APF直流侧电压控制小信号建模及参数整定

DC-side Voltage Controlled Small-signal Modeling and Parameter Tuning for APF

直流侧电压控制是并联型有源滤波器APF(active power filter)的关键环节,精确设计控制器参数有助于提高系统性能。在传统直流侧电压控制模型基础上建立了其控制小信号模型,进而提出一种基于小信号模型的PI参数整定方法。采用零极点配置将含有右半平面零点的小信号模型转化为普通的二阶滞后系统,根据劳斯判据和两步整定法详细讨论了PI参数的选取原则,重点分析不同PI参数对系统性能的影响。该方法在实验参数已知的情况下,可以准确计算出PI控制器参数,在保证系统谐波补偿性能的同时具有较小的直流侧电压超调。仿真和样机实验结果都表明了该方法的可行性。

DC-side voltage control is the key link of shunt active power filter(APF),and a precise design of contro-ller parameters is helpful to the improvement of system performance.Based on the traditional DC-side voltage control model,a small-signal model is established,and a PI parameter tuning method is proposed accordingly.With zero-pole configuration,the small-signal model including right-half plane zero is changed into an ordinary two-order delay system.The selection principle of PI parameters is discussed in detail according to the Routh-criterion and two-step tuning method,and the impact of different PI parameters on the system performance is analyzed specifically.This method can precisely calculate the PI controller parameters when platform parameters are given,and the DC-side voltage can maintain a smaller overshoot while ensuring the system’s harmonic compensation performance.Simulation and experimental results of a prototype verified the feasibility of this method.