Research on photovoltaic inverter with non-electrolytic capacitor based on AC side power decoupling
DOI：10.7667/PSPC180051
Key Words:power coupling circuit  PV inverter  peak current  pulse energy modulation
Author NameAffiliationE-mail
SHU Zhan Jiangxi Electric Power Company Electric Power Research Institute, Nanchang 330096, China  
CHENG Simeng Jiangxi Electric Power Company Electric Power Research Institute, Nanchang 330096, China  
YANG Yue Jiangxi Electric Power Company Electric Power Research Institute, Nanchang 330096, China  
TAO Xiang Jiangxi Electric Power Company Electric Power Research Institute, Nanchang 330096, China  
ZHANG Yonggao School of Electrical and Automation Engineering East China Jiaotong University, Nanchang 330013, China ygzhang@ecjtu.jx.cn 
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Abstract:A non-electrolytic capacitor PV inverter based on power decoupling circuit in parallel with AC side is presented. The main circuit of proposed inverter adopts the traditional voltage source H-bridge circuit and power decoupling circuit uses a novel double-direction converter with seven switchers, it is connected with AC side of PV inverter. The current hysteresis controller is used in H-bridge converter to realize grid integration and a new control strategy named as pulse energy modulation is adopted in power decoupling circuit. According to the decoupling energy needed by power decoupling circuit, the duty of power device is calculated. Power decoupling circuit adopts the control strategy named peak current controller, which can decrease the capacitance values of decoupling capacitor and make the non-electrolytic capacitor PV inverter come true by increasing the voltage ripple on the decoupling capacitor. The four different operating models of power decoupling circuit are analyzed and the parameters of decoupling inductor and decoupling capacitor are designed. The proposed non-electrolytic capacitor PV inverter and its control strategy are simulated by Matlab/Simulink. The experimental results show that the power decoupling circuit of proposed micro-inverter is effective and can reduce the value of the decoupling capacitor to several tens μF. In this way, it can realize the non-electrolytic capacitor PV inverter, thereby increasing its lifetime. This work is supported by National Natural Science Foundation of China (No. 51467006 and No. 51467005).
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