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Photovoltaic Grid-inverter Integrated Control Study Based on Improved Optimal Gradient Method

WANG Bin1,2,YI Lingzhi1,WANG Gen-ping2,Zhang Biao1,DENG Dong1,TANG Jia1(1.College of Information Engineering,Xiangtan University,Hunan,Xiangtan 411105,China;2.Department of Mechanical & Electricity,Shenzhen Polytechnic,Shenzhen 518055,China)  
Three-phase dual-stage photovoltaic grid-connected inverter has the advantage of targeted control and high efficiency.In this paper,improved optimal gradient method used to achieve the Maximum Power Point Tracking(MPPT) and decoupling control of three-phase current tracking with space voltage vector modulation(SVPWM) used to achieve grid tracking simultaneously for dual-stage coordinated control system.In the MATLAB / SIMULINK create a model and simulate the system,results show that the system to better track the maximum power and the output current rapidly and accurately track the grid voltage and has the same frequency and phase as grid.
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