• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2016, Vol. 37 ›› Issue (7): 126-132.doi: 10.3969/j.issn.1000-7229.2016.07.018

• 输配电技术 • 上一篇    下一篇

特高压直流输电系统异常换相失败的机理研究

金祖洋,杨洪耕,赵海杉   

  1. 四川大学电气信息学院,成都市 610065
  • 出版日期:2016-07-01
  • 作者简介:金祖洋(1992),男,硕士研究生,研究方向为电力谐波分析; 杨洪耕(1949),男,教授,博士生导师,研究方向为电能质量、无功电压控制、智能电网; 赵海杉(1992),男,硕士研究生,研究方向为电力谐波分析。

Abnormal Commutation Failure Mechanism in UHVDC Transmission System

JIN Zuyang, YANG Honggeng, ZHAO Haishan   

  1. School of Electrical Engineering and Information, Sichuan University, Chengdu 610065, China
  • Online:2016-07-01

摘要: 针对特高压直流输电系统故障恢复过程中出现的换相失败,无法利用换相电压降低或直流电流上升进行解释的异常现象,考虑换相电压波形畸变的影响,提出了一种基于谐波分解与换相电压时间面积的换相失败分析方法。该方法通过畸变换相电压的各次谐波最大可能换相面积的正负和大小,定性和定量分析其对换相失败的影响。考虑到谐波相位的不确定性,提出谐波风险系数作为评价谐波促进换相失败的最大风险指标。应用所提方法分析了某特高压直流输电系统故障恢复过程中出现的异常换相失败现象,结果说明了引起换相电压波形畸变的原因,揭示了主要谐波对换相失败促进或抑制的影响程度及其风险性,验证了方法的有效性。

关键词: 特高压直流输电系统, 异常换相失败, 直流偏磁, 谐波分解, 换相电压时间面积, 谐波风险系数

Abstract: In allusion to the abnormal phenomenon that commutation failure occurred in the fault recovery process of UHVDC transmission system cannot be explained by commutation voltage reduction or DC current rising, this paper proposes a method for commutation failure analysis based on harmonic decomposition and commutation voltage-time area, with considering the influence of commutation voltage waveform distortion. The method can qualitatively and quantitatively analyze the influence of harmonic voltage on commutation failure through the nature and size of every maximum possible harmonic commutation voltage-time area of distorted commutation voltage. Noting the uncertainty of harmonic phase, we use the harmonic risk coefficientas the maximum risk index to evaluate harmonic to promote commutation failure. Then we adopt the proposed methodto analyze the abnormal commutation failure occurred in the fault recovery process of a UHVDC system.The results show the cause of commutation voltage waveform distortion, reveal the stimulative or inhibited influence degree and risk of the main harmonic on commutation failure, and confirm the effectiveness of the method.

Key words: UHVDC transmission system, abnormal commutation failure, DC-bias, harmonic decomposition, commutation voltage-time area, harmonic risk coefficient

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