有源滤波器直流侧电压闭环控制的稳定性研究

Stability Research on D. C Voltage Close Loop Control for an Active Power Filter

分析了三相系统中无功电流和谐波电流瞬时功率的性质。从有源电力滤波器交直流侧瞬时功率平衡方程的角度出发，推导了关于小信号扰动的近似等效的数学模型，获得了在比例控制和比例积分控制下的稳定性判据。最后用计算机仿真验证了理论分析的正确性。

A nalyses is given to the characteristics of the instantaneous power produced by reactive and harmonic currents in a three-pbase AC system。 According to the instantaneous power balance equation between AC and DC side of an active power filter,the approximate equivalant mathematical model to small signal porturbation ls derived,and stability criterion under the condition of proportional control and proportional-integral control is obtained.The validity of theoveticalanalysis is verified by compiter simulation.