Time-domain harmonic source location and evaluation methods based on non-linear and time-varying properties of devices

IF 2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Chenhao Zhang, Yang Li, Wei Han, Guobing Song, Hua Zhang
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引用次数: 0

Abstract

Most of the existing methods for harmonic analysis are from frequency-domain perspective. In fact, the essential factor for generating harmonics is non-linear characteristic or time-varying property. Therefore, the harmonic generation mechanism and the harmonic source location method are investigated from the time domain perspective in this paper. Firstly, a general model of non-harmonic sources is established. The non-harmonic sources will match well with the proposed general model while the harmonic source will not. Then correlation coefficient that reflects compliance degree between each device and the general model is defined for distinguishing harmonic sources from non-harmonic sources. On this basis, a novel time-domain harmonic source location method is proposed. Numerous simulations and experiments have demonstrated that the proposed method has good performance under fluctuations, saturations, pre-distortions, transient process, and resonances. The defined correlation coefficient can reflect non-linearity/time-varying degree of the harmonic source, which can be used for evaluating harmonic emission level of each harmonic source. On this basis, a simple harmonic responsibility division method is proposed, which is immune to possible fluctuations, pre-distortions, saturations, resonances, and impedance variation.

Abstract Image

基于设备非线性和时变特性的时域谐波源定位和评估方法
现有的谐波分析方法大多是从频域角度出发的。事实上,产生谐波的基本因素是非线性特性或时变特性。因此,本文从时域角度研究了谐波产生机理和谐波源定位方法。首先,建立非谐波源的一般模型。非谐波源与提出的一般模型非常吻合,而谐波源则不吻合。然后,为区分谐波源和非谐波源,定义了反映每个设备与一般模型之间符合程度的相关系数。在此基础上,提出了一种新颖的时域谐波源定位方法。大量的仿真和实验证明,所提出的方法在波动、饱和、预阻抗、瞬态过程和共振等情况下都具有良好的性能。定义的相关系数能反映谐波源的非线性/时变程度,可用于评估各谐波源的谐波发射水平。在此基础上,提出了一种简单的谐波责任划分方法,该方法不受可能出现的波动、前阻抗、饱和、谐振和阻抗变化的影响。
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来源期刊
Iet Generation Transmission & Distribution
Iet Generation Transmission & Distribution 工程技术-工程:电子与电气
CiteScore
6.10
自引率
12.00%
发文量
301
审稿时长
5.4 months
期刊介绍: IET Generation, Transmission & Distribution is intended as a forum for the publication and discussion of current practice and future developments in electric power generation, transmission and distribution. Practical papers in which examples of good present practice can be described and disseminated are particularly sought. Papers of high technical merit relying on mathematical arguments and computation will be considered, but authors are asked to relegate, as far as possible, the details of analysis to an appendix. The scope of IET Generation, Transmission & Distribution includes the following: Design of transmission and distribution systems Operation and control of power generation Power system management, planning and economics Power system operation, protection and control Power system measurement and modelling Computer applications and computational intelligence in power flexible AC or DC transmission systems Special Issues. Current Call for papers: Next Generation of Synchrophasor-based Power System Monitoring, Operation and Control - https://digital-library.theiet.org/files/IET_GTD_CFP_NGSPSMOC.pdf
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