有源电力滤波器的双环软启动控制分析研究

针对并联型有源电力滤波器(APF)投入电网时,启动时的直流侧电容电压,补偿端电流冲击问题,提出了双闭环的软启动的控制策略。其中在电压外环采用一种直流侧输出电压偏差平方值的模糊-PI的新型PI控制方法,以更加精确地平稳缓冲启动电容电压。而在电流内环采用比例谐振(PR)控制方法,且运用了一种改进的谐波检测方法。最后在软件MATLAB中进行了仿真验证,且将该方法在60 kVA的实验样机上测试了可行性。通过与常规控制算法对比,说明该方法在APF启动并网时,在其抑制冲击电压和冲击电流端起到了良好的控制效果,具有良好的工程应用价值前景。

Analysis research on double loop soft start control of active power filter

For paralleled active power filter (APF) into the power grid, the control strategy of double closed loop soft start is proposed to solve the problem that the capacitor voltage of DC side is started and the current impact of compensation end is presented.The new PI fuzzy-PI control method adopting a DC output voltage deviation square values ring in the outer voltage is used for more accurate and stable buffer starting the capacitor voltage.The proportional resonant (PR) control method is used in the current loop, and an improved harmonic detection method is also used.Finally, a simulation experiment is carried out in the MATLAB software, and the method is used to test the feasibility of the 60 kVA prototype.Comparing with the conventional control algorithm, the method obtaines better control result on the inhibition of impulse voltage and impulse current end in the APF grid, it has good prospects for engineering applications.