独立交流供电系统中传导干扰的预测研究

提出了一种利用端口等效概念预测传导干扰的方法.该方法只需进行简单的分析迭加,就能有效预测系统级的传导干扰.以常见的三相晶闸管(SCR)整流桥为例,分析了整流桥产生差模传导干扰的机理;计算了当独立供电系统中存在多个非线性负载时电网侧的传导干扰.通过对计算结果与实验结果的比较,证明了该计算方法的有效性.由此可知,相对以往的仿真分析,该方法的计算时间更短,更容易推广到独立供电系统的EMI预测中去.

Prediction of the Conducted Interference in the Isolated AC-Supply System

With the development of the power electronics,the EMI generated by the power electronics become more and more serious,especially in ship.The EMI must be predicted first to reduce the interference.However,present method all have disadvantages for these isolated power supply system.Based on the operating principle of the three-phase rectifier, the calculation equations of different mode EMI are obtained in the frequency-domain.Using these equations,the EMI generated by multiple rectifiers can also be calculated easily.At last,the calculated results are verified by the experiment results.Compared with the simulation, the proposed method is less time consuming and can be easily used for predicting the EMI in isolated power supply system.