电压源PWM变频器驱动系统负面效应及其对策研究

变频器在工农业，国防等领域做出了臣大的贡献的同时，也产生了显著的负面效应。现代电力电子器件的飞速发展，功率开关器件的快速导通或关断特性将使逆变器的输出产生很高的dv／dr。dv／dr过高将对变频器驱动系统产生一系列危害，如增大了电机内部的功率损耗；加快了电机轴承的损坏速度；对电源产生强烈的电磁干扰；还会引起电机保护电路的误动作；当电机和变频器之间不可避免地采用长线电缆连接时，还会在电机端出现过电压现象，这种现象不但使上述负面影响进一步恶化，还使电机绝缘提早老化，甚至被击穿，缩短了电机的使用寿命。本文分析了变频器输出负面效应产生的本质，对减小或消除这些危害所采取的不同方案进行了评价，提出了一种新颖的消除这些危害的有效方案。

Research on Side-Effects of Voltage Source PWM Inverter Drive System

Converter makes great contribution to industry and agriculture, but it brings noticeable negative influence at the same time. With the development of modern power device, its switching frequency increases at very fast speed, which will produce high dv/dt. High dv/dt may damage drive system of converter. This paper analyzes the essence of its negative influence and evaluates various solutions to handle it, then presents a new and practical method to eliminate it.