By establishing a non-inductive load filter capacitor current AC-DC switching circuit, the output lags the system voltage by 1/4 cycle of SPWM frequency control method and system to make inductive load energy exchange occurs, to replace the capacitor compensation system inductance inductive successful results. And through the Y/A three-phase transformer connected with the work of the single-phase compensation circuit, eliminating the larger single-phase compensation circuit of 3 harmonics, make compensation circuit excluding low-order harmonic. Based on this principle, a kind of reactive power compensation in power system of power capacitor using inductively instead of control method was proposed, and studies the reactive power compensation device parameters design. To reactive power compensator capacity and voltage, by reducing the impact of the current power capacitor, improving the working reliability and reduce the cost of equipment. Using the circuit simulation software, the compensation effect was tested, and the compensation method was demonstrated.%通过建立一个不含滤波电容的电感负载交直交换流电路,利用输出滞后系统电压1/4工频周期的SPWM控制方法,使电感负载与系统感性负载发生能量交换,达到电感代替电容补偿系统感性无功的效果.并通过Y/△三相变压器连接3个配合工作的单相补偿电路,消去单相补偿电路中较大的3次谐波,使三相补偿电路不含低次谐波.基于该原理,提出一种在电力系统无功补偿中利用电感代替功率电容的控制方法,并研究该无功补偿装置的参数设计.有利于无功补偿器容量和电压的提升,减少由功率电容带来的冲击电流,提高了工作可靠性和降低了设备成本.用仿真软件建立算例电路检验补偿效果,并论证了补偿方法.
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