华南理工大学学报(自然科学版) ›› 2017, Vol. 45 ›› Issue (4): 1-7.doi: 10.3969/j.issn.1000-565X.2017.04.001

• 动力与电气工程 •    下一篇

高压直流系统无功动态对暂态电压稳定的影响

蔡泽祥1 冯雷1 杨欢欢1 朱林1 张东辉2 周保荣2   

  1. 1. 华南理工大学 电力学院,广东 广州 510640; 2. 南方电网科学研究院,广东 广州 510080
  • 收稿日期:2016-05-16 修回日期:2016-11-16 出版日期:2017-04-25 发布日期:2017-03-01
  • 通信作者: 蔡泽祥( 1960-) ,男,教授,博士生导师,主要从事电力系统保护、控制与自动化研究. E-mail:epzxcai@scut.edu.cn
  • 作者简介:蔡泽祥( 1960-) ,男,教授,博士生导师,主要从事电力系统保护、控制与自动化研究.
  • 基金资助:

    国家自然科学基金资助项目( 51407079)

Influence of Reactive Power Dynamics of HVDC System on Short-Term Voltage Stability

CAI Ze-xiang1 FENG Lei1 YANG Huan-huan1 ZHU Lin1 ZHANG Dong-hui2 ZHOU Bao-rong2   

  1. 1.School of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Electric Power Research Institute of China Southern Power Grid,Guangzhou 510080,Guangdong,China
  • Received:2016-05-16 Revised:2016-11-16 Online:2017-04-25 Published:2017-03-01
  • Contact: 蔡泽祥( 1960-) ,男,教授,博士生导师,主要从事电力系统保护、控制与自动化研究. E-mail:epzxcai@scut.edu.cn
  • About author:蔡泽祥( 1960-) ,男,教授,博士生导师,主要从事电力系统保护、控制与自动化研究.
  • Supported by:
    Supported by the National Natural Science Foundation of China( 51407079)

摘要: 采用直流系统准稳态模型解析故障后高压直流输电系统无功的时域变化规律, 并通过仿真深入分析其动态变化幅值和时间特性. 通过对比分析考虑直流影响和不考虑 直流影响两种情况,阐述了故障后直流系统无功动态对感应电动机无功恢复产生的延缓 效应,揭示了直流系统无功动态影响暂态电压稳定的机理和途径. 最后提出以感应电动机 临界滑差变化率作为评估直流系统对暂态电压稳定影响的指标,并结合南方电网实际系 统进行了验证.

关键词: 高压直流输电, 无功动态特性, 暂态电压稳定, 评估指标

Abstract:

In this paper,first,the post-fault HVDC ( High-Voltage Direct Current Transmission) reactive power change laws in time domain are analyzed by using the quasi-steady model of HVDC system.Next,the amplitude and time features of reactive power change are explored through simulation.Then,by comparatively analyzing the reactive power change with or without HVDC,the reactive power recovery delaying effect that HVDC reactive power dynamics exert on the induction motor is illustrated,and the mechanism and pathway by which HVDC reactive power dynamics influence the short-term voltage stability are explored.Finally,an index,namely the change rate of critical slip of induction motor,is proposed to evaluate the influence of HVDC reactive power dynamics on the short-term voltage stability,and the effectiveness of the proposed method is verified by an application example on China Southern Power Grid.

Key words: high-voltage direct current transmission, reactive power dynamic characteristic, short-term voltage stability, evaluation index