摘要
给出一种适用于光伏逆变器低电压穿越(LVRT)的锁相技术。通过采用正序电压滤过器滤除电网中的负序电压信号,利用软件锁相环得到电压正序同步角度。实验结果证明,该技术能锁定不平衡电网跌落条件下的正序电压同步角度,为光伏逆变器不对称电压跌落工况提供准确的同步角度,使逆变器在不对称工况下输出稳定电流,促进逆变器成功穿越不对称故障。
A new phase-locked technology applied to low voltage ride through （LVRT） of photovohaic inverter is illus- trated, which gets the angle of the positive sequence voltage by using of the positive sequence filter and phase-locked technology.Experimental results show that the proposed technology is capable of offering the angle of the positive seq- uence voltage and improving the stability of the output current under the condition of unbalanced voltage fault.
出处
《电力电子技术》
CSCD
北大核心
2012年第12期95-96,共2页
Power Electronics
关键词
逆变器
光伏
低电压穿越
正序电压滤过器
锁相
inverter
photovohaic
low voltage ride through
positive sequence voltage filter
phase-locked
