晶闸管投切电容无功补偿角型接线方案的研究

Study on Schemes Suitable for Thyritors Switching of Three-phase Delta-connected Capacitor Banks

对于三相平衡负载的无功补偿 ,提出了晶闸管投切电容无功补偿角型接线的两种新的经济型方案。第一种采用晶闸管的反并联 ,第二种利用晶闸管和二极管的反并联。相对于常规的接线方案 ,新方案则要显得更加经济且能够快速地控制电容器组的投入和切除。

Delta connected capacitor banks are used for power factor improvement of balanced three phase loads(e g.,thr ee phase induction motors,etc.)and are normally switched in and out using antiparallel thyristors.This paper describes two novel schemes for thyristors switching delta connected capacitor banks.While the first scheme is composed of antiparallel thyristors,the second scheme takes full advantage of anti parallel combination of diode and thyristor.Compared with the existing scheme,these two novel schemes are more economical,moreover,both of them can switch delta connected capacitor banks in and out very quickly and,hence,is suitable for static var compensator (SVC)application.