基于串联补偿的间谐波抑制技术研究

Research of Inter-harmonics Suppression Technology Based on Series Compensation

随着非线性负荷的增多和电力电子技术在电网中的广泛应用,近年来电网中出现大量的谐波和频谱分散的间谐波。间谐波除了具有谐波的危害之外,还造成其他严重危害,如引起电压波动和闪变等。目前国内对间谐波的研究还在性质分析和检测算法阶段,还没有可靠有效的抑制措施。文中提出一种基于串联补偿的间谐波抑制技术,并对电弧炉产生的电压波动和闪变抑制情况进行仿真分析,证明其成为抑制间谐波的有效手段。首先介绍间谐波引起的电压波动特性,然后介绍串联补偿原理及构成,最后在SIMULINK环境下建立串联电压补偿器模型和电弧炉模型,通过仿真验证串联电压补偿器对间谐波的抑制作用。

With the increase of non-linear loads and widely usage of power electronic technology in power grid, there have been a large number of harmonics and spread spectrum inter-harmonics in the grid recently. Inter-harmonics have caused more serious hazards than harmonics, such as voltage fluctuation and flicker. Studies of inter-harmonic are still at the stage of characteristic analysis and detective algorithm, without reliable and effective suppression method. This article presents a harmonic suppression technology based on a series of compensation, conducting simulations to demonstrate its effectiveness to suppress the inter-harmonic. The characteristic of voltage fluctuation caused by harmonic is first introduced; then the principle and structure of series compensation are pointed out; finally, by modeling and simulation, series voltage compensator is proved effective to suppress inter-harmonics.