HE Jiao, XV Yifei, ZHANG Dehua

 

(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

 

 

Abstract: In order to guarantee the stability of gridconnected inverter and suppress its total harmonic distortion (THD), the dualloop control strategy of three phase photovoltaic(PV) inverter based on grid voltage orientation was investigated. With the introduction of the principle and idea of SVPWM gridconnected strategy, the model of the inverter system was constructed, and the design procedure of the control strategy was described, the detailed design process of parameters was displayed. By using Matlab/Simulink, the control strategy of the threephase photovoltaic gridconnected inverter was simulated. The hardware platform of dualloop control system was built, and the whole system was verified. The experimental results show that the inverter system is sable and the output current is expected to reach synchronization with the grid voltage, the quality of output current meets the specified requirements.

 

Key words: SVPWM; three phase inverter; dualloop control