配电网中谐波源定位方法综述

监测和治理电力系统中非线性负荷产生的大量谐波需检测谐波源并确定其位置,但目前谐波源模型过于简单,尤其实际谐波责任区分问题需要解决,为此综述了谐波源定位的各种方法,包括基于谐波功率潮流方向和谐波阻抗的检测方法,并总结了谐波功率潮流法应用的局限性及其与谐波功率相关的其他方法,归纳了基于判断谐波阻抗的4种方法,指出了波动量法和线性回归法是较有实用价值的方法,分别说明了各种谐波源定位方法的优点和不足之处。最后介绍了基于人工神经网络的识别方法和参考阻抗法及其对这些方法的改进,表明解决谐波源问题的关键是建立统一的标准和理论,分析了谐波源定位研究的发展方向并指出其工程应用有待解决。

Methods for Localizing the Harmonic Source in Power Distribution Network

Electronics devices are nonlinear and thus they create distorted currents even supplied with purely sinusoidal voltage.Correct identification of harmonic source locations is essential for determining the responsibility mitigation means and for determining the responsibility of the parties involved.For the harmonic detection and harmonic control,the detection and localization of harmonic source at the point of common coupling(PCC) become more and more important.Since proposing the incentive scheme,many researchers put forward many localization methods.This article summarizes the methods of identifying the harmonic source including the Power-Direction Method and harmonic impedance method,and points out that the power direction method is theoretically incorrect and should not be used to determine harmonic source locations.The Neural-Network-Based Signature Recognition method and reference impedance method are introduced,and the advantages and disadvantages of the methods are presented.It is indicated that combination of artificial neural networks and fuzzy methods should be researched for the circuit analysis of electrical power systems.The necessity to propose an incentive-based scheme for limiting the harmonic pollution is presented.At last authors summarize the direction of this research,the key of the localization the harmonic source is to establish the uniform standard and applied in project.It is found that there are still many unsolved problems in this field.