胡长江,魏应冬,陆超,李东东.并网逆变器负序电流优化补偿策略[J].电测与仪表,2021,58(1):109-115. hu chang jiang,wei ying dong,lu chao,li dongdong.Optimal compensation strategy for negative sequence current of grid-connected inverters[J].Electrical Measurement & Instrumentation,2021,58(1):109-115.
并网逆变器负序电流优化补偿策略
Optimal compensation strategy for negative sequence current of grid-connected inverters
Grid-connected inverters are mainly used for transmitting positive sequence active power, it could alse used to compensate reactive current and negative sequence current widely exist in distribution network.A negative sequence current compensation strategy is proposed.For the grid-connected inverter with limited capacity,The negative sequence current compensation strategy improve the compensation capability of negative sequence current while positive sequence power output is maintained. Afterpositive sequence current is determined, the feasible region of negative sequence compensation current is obtained according to the current constraint of the bridge arm.This paper analyzes the effect of negative sequence current optimization compensation strategy on the improvement of compensation capability through MATLAB, and finally establishes PSCAD simulation to verify the effectiveness of the negative sequence current optimization compensation strategy.The results show that the negative sequence current optimization compensation strategy improves the compensation capability of negative sequence current without increasing the power capacity of the device and maintaining the positive sequence power output.
