一种适用于光伏逆变器低电压穿越的锁相技术  

A New Phase-locked Technology Applied to LVRT of Photovoltaic Inverter

作　　者：王俊辉[1] 王彤[1] 宋飞[1] 

机构地区：[1]中国电力科学研究院,江苏南京210003

出　　处：《电力电子技术》2012年第12期95-96,共2页Power Electronics

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.

关 键 词：逆变器 光伏 低电压穿越 正序电压滤过器 锁相 

分 类 号：TM464[电气工程—电器]