Study on the Correlation between Photovoltaic Low Voltage Ride through and PV Output

The study of low voltage ride through of photovoltaic power generation system mainly focuses on the two aspects: the appropriate control strategy and the addition of external hardware devices. In this paper, a hybrid control method is proposed to improve the low voltage ride through (LVRT) capability. Fault conditions, rapid suppression of voltage fluctuation of photovoltaic power generation system fault current and the DC side of the inverter, improve grid connected photovoltaic power generation system side voltage sag, reactive power regulation and reduced the photovoltaic power generation system, enhance the system transient performance. The MATLAB simulation software is used to build the simulation model of two stage three phase photovoltaic power generation system, and the simulation results are used to verify the effectiveness of the proposed control method in the system application.