大功率压缩机变频器低电压穿越功能故障分析及措施

Fault Analysis and Measures for Low Voltage Ride Through Function of High Power Compressor Unit

从电压跌落及转速变化分析,变频器有足够时间实现旋转再启动,根据电压暂降的特征及低电压穿越功能运行过程中的过电流故障,深入分析了产生过电流的原因,提出过电流故障的解决方案,根据不同特征的变频器可以采用升级检测算法或复位报警的方式解决过电流故障,同时对变频器其他低电压穿越的故障进行了分析,最后分析了低电压穿越功能的现场测试方法,并对变频器低电压穿越历史记录进行检查。

According to the analysis of voltage drop and speed change,the converter has enough time to realize rotary restart.According to the characteristics of voltage drop and the over-current fault during the operation of low voltage ride through(LVRT)function,the causes of over-current were analyzed in depth,and the solution of overcurrent fault was proposed.According to different characteristics,the inverter can solve the over-current fault by using the upgrade detection algorithm or resetting the alarm.At the same time,the other LVRT faults of the inverter were analyzed.Finally,the field test method of the LVRT function was analyzed,and the LVRT history of the inverter was checked.