三相四线制下串联混合型滤波器的研究

提出一种应用于三相四线制的串联混合型滤波器结构及相应的基波电流控制策略，无需对谐波进行检测，且可使有源滤波器对各次谐波电流呈较大的阻抗，而对流过的基波电流无影响。同时设计了负反馈控制电路，解决了系统的稳定性问题。阐述了串联混合型滤波器的滤波原理与控制方法。应用MATLAB软件对三相四线制电力系统进行了仿真研究，结果表明所提出的控制策略是正确的。整套装置具有结构简单、检测方便、滤波效果好、系统稳定的优点。

STUDY ON SERIES HYBRID ACTIVE POWER FILTER IN A THREE-PHASE FOUR-WIRE SYSTEM

This paper presents a topology of series hybrid active power filter (SHAFP) applied to a three-phase four-wire power system and the associated fundamental current control strategy. The proposed method does not need to process harmonic current in detection circuit and can make active power filter to exhibit high impedance to harmonics, while imposing no influence on fundamental current. To achieve stability control, negative feedback circuits are designed. Filtering principle and control methods are discussed. Simulation results with nonlinear load in three-phase four-wire balanced system show that the proposed control strategy is correct. The designed SHAPF is simple in configuration, convenient in detection and provides excellent filtering performance and good system stability.