Feature Analysis for Transient Overvoltage in Offshore Wind Farm Based on High and Low Frequency Energy Rate Using Multi-scale Mathematical Morphology

被引：0

作者：

Gu Y. ^{[1
]}

Tang W. ^{[1
]}

Xin Y. ^{[1
]}

Zhou J. ^{[1
]}

Wu Q. ^{[1
]}

机构：

[1] School of Electric Power Engineering, South China University of Technology, Guangzhou

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2021年 / 41卷 / 05期

基金：

中国国家自然科学基金;

关键词：

High and low frequency energy; Internal transient overvoltage; Multi-scale mathematical morphology; Offshore wind farm;

D O I：

10.13334/j.0258-8013.pcsee.191869

中图分类号：

学科分类号：

摘要：

At present, the high-frequency transient overvoltage caused by the frequent operations on electrical equipment or faults in offshore wind farms, is particularly severe. In order to analyze the transient characteristics of internal overvoltage in offshore wind farms, this paper firstly proposed a signal feature extraction method based on mathematical morphology, constructing a new morphological structure operator and utilizing multi-scale mathematical morphological decomposition to extract the high and low frequency information of transient overvoltage. Then two time-domain identification feature indexes were constructed for identifying the type of transient overvoltage in offshore wind farms. Finally, based on the high frequency feature index and the high and low frequency energy rate feature index proposed by this paper, different types of internal transient overvoltage classification could be classified using the support vector machine classifier model. The results show that compared with the traditional Wavelet algorithm, the feature extracted by the proposed mathematical morphology algorithm had a clearer degree of discrimination, which could accurately identify the overvoltage types, laying a foundation for the protection setting and insulation coordination for the electrical equipment in the offshore wind farm substations. © 2021 Chin. Soc. for Elec. Eng.

引用

页码：1702 / 1712

页数：10

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