直接电流控制的静止无功发生器的研究

Research on SVG Control Policy Based on Direct-Current Control

分析了采用三相桥式电路的静止无功发生器(SVG)的运行原理。指出SVG发出纯容性无功功率时电容两端电压过高的原因及其解决的方法,采用了具有电压环和电流环的直接电流法控制SVG,针对电压环PI调节超调量容易过大的不足提出了PID控制,电流环采用PI调节,给出了参数的整合方法。通过MATLAB仿真给出了系统发出感性和容性无功时电流和电容两端电压的仿真波形,验证了系统的原理及设计思想。

This paper introduces the operating principle of three-phase bridged SVG. It points out the causes and solutions of the high voltage on the capacitor when it issues the capacitive reactive power. The direct current control , containing double closed-loop, is used to reduce the voltage on the capacitor. As to the disadvantage of the overshoot of PI controller,this article proposes PID controller for voltage closed loop and PI controller for current closed loop as a feasible solution. This method has been verified by MATLAB when the SVG issues the capacitive and inductive reactive power, thus satisfied the principle and the design philosophy of the SVG.