本文论述了电力系统无功功率的产生及影响。从电路结构上分析了晶闸管投切电容器(TSC)的工作原理,设计并建立了TSC的主电路和控制触发系统。在TSC控制策略方面,采用初始脉冲和后续脉冲叠加的控制方法。实验系统运行结果表明,电容器投入无涌流,无暂态过程。 This paper discusses the generation and impact of reactive power in power system. The working principle of thyristor switched capacitor (TSC) is analyzed from the circuit structure, and the main circuit and control triggering system of TSC are designed and established. In the control strategy of TSC, the control method of initial pulse and subsequent pulse superposition is adopted. Experimental results show that the system, the capacitor into no current, no transient process.