矿山电机与变频器干扰特性分析

Analysis of frequency converter interference features and mining motor

对矿山电机和连入电力线的变频器进行分析,并研究电机和变频器的干扰特性。从同步、异步电机工作原理出发,说明电机启动时的大电流对电力线产生的冲击和影响,讨论了在煤矿上普遍使用的变频器产生干扰的原因,针对其中的电力电子开关等非线性器件产生谐波的问题,讨论了变频器等效阻抗的特性,并对多重化整流技术进行了输入谐波分析,得出不同情况下影响较大的谐波阶次。

Mining motor and frequency converter interference connected to power line as well as its features were analyzed. The impact and influence of high current on power line when started motor were explained through working principles of synchronous and asynchronous motor, meanwhile, reasons of inverte widely used in coal mine were discussed. Based on existing problems of harmonic generation in power electronic switches and other nonlinear devices, characteristics of equivalent impedance of frequency converter were discussed, and input harmonic analysis was made to multiple rectifying technology, which obtained influence of harmonic order under different conditions.