Control Strategy of Grid-Connected Inverter Suppressing Grid-Voltage Background Harmonics Based on the Improved Passive Damping Method

摘要

The chapter analyzes the current waveform performance of grid-connected inverter in the condition of grid-voltage background harmonics and calculates the feedforward function. To overcome the disadvantages of passive damping, a method of resistor virtualization instead of damping resistor is derived. The simulation results verify the correctness of theory and effectiveness. The theoretical analysis, with simple method and clear mentality, increases the working efficiency of inverter and improves control strategy to realize no-wastage. Moreover, it can be applied to LCL-filter PWM rectifier or active power filter (APF). The study has good application prospects and popularization value.