在瞬时功率理论的基础上提出了一种基于带通滤波器的指定次谐波检测方法。文章建立在所提出有源电力滤波器的拓扑结构及其数学模型基础上,对电网中的单次谐波和间次谐波补偿方法进行研究。该方法新颖,物理意义明确,可以针对任意次谐波进行补偿,进而为电路参数的设计提供了方便。针对APF的负序谐波设计了一种8阶IIR数字滤波器,并对该滤波器进行了仿真分析,提出了一种数字滤波的实现方案。对APF的仿真和实验结果证实了该方法的正确性。
In this paper,a new harmonic detection method based on the specified band-pass filter is presented.The whole method is based on instantaneous power theory.On the basis of established active power filter topological structure in paper proposed and its mathematical model in the grid,this article studies on single frequency harmonics and inter-harmonics compensation method.The approach is novel,clear physical meaning and any harmonic can be compensated by it,and it is convenient for circuit parameters design.Aiming at the negative sequence APF harmonic a kind of 8 order IIR digital filter is designed out,and the filter is simulated,and then a kind of digital filter scheme is put out.The simulation results of APF confirm the validity of this method.