注入式混合型有源电力滤波器稳定性研究

Study on stability of injection type hybrid active power filter

在介绍注入式混合型有源电力滤波器的拓扑结构及控制策略的基础上,提出了该有源电力滤波器的数学模型,并利用该模型对系统的稳定性进行深入分析。从谐波抑制效果出发,有源电力滤波器放大倍数K的取值越大越好;但是系统中的延时环节、电网电感参数和无源电力滤波器参数均限制了K的取值范围,从而共同决定了有源电力滤波器实际能够投入的最大容量。分析表明:系统中的延时越小、无源电力滤波器及电网的电感参数越大,则最大放大倍数Kmax越大,谐波抑制效果越好;无源部分对Kmax影响有限。实验结果证明了理论分析的正确性。

Based on the introduction of its topology and control strategy,the mathematical model of injection type hybrid APF（Active Power Filter） is proposed,with which the system stability is analyzed. For better harmonic suppression,APF amplification multiple K should be bigger,but it is restricted by system time delay,network inductance and passive power filter parameters. The possible maximal capacity of APF is thus determined jointly. The analysis shows that,the smaller the time delay is and the larger the network inductance and passive power filter parameters are,the larger the Kmax（maximal value of K） will be and the better the harmonic suppression performance will be. Moreover,the effect of the passive part on Kmax is limited. Experiments testify the correctness of the theoretical analysis.