一种三相交流调压电路——三相Y接对称性负载脉宽调压电路

A three-phase AC adjustable-voltage circuit——pulse-width adjustable-voltage circuit with three-phase symmetrical Y connection

提出了一种仅针对三相Y型接法对称性负载的调压电路———脉宽调压电路,此调压电路使用一只可关断电力电子器件对三相Y型接法对称性负载进行调压控制。分析了工作原理,给出了实验结果。结果表明:对Y型接法的三相对称性负载采用此方法调压能使系统的电路结构简单、负载上的电压谐波分量小,系统响应快。可适用于Y型接法的三相感应电动机调压调速、三相Y接电阻炉调温控制等负载的应用中。

The paper presents the pulse-width adjustable-voltage circuit, which aims at three-phase Y connection symmetrical load and uses a switchable power electronic components to realize the adjustable-voltage control for the three-phase Y connection of symmetrical load. The working principle is analysed and the experimental result is given which shows that it makes circuit simple, voltage harmonic components few, and response quick. It can be applied to voltage and speed adjustment of three-phase induction-motor, temperature-adjusting control of electric stove with three-phase Y connection and so on.