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Vector Control of the single-phase inverter Based on the Extended and Virtual Circuits

CES Transactions on Electrical Machines and Systems 2018年第3期2卷 320-327页

作者： Tao Xu Ming Yang Naizhe Diao Xianrui Sun Suliang Wu Zhuangzhuang Shen Hongzhi Chen Chonghui Song Department of Information Science&Engineering Northeastern University

A vector control based on the extended equivalent circuit and virtual circuits is proposed for the single-phase *** the extended circuit,the other two phase voltages can be extended by the output voltage of the single-phase inverter so as to construct the voltage *** voltage outer-loop is to control the voltage vector in dq coordinate system,and the output voltage can track the target value without deviation in steady *** designing the virtual circuit,the voltage inner-loop can achieve approximate decoupling and improve the dynamic response under the changeable *** with the traditional dual closed-loop control,the proposed dual closed-loop control scheme only needs to detect and control the voltage without the *** not only can achieve good control effect,but also reduce the complexity of the ***,the simulation and experimental results show that the single-phase inverter has good static and dynamic characteristics regardless of stable load or changeable load.

关键词： Coordinate transformation dual closed-loop control extended circuit single-phase inverter vector control virtual circuit

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Improved Control in single phase inverter Grid-Tied PV System Using Modified PQ Theory

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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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A single-phase Grid-Connected inverter With an Active Power Decoupling Circuit

A Single-Phase Grid-Connected Inverter With an Active Power ...

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第24届中国控制与决策会议

作者： CHEN Zonxiang LING Chao YE Fenghua GE Lusheng School of Electrical Engineering & Information, Anhui University of Technology,Ma’anshan 243002

This paper presents a new single-phase grid-connected inverter with an active power decoupling circuit. In the conventional inverter, electrolytic capacitor with large capacitance has been used in order to balance the instantaneous input and output power. But, the life of the electrolytic capacitor is also greatly influenced by the temperature. This paper presents a new single-phase grid connected inverter that has an active power decoupling circuit. A most distinctive feature of the proposed inverter is that the ripple energy appears in the dc-link capacitor is processed by the active power decoupling circuit. Hence, the small film capacitor could substitute for the large electrolytic capacitor. Finally, the new inverter is verified through simulation.

关键词： single-phase inverter power pulsation MPPT active power decoupling circuit photovoltaic (PV).

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single-phase Grid-connected PV System with Golden Section Search-based MPPT Algorithm

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Chinese Journal of Electrical Engineering 2021年第4期7卷 25-36页

作者： Shuang Xu Riming Shao Bo Cao Liuchen Chang School of Electrical and Control Engineering North China University of TechnologyBeijing 100144China R&D Department Alpha Technologies Inc.Bellingham 98226USA Emera and NB Power Research Centre for Smart Grid Technologies University of New BrunswickFredericton E3B5A3Canada

Maximum power point tracking(MPPT)is a technique employed for with variable-power sources,such as solar,wind,and ocean,to maximize energy extraction under all *** commonly used perturb and observe(P&O)and incremental conductance(INC)methods have advantages such as ease of implementation,but they also have the challenge of selecting the most optimized perturbation step or increment size while considering the trade-off between convergence time and *** address these issues,an MPPT solution for grid-connected photovoltaic(PV)systems is proposed that combines the golden section search(GSS),P&O,and INC methods to simultaneously achieve faster convergence and smaller oscillation,converging to the MPP by repeatedly narrowing the width of the interval at the rate of the golden *** proposed MPPT technique was applied to a PV system consisting of a PV array,boost chopper,and *** and experimental results verify the feasibility and effectiveness of the proposed MPPT technique,by which the system is able to locate the MPP in 36 ms and regain a drifting MPP in approximately 30 ms under transient *** overall MPPT efficiency is 98.99%.

关键词： Grid-connected system maximum power point tracking(MPPT) photovoltaic(PV)system single-phase inverter

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