基于基波谐振原理的无源滤波新方法研究

A Research on New Passive Filter Method Based on Principle of Fundamental Resonance

非线性负载的增多导致了电力系统的谐波污染日益严重。针对有源滤波器的初期投资大,结构复杂,运行维护困难的缺点,提出一种无源滤波新方法,该方法在电网与无源滤波器之间三相线路中分别串联一组由电感和电容组合而成的基波谐振电路,该电路对基波电流无影响,但是对谐波电流呈现了高阻抗的特性,可以迫使谐波电流最大限度的流入无源滤波器,从而大幅度的提升滤波器的效率。对该新方法通过建立等值电路进行了滤波原理分析,与传统无源滤波方法进行了滤波效能比较,并分别通过单相和三相电路滤波实验进行验证,实验结果表明该方法与传统无源滤波器相比有较佳的滤波效果。

Nonlinear loads increasing brought more and more serious harmonic pollution.In view of defects of active filter of big initial investment,complicated structure and difficult to operation and maintenance,a new passive filter method was presented.The method was that fundamental resonance circuit made up of inductance and capacitance was connected in three-phase circuit between power grids and passive filter.The circuit didn′t affect fundamental circuit,but took on characteristics of high-impedance of harmonic circuit,and could compel harmonic circuit to flow into passive filter by the greatest extent so as to promote filter efficiency by a large margin.This new method had made a filter principle analysis by setting up equivalent circuit comparing with traditional passive filter method,and had been verified by single-phase and three-phase circuit filter experiment.The result indicated that the method had a better filter effect and broad application prospect than traditional passive filter.