A Transformerless Photovoltaic Grid-Connected System of Three-Phase Single-Stage Boost Inverter with Coupled Inductor
Zhou Yufei1,Huang Wenxin2,Zhao Ping2
1. Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education Nanjing University of Aeronautics and Astronautics Nanjing 210016 China; 2. Jiangsu Key Laboratiry of New Energy Generation and Power Conversion;Nanjing University of Aeronautics and Astronautics Nanjing 210016 China
Abstract：This paper presents a modified coupled-inductor single-stage boost inverter based grid-connected PV system with proper modulation technique to reduce leakage current. Only a diode is added in the front of the topology compare to the original structure, to block the leakage current loop when in the active states and traditional zero states. On the other hand, the modified near-state PWM (NSPWM) technique is applied with shoot-through zero state in order to reduce the leakage current through the conduction path when shoot-through zero state transform to active state and vice verse. Simulation results for the transformerless photovoltaic system are presented in two cases: CL-SSBI with maximum constant boost(MCB) control and CL-SSBI-D with NSPWM control. Experimental results of transformerless photovoltaic system are also obtained to verify the accuracy of theoretical and simulation models.
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2015, Vol. 30 
