一种电流跟踪误差补偿的三相有源电力滤波器的无差拍控制方法

A Control Method Based on Current Tracking Error Compensation of Deadbeat Control for a Three-phase Active Power Filter

首先介绍三相有源电力滤波器(active power filter,APF)在abc轴系下的连续时间数学模型,并采用后向差分的方法得到在??轴系下的离散化数学模型。对于电流内环,采用无差拍控制(deadbeat control,DBC)方法实现谐波电流的跟踪。为了解决DBC的延时补偿问题,采用"两步预测"的方法预测给定电流。特别地,针对待补偿电流变化显著的时间区域提出一种电流跟踪误差补偿的方法消除网侧电流的"上凸"和"下凹"的现象。同时,采用电流校正算法抑制采样误差对电流产生的影响。最后,搭建三相APF的实验平台,验证所提出控制方法的有效性。

The continue time mathematical model of a three-phase active power filter （APF） in the abc flame was introduced firstly. And then, the mathematical model was discretized by backward difference in the aft flame. For an inner current loop, the deadbeat control （DBC） method was adopted to track the reference harmonic currents. In order to solve the problem of delay compensation in DBC, a two-step prediction was used to predict the reference current. Specifically, for the dramatic changing region of the compensated current, a current-tracking error compensation method was proposed to eliminate the upper convex and lower concave phenomena in grid side currents. Meanwhile, in order to suppress the influence on grid currents caused by sampling errors, a current correction algorithm was proposed to solve this problem.＇ Finally, the experimental setup of a three-phase APF was built, and then the effectiveness of this method was verified by experiments.