Study of small wind power system's grid-connected inverter based on improved SPWM current control algorithm

摘要

It is important to improve the control algorithm of the grid-connected inverter for the optimization of the Small Wind Power System. There are disadvantages of the traditional SPWM current tracking control algorithm because the output current of the inverter is interfered by the network voltage. The improved SPWM current tracking control algorithm adds the feed forward loop of the network voltage to the original closed loop control system, which could effectively suppress the interference of the network voltage and guarantee the quality of the grid-connected current. In this paper, the advantages and disadvantages of several kinds of grid-connected current tracking control algorithms are compared. And the mathematical model of the closed loop control system is built. Then the paper analyzes the network voltage feed forward control algorithm. Simulation experiments are done based on the improved algorithm. The results verify the method is effective.