine in the first framework, yet may not execute as productive as the proposed control strategy when there is a change of framework conditions.
BHAVANI PANNERU, N.MAHESH BABU
Abstract: STATCOM can give quick and productive responsive power backing to keep up power system voltage soundness. Previously, different STATCOM control systems have been talked about including numerous utilizations of relative fundamental (PI) controllers. On the other hand, these past works acquire the PI picks up through an experimentation approach or far reaching studies with a tradeoff of execution and relevance. Consequently, control parameters for the ideal execution at a given working point may not be powerful at an alternate working point. This paper proposes another control model taking into account versatile PI control, which can self-change the control additions amid an unsettling influence such that the execution dependably coordinates a fancied reaction, paying little respect to the change of working condition. Since the change is self-governing, this gives the attachment and-play capacity for STATCOM operation. In the reenactment test, the versatile PI control shows steady fabulousness under different working conditions, for example, distinctive introductory control increases, diverse burden levels, change of transmission system, continuous aggravations, and a serious aggravation. Interestingly, the routine STATCOM control with tuned, altered PI picks up for the most part perform fine in the first framework, yet may not execute as productive as the proposed control strategy when there is a change of framework conditions.
DC MICROGRID FOR WIND & SOLAR POWER INTEGRATION
[View]
DURGA VIJAYALAKSHMI, MD.AIJAZ
Abstract- Recently renewable energy power generation is gaining importance for domestic applications because of the growing power demand and increasing concern about the use of fossil fuels in conventional power plant in future. Microgrid provides economically attractive electricity supply to customers with less impact on the environment and installable in small localities or on the same building. By observing these advantages an aggregated model has to be proposed for an integration of renewable sources such as wind and solar power. The power which can be produced from the renewable sources will be synchronized to the ac or to dc consumers through Supercapacitor and BESS (battery energy storage system). In these operations, Supercapacitor and BESS are equipped with the system for reducing power fluctuations, improving power quality and for maintaining the power balance. Thus, in this paper, a review of the wind and solar power integration for the microgrid is given with the Supercapacitor and battery energy storage for the low output fluctuations and the storage of the surplus energy for the future use, respectively, are studied.
DURGA VIJAYALAKSHMI, MD.AIJAZ
Abstract- Recently renewable energy power generation is gaining importance for domestic applications because of the growing power demand and increasing concern about the use of fossil fuels in conventional power plant in future. Microgrid provides economically attractive electricity supply to customers with less impact on the environment and installable in small localities or on the same building. By observing these advantages an aggregated model has to be proposed for an integration of renewable sources such as wind and solar power. The power which can be produced from the renewable sources will be synchronized to the ac or to dc consumers through Supercapacitor and BESS (battery energy storage system). In these operations, Supercapacitor and BESS are equipped with the system for reducing power fluctuations, improving power quality and for maintaining the power balance. Thus, in this paper, a review of the wind and solar power integration for the microgrid is given with the Supercapacitor and battery energy storage for the low output fluctuations and the storage of the surplus energy for the future use, respectively, are studied.
Control of Reduced Rating Dynamic Voltage Restorer with Battery Energy Storage System
[View]
HYMAVATHI. CHIRRA, P.PRUDHVI
ABSTRACT: In this paper, different voltage injection schemes for dynamic voltage restorers (DVRs) are analyzed with particular focus on a new method used to minimize the rating of the voltage source converter (VSC) used in DVR. A new control technique is proposed to control the capacitor-supported DVR. The control of a DVR is demonstrated with a reduced-rating VSC. The reference load voltage is estimated using the unit vectors. The synchronous reference frame theory is used for the conversion of voltages from rotating vectors to the stationary frame. The compensation of the voltage sag, swell, and harmonics is demonstrated using a reduced-rating DVR. . Result shows that this method can compensate voltage sag with a compensation error of 0.99%. Using this method, DVR may reduce voltage THD from 10.22% to 0.66%.
HYMAVATHI. CHIRRA, P.PRUDHVI
ABSTRACT: In this paper, different voltage injection schemes for dynamic voltage restorers (DVRs) are analyzed with particular focus on a new method used to minimize the rating of the voltage source converter (VSC) used in DVR. A new control technique is proposed to control the capacitor-supported DVR. The control of a DVR is demonstrated with a reduced-rating VSC. The reference load voltage is estimated using the unit vectors. The synchronous reference frame theory is used for the conversion of voltages from rotating vectors to the stationary frame. The compensation of the voltage sag, swell, and harmonics is demonstrated using a reduced-rating DVR. . Result shows that this method can compensate voltage sag with a compensation error of 0.99%. Using this method, DVR may reduce voltage THD from 10.22% to 0.66%.
