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分析了有源电力滤波器(APF)的数学模型以及直流侧电容电压的控制方法。针对传统的PI调节和三段式调节直流侧电压的方法存在超调过大和控制方法复杂的问题,设计了一种阶梯式控制直流电压的PI调节器。从系统启动到稳定运行过程中,直流侧电压给定值由初始给定值阶梯状上升到最后稳定时的给定值,上升过程中采用PI调节器对给定电压进行跟踪。
The mathematical model of active power filter (APF) and the control method of DC capacitor voltage are analyzed. Aiming at the problems of traditional PI regulation and three-stage regulation of DC voltage, there is a problem that the overshoot is too large and the control method is complicated. A step-by-step PI regulator for controlling DC voltage is designed. From system startup to steady operation, the DC voltage reference rises from the initial reference value to the reference value at the final stabilization, and the PI regulator is used to track the given voltage during the rising process.