一起低压变频器异常运行分析及预防措施

Analysis and Preventive Measures of an Abnormal Operation of Low-Voltage Inverters

变频器具有优越的调速性能,并且通过变频改造还能取得不错的节能效果,因此变频器越来越多的被应用于发电厂,但随之而来在运行中也出现了一些问题,如电网由于故障造成电压降低时,一类辅机变频器低电压保护跳闸,将迫使机组降负荷或停运,威胁发电厂的安全稳定运行。文章分析了一起此类事故及预防措施。

The inverter has superior speed control performance and good energy-saving effects can be achieved through frequency conversion,so inverters are more and more used in power plants,but new problems emerge in the operation.If the power grid is degraded due to a fault,some inverters′low voltage protection trip will force the unit to reduce load or stop operation,which can threaten the safe and stable operation of the power plant.This paper analyzes a fault and proposes preventive measures.