Modeling & Analysis Of A Novel Hybrid Active Power Filter Based on the Adaptive Fuzzy Controller
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N.SivaSeshu, Deepika kanna , CH.Samuel Raju
ABSTRACT: This paper deals with a hybrid active power filter with injection circuit (IHAPF). It shows great promise in reducing harmonics and improving the power factor with a relatively low capacity active power filter. This paper concluded that the stability of the IHAPF based on detection supply current is superior to that of others. To minimize the capacity of IHAPF, an adaptive fuzzy dividing frequency-control method is proposed by analyzing the bode diagram, which consists of two control units: a generalized integrator control unit and fuzzy adjustor unit. The generalized integrator is used for dividing frequency integral control, while fuzzy arithmetic is used for adjusting proportional-integral coefficients timely. And the control method is generally useful and applicable to any other active filters. The strategy was proposed for four-and three-wire systems, and it allowed the compensation of current harmonics and reactive power of harmonic current source and harmonic voltage source loads. Compared to other IHAPF control methods, the adaptive fuzzy dividing frequency control shows the advantages of shorter response time and higher control precision. The simulation results show that the new control method is not only easy to be calculated and implemented, but also very effective in reducing harmonics.
N.SivaSeshu, Deepika kanna , CH.Samuel Raju
ABSTRACT: This paper deals with a hybrid active power filter with injection circuit (IHAPF). It shows great promise in reducing harmonics and improving the power factor with a relatively low capacity active power filter. This paper concluded that the stability of the IHAPF based on detection supply current is superior to that of others. To minimize the capacity of IHAPF, an adaptive fuzzy dividing frequency-control method is proposed by analyzing the bode diagram, which consists of two control units: a generalized integrator control unit and fuzzy adjustor unit. The generalized integrator is used for dividing frequency integral control, while fuzzy arithmetic is used for adjusting proportional-integral coefficients timely. And the control method is generally useful and applicable to any other active filters. The strategy was proposed for four-and three-wire systems, and it allowed the compensation of current harmonics and reactive power of harmonic current source and harmonic voltage source loads. Compared to other IHAPF control methods, the adaptive fuzzy dividing frequency control shows the advantages of shorter response time and higher control precision. The simulation results show that the new control method is not only easy to be calculated and implemented, but also very effective in reducing harmonics.
Partial Feedback Linearizing Voltage Stabilization By A Multi Level Dc–Ac Converter With A Novel PWM
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Yeddu Kiran, Gayatri.Buddharaju, K.Venkata Ratnam
ABSTRACT: This paper proposes a system of converters for the integration of a large photovoltaic (PV) plant with a utility AC grid. The system comprises of a central seven-level voltage-fed inverter (VFI) and a large number of PV modules with module-integrated DC-DC converter. The seven-level VFI consists of three three-phase, three-level VFI units connected in parallel on the AC-side. This paper also proposes a new solar power generation system, which is composed of a DC/DC & DC/AC power converter and a new seven-level inverter. This new seven-level inverter is configured using a capacitor selection circuit and a full-bridge power converter, connected in cascade. Seven level converts fed with PV modules provide a viable solution to mitigating harmonic related issues caused by diode or thyristor rectifier front-ends. To handle the large compensation currents and provide better thermal management, two or more paralleled semiconductor switching devices can be used. The proposed PV based seven level topology can also produce seven voltage levels, which significantly reduces the switching current ripple and the size of passive components.The performance of the proposed power converters system is studied using MATLAB/Simulink.
Yeddu Kiran, Gayatri.Buddharaju, K.Venkata Ratnam
ABSTRACT: This paper proposes a system of converters for the integration of a large photovoltaic (PV) plant with a utility AC grid. The system comprises of a central seven-level voltage-fed inverter (VFI) and a large number of PV modules with module-integrated DC-DC converter. The seven-level VFI consists of three three-phase, three-level VFI units connected in parallel on the AC-side. This paper also proposes a new solar power generation system, which is composed of a DC/DC & DC/AC power converter and a new seven-level inverter. This new seven-level inverter is configured using a capacitor selection circuit and a full-bridge power converter, connected in cascade. Seven level converts fed with PV modules provide a viable solution to mitigating harmonic related issues caused by diode or thyristor rectifier front-ends. To handle the large compensation currents and provide better thermal management, two or more paralleled semiconductor switching devices can be used. The proposed PV based seven level topology can also produce seven voltage levels, which significantly reduces the switching current ripple and the size of passive components.The performance of the proposed power converters system is studied using MATLAB/Simulink.