SLIDING MODE CONTROL OF CASECADE MULTILEVEL INVERTER WITH MULTIBAND HYSTERESIS MODULATION SCHEME
[View]
JAYALAKSHMI. L, D.SIVA PRASAD
Abstract:In distribution system (DS), the majority of power consumption has been drawn in reactive loads. These loads are drawn in low power factor and therefore give rise to reactive power burden in the distribution system. So that DSTATCOM controller is used to compensate reactive power, correction of power factor and elimination of current harmonics. This paper presence the 7-Level Cascaded H-bridge Inverter as DSTATCOM for compensation of Balanced and Unbalanced Linear and Non-Linear Loads by using Level Shifted and Phase Shifted PWM techniques. The advantage of CHB Inverter is reducing the number of switches and thus switching losses.The simulation verification of the derived results are provided through a three-phase distribution static compensator (DSTATCOM) model. The application in the three-phase system has been shown through simulation studies.
JAYALAKSHMI. L, D.SIVA PRASAD
Abstract:In distribution system (DS), the majority of power consumption has been drawn in reactive loads. These loads are drawn in low power factor and therefore give rise to reactive power burden in the distribution system. So that DSTATCOM controller is used to compensate reactive power, correction of power factor and elimination of current harmonics. This paper presence the 7-Level Cascaded H-bridge Inverter as DSTATCOM for compensation of Balanced and Unbalanced Linear and Non-Linear Loads by using Level Shifted and Phase Shifted PWM techniques. The advantage of CHB Inverter is reducing the number of switches and thus switching losses.The simulation verification of the derived results are provided through a three-phase distribution static compensator (DSTATCOM) model. The application in the three-phase system has been shown through simulation studies.
A Multifunctional DSTATCOM Operating Under Stiff Source
[View]
MALLIKA KASANI, D.VISWESWARA RAO
Abstract: Recently, developments in power electronics and semiconductor technology have lead improvements in power electronic systems. Pulse Width Modulation variable speed drives are increasingly applied in many new industrial applications that require superior performance for controlling the power flow for this industrial application requires Facts device, which is operated under distribution system is nothing but distributed compensation scheme. A DSTATCOM is capable of compensating either bus voltage or line current. If it operates in a voltage control mode, it can make the voltage of the bus to which it is connected a balanced sinusoid, irrespective of the unbalance and distortion in voltage in the supply side or line current. Similarly when operated in a current control mode, it can force the source side currents to become balanced sinusoids. Loads connected to a stiff source cannot be protected from voltage disturbances using a distribution static compensator (DSTATCOM). In this paper, a new control algorithm based multifunctional DSTATCOM is proposed to operate in voltage control mode under stiff source. This scheme provides fast voltage regulation at the load terminal during voltage disturbances and protects induction machine drive system. The simulation results are obtained using Matlab/Simulink software.
MALLIKA KASANI, D.VISWESWARA RAO
Abstract: Recently, developments in power electronics and semiconductor technology have lead improvements in power electronic systems. Pulse Width Modulation variable speed drives are increasingly applied in many new industrial applications that require superior performance for controlling the power flow for this industrial application requires Facts device, which is operated under distribution system is nothing but distributed compensation scheme. A DSTATCOM is capable of compensating either bus voltage or line current. If it operates in a voltage control mode, it can make the voltage of the bus to which it is connected a balanced sinusoid, irrespective of the unbalance and distortion in voltage in the supply side or line current. Similarly when operated in a current control mode, it can force the source side currents to become balanced sinusoids. Loads connected to a stiff source cannot be protected from voltage disturbances using a distribution static compensator (DSTATCOM). In this paper, a new control algorithm based multifunctional DSTATCOM is proposed to operate in voltage control mode under stiff source. This scheme provides fast voltage regulation at the load terminal during voltage disturbances and protects induction machine drive system. The simulation results are obtained using Matlab/Simulink software.
SUB-SYNCHRONOUS INTERACTION DAMPING CONTROL FOR DFIG WIND TURBINES
[View]
VIJAYALAXMI Y, J.NAVEEN
Abstract: Nowadays with the improvement in the degree of emphasis on new energy, the wind power system has developed more and more rapidly over the world. Usually the wind plants are located in the remote areas which are far from the load centers. Generally series compensated AC transmission and high voltage DC transmission are made use of to improve the transmission capacity as two main effective ways which can solve the problem of large scale wind power transmission. The paper describes the three kinds of impact varieties and impact mechanisms in the sub-synchronous oscillation phenomena of wind power system based on doubly fed induction generator (DFIG) wind generators. At last, we point out the important problem that should be stressed in the wind power system.
VIJAYALAXMI Y, J.NAVEEN
Abstract: Nowadays with the improvement in the degree of emphasis on new energy, the wind power system has developed more and more rapidly over the world. Usually the wind plants are located in the remote areas which are far from the load centers. Generally series compensated AC transmission and high voltage DC transmission are made use of to improve the transmission capacity as two main effective ways which can solve the problem of large scale wind power transmission. The paper describes the three kinds of impact varieties and impact mechanisms in the sub-synchronous oscillation phenomena of wind power system based on doubly fed induction generator (DFIG) wind generators. At last, we point out the important problem that should be stressed in the wind power system.
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