High proportion and large value harmonic current influence on the magnetic field, loss and temperature distribution for ultrahigh voltage converter transformer

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-10-18 DOI:10.1049/elp2.12382

Cong Liu, Jian Hao, Ruijin Liao, Fan Yang, Wenping Li, Zhiwei Li

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Abstract

The temperature distribution of ultrahigh voltage (UHV) converter transformer is the key to its service life, allowable load and safe operation. The influence of a high-proportion and large-value harmonic current on the magnetic field, loss and temperature distribution of a UHV converter transformer is studied. A new calculation method is proposed to determine the winding temperature under the combined actions of multiple key factors. First, the skin effect of UHV converter transformer winding under high proportion and high current harmonics is analysed extensively. It is found that the increase of harmonic current frequency leads to exponential increase of winding loss and temperature by changing skin depth. Second, based on the superposition principle, a calculation method for winding loss considering harmonic current and different load rates is developed. The temperature distribution under different harmonic current frequencies and contents is obtained. The winding losses and temperature under different harmonic currents are quantified. Finally, a new calculation method is proposed for the converter transformer winding temperature, considering the combined actions of factors such as load rate, cooling oil inlet rate and temperature, harmonic current frequency and content. Experimental verification showed an error of only 0.58 K in the actual transformer hotspot temperature, confirming the effectiveness of this method. This method is of great significance for temperature control and safe operation of UHV converter transformers.

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高比例、大数值谐波电流对特高压换流变压器磁场、损耗和温度分布的影响

特高压（UHV）换流变压器的温度分布是其使用寿命、允许负载和安全运行的关键。本文研究了高比例、大数值谐波电流对特高压换流变压器磁场、损耗和温度分布的影响。提出了一种新的计算方法，以确定多种关键因素综合作用下的绕组温度。首先，广泛分析了特高压换流变压器绕组在高比例和高电流谐波下的集肤效应。研究发现，谐波电流频率的增加会通过集肤深度的变化导致绕组损耗和温度的指数增加。其次，基于叠加原理，开发了一种考虑谐波电流和不同负载率的绕组损耗计算方法。得出了不同谐波电流频率和含量下的温度分布。量化了不同谐波电流下的绕组损耗和温度。最后，考虑到负载率、冷却油入口率和温度、谐波电流频率和含量等因素的综合作用，提出了一种新的变流器变压器绕组温度计算方法。实验验证表明，实际变压器热点温度误差仅为 0.58 K，证实了该方法的有效性。该方法对特高压换流变压器的温度控制和安全运行具有重要意义。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.