变频器干扰造成机组停机事故分析

Analysis of Unit Shutdown Accident Caused by Inverter Interference

变频器是燃气发电机组启动系统的主要设备,其工作时产生的高频谐波会对燃气发电机组的控制系统造成较大干扰,某发电站多次发生因干扰导致发电机后备超速保护误启动,而造成的停机事故。文章主要对变频器干扰产生的原理、发电机后备超速误动原因进行分析,并提出防止干扰影响的一些措施。

Frequency converter is the main equipment of the starting system of the gas generator set.The high-frequency harmonic generated during its operation causes great interference to the control system of the gas generator set.A power station had several shutdown accidents caused by the malfunction of the generator backup over speed protection caused by interference.The principle of frequency converter interference,the cause of generator backup over speed and misoperation were analyzed.Some measures were proposed to prevent interference.