A Novel Algorithm to Improve Dynamic Response of Single Phase Grid-Connected PV Inverter

This paper analyzes a new control algorithm about the input power feed-forward loop control based on the traditional double-loop control strategy. The input power of PV system is used as a reference component of inner current closed-loop, so the reference of the current contains the message of input power. Thus the proposed algorithm can improve the dynamic response of the PV system if mutations appear on the input power of PV system. In order to verify the proposed algorithm, the simulations are carried out using Matlab/Simulink blocks. The comparison of the output current responses, which are based on whether adopt the input power feed-forward loop, is provided. The simulation results verify that the proposed algorithm can improve the dynamic characteristic of PV system, effectively. At last, a 1kW PV inverter is designed based on the proposed control strategy, and the experimental results testify the algorithm is available.