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Improved Control in Single Phase Inverter Grid-Tied PV System Using Modified PQ Theory

Intelligent Automation & Soft Computing 2023年第8期37卷 2441-2457页

作者： Nur Fairuz Mohamed Yusof Dahaman Ishak Muhammad Ammirrul Atiqi Mohd Zainuri Muhammad Najwan Hamidi Zuhair Muhammed Alaas Mohamed Mostafa Ramadan Ahmed Faculty of Electrical Engineering&Technology Universiti Malaysia Perlis02600ArauMalaysia School of Electrical&Electronic Engineering Universiti Sains Malaysia14300Nibong TebalMalaysia Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaSelangor43600Malaysia School of Engineering Jazan UniversityJazanSaudi Arabia Faculty of Technology and Education Helwan UniversityCairoEgypt

Grid-connected reactive-load compensation and harmonic control are becoming a central topic as photovoltaic(PV)grid-connected systems *** research aims to produce a high-performance inverter with a fast dynamic response for accurate reference tracking and a low total har-monic distortion(THD)even under nonlinear load applications by improving its control *** proposed system is expected to operate in both stand-alone mode and grid-connected *** stand-alone mode,the proposed controller supplies power to critical loads,alternatively during grid-connected mode provide excess energy to the utility.A modified variable step incremental conductance(VS-InCond)algorithm is designed to extract maximum power from *** the proposed inverter controller is achieved by using a modified PQ theory with double-band hysteresis current controller(PQ-DBHCC)to produce a reference current based on a decomposition of a single-phase load *** nonlinear rectifier loads often create significant distortion in the output voltage of single-phase inverters,due to excessive current harmonics in the ***,the proposed method generates a close-loop reference current for the switching scheme,hence,minimizing the inverter voltage distortion caused by the excessive grid current *** simulation findings suggest the proposed control technique can effectively yield more than 97%of power conversion efficiency while suppressing the grid current THD by less than 2%and maintaining the unity power factor at the grid *** efficacy of the proposed controller is simulated using MATLAB/Simulink.

关键词： hysteresis current controller incremental conductance nonlinear load PQ theory single-phase inverter

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Optimized Power Factor Correction for High Speed Switched Reluctance Motor

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Intelligent Automation & Soft Computing 2023年第1期35卷 997-1014页

作者： R.S.Preethishri J.Anitha Roseline K.Murugesan M.Senthil Kumaran Sri Sivasubramaniya Nadar College of Engineering KalavakkamTamilnadu603110India

The Power Factor Correction(PFC)in Switched Reluctance(SR)motor is discussed in this *** SR motors are applicable for multiple applications like electric vehicles,wind mills,machineries *** doubly salient structure of SR motor causes the occurrence of torque ripples,which affects the power factor of the *** improve the power quality,the power factor has to be corrected and the ripples have to be *** order to achieve these objectives,a novel power factor correction(PFC)method is proposed in this ***,the conventional Diode Bridge Rectifier(DBR)is replaced by a Bridgeless Hybrid Resonant(HR)converter,which assists in improvising the output in a wider *** converter is chosen because of having variety of beneficial measures including high *** converter’s output is fed to the SR motor by means of an asymmetric Bridge Resonant(BR)*** proposed converter operates in continuous mode of conduction with the switching frequency of 10 KHz.A hysteresis current controller and Proportional Integral(PI)controller are utilized for reducing the harmonics in the source current along with the regulation of output *** addition,the speed control of SR motor is accomplished by means of the Whale Optimization Algorithm(WOA)assisted PI *** proposed methodology is effective for the control of unity power factor,torque and current *** Total Harmonic Distortion(THD)of the source current is also minimized,which suits the standard of International Electrotechnical Comission IEC *** this methodology,the power factor of 0.99 is achieved with 97%efficiency and 3.92%*** proposed methodology is validated in simulation by MATLAB and in hardware by FPGA Spartan 6E.

关键词： Bridgeless hybrid resonant converter switched reluctance motor BR converter hysteresis current controller PI controller WOA

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An Efficient Particle Swarm Optimization Technique for 4-Leg Shunt Active Power Filter

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Circuits and Systems 2016年第8期7卷 1546-1559页

作者： V. Parimala S. Chenthur Pandian D. Ganeshkumar Department of Electrical and Electronics Engineering P. A. College of Engineering and Technology Pollachi India Department of Electrical and Electronics Engineering SNS College of Technology Coimbatore India

This paper describes the mitigation of harmonics in source and neutral current in three phase four wire system based on 4-leg shunt active power filter under balanced and unbalanced load conditions. Particle Swarm Optimization (PSO) and conventional Proportional Integral (PI) controller are used as control techniques to analyze the control performance of 4-leg shunt active power filter. The synchronous reference frame (SRF) method is used to extract reference current in 4-leg shunt active filter. The hysteresis current controller (HCC) is used to generate gate pulses for Voltage Source Inverter (VSI) based 4-leg shunt active power filter. The proposed PSO technique gives less percentage of Total Harmonic Distortion (THD) value in source and neutral current and settling time of the DC capacitor voltage compared to conventional PI controller technique. The model of the proposed system performance was validated using MATLAB/Simulink environment.

关键词： hysteresis current controller Particle Swarm Optimization Shunt Active Power Filter SRF Method

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Design of DSTATCOM controller for Compensating Unbalances

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Circuits and Systems 2016年第9期7卷 2362-2372页

作者： Murugesan Kullan Ranganath Muthu Jebamalai Benny Mervin Vijayenthiran Subramanian Department of Electrical & Electronics Engineering SSN College of Engineering Chennai India

In a three phase power system, the voltages at the generation side are in sinusoidal and equal in magnitude with 120? phase difference between the phases. However, at the load side voltages may become unbalanced due to unequal voltage magnitudes at the fundamental frequency, phase angle deviations or unequal distribution of single phase loads. The voltage unbalance is a major power quality issue, because a small unbalance in the phase voltages can cause a larger unbalance in the phase currents. A completely balanced three-phase three wire system contains only positive sequence components of voltage, current and impedance, whereas unbalanced system contains both positive and negative sequence components of voltages and currents. The negative sequence component of current in the unbalanced system increases the temperature and losses in the equipments. Hence, it is necessary to mitigate this problem by supplying the negative sequence current to the load at the load side and keep the source side balanced. This paper proposes the shunt connected, current injecting Distribution Static Synchronous Compensator (DSTATCOM) with appropriate controller to mitigate the unbalanced load current. The symmetrical components based hysteresis current controller (HCC) is designed for DSTATCOM to diminish the unbalances in a three-phase three-wire system. The performance of the controller is studied by simulating the entire system in the MATLAB/Simulink environment. The DSTATCOM with HCC is found to be better than other controllers because it is suitable for compensating both balanced and unbalanced loads.

关键词： Compensation DSTATCOM hysteresis current controller Symmetrical Components Unbalanced Systems Negative Sequence current

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