Driven Based Captcha for AI Probabilities
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D.ChandanaPriya, Mrs.R.Deepthi
Abstract: Many protection primitives are depending on difficult statistical issues. Using difficult AI issues for protection is growing as an interesting new model, but has been under explored. In this paper, we present a new protection basic depending on difficult AI issues, namely, a novel family of visual protection password techniques built on top of Captcha technology, which we call Captcha as visual security passwords (CaRP). CaRP is both a Captcha and a visual protection password plan. CaRP details a number of protection issues completely, such as on the internet wondering strikes, pass on strikes, and, if along with dual-view technological innovation, shoulder-surfing strikes. Especially, a CaRP protection password can be found only probabilistically by automated on the internet wondering strikes even if the protection password is in the search set. CaRP also provides a novel approach to address the well-known image hot spot problem in popular visual protection password techniques, such as Pass Points, that often leads to poor protection password choices. CaRP is not a remedy, but it provides reasonable protection and functionality and appears to fit well with some practical programs for enhancing internet protection.
D.ChandanaPriya, Mrs.R.Deepthi
Abstract: Many protection primitives are depending on difficult statistical issues. Using difficult AI issues for protection is growing as an interesting new model, but has been under explored. In this paper, we present a new protection basic depending on difficult AI issues, namely, a novel family of visual protection password techniques built on top of Captcha technology, which we call Captcha as visual security passwords (CaRP). CaRP is both a Captcha and a visual protection password plan. CaRP details a number of protection issues completely, such as on the internet wondering strikes, pass on strikes, and, if along with dual-view technological innovation, shoulder-surfing strikes. Especially, a CaRP protection password can be found only probabilistically by automated on the internet wondering strikes even if the protection password is in the search set. CaRP also provides a novel approach to address the well-known image hot spot problem in popular visual protection password techniques, such as Pass Points, that often leads to poor protection password choices. CaRP is not a remedy, but it provides reasonable protection and functionality and appears to fit well with some practical programs for enhancing internet protection.
A NOVEL METHOD FOR VIDEO STEGANOGRAPHIC SECURITY USING HAMMINGCODE
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Doradla Venkata Sukumar, Vipparla Rama Rao
Abstract: Due to rapid increase of exchange of large data with technological advancements, video steganography is becoming the better solution for offering greater security for large data. In this paper, an enhanced and secured video steganography algorithm is proposed. Hamming code encoding technique and embedding process in DWT domain are the main key concepts used for the project. At embedding phase, initially secret message is secured by encrypting using a key. Then the secret message is encoded using Hamming code. To ensure furthermore security, secret message is XORed with the random value generated by a private key. The processed secret message is then embedded into middle and high frequency DWT coefficients of selected frames of video. For extraction, reverse process takes place. However, for extracting the secret message, keys should be known. This additional feature of using keys makes the technique more robust. The performance parameters like Peak Signal to Noise Ratio (PSNR) and Mean Square Error (MSE) are calculated to determine the quality of stego video. The obtained results have shown that the proposed algorithm for steganography is highly secured with good perceptual invisibility.
Doradla Venkata Sukumar, Vipparla Rama Rao
Abstract: Due to rapid increase of exchange of large data with technological advancements, video steganography is becoming the better solution for offering greater security for large data. In this paper, an enhanced and secured video steganography algorithm is proposed. Hamming code encoding technique and embedding process in DWT domain are the main key concepts used for the project. At embedding phase, initially secret message is secured by encrypting using a key. Then the secret message is encoded using Hamming code. To ensure furthermore security, secret message is XORed with the random value generated by a private key. The processed secret message is then embedded into middle and high frequency DWT coefficients of selected frames of video. For extraction, reverse process takes place. However, for extracting the secret message, keys should be known. This additional feature of using keys makes the technique more robust. The performance parameters like Peak Signal to Noise Ratio (PSNR) and Mean Square Error (MSE) are calculated to determine the quality of stego video. The obtained results have shown that the proposed algorithm for steganography is highly secured with good perceptual invisibility.
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