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基于模量相平面的柔性直流电网T接线路故障识别方法
作者:
作者单位:

输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市 400044

摘要:

含T接线路的柔性直流电网由于仅在送端和受端安装直流断路器,发生区内故障时各端的直流断路器均需断开,与双端直流相比,其故障电流特征更加复杂,常规的直流电网保护方法无法直接应用。为满足含T接线路的柔性直流电网对保护的高要求,文中提出了一种基于模量相平面的柔性直流线路故障识别方法。首先,研究网络拓扑结构,基于换流器闭锁前区内外故障等效电路,推导故障电流模量特征。然后,结合故障位置及类型,对保护动作原则和阈值整定进行分析;同时通过构造阈值缩比因子,实现保护的自适应整定。最后,在PSCAD/EMTDC平台中建立含T接线路的柔性直流电网仿真模型,验证了所提方法的快速性和可靠性。该方法算法简单、计算量小,仅利用单端信息快速识别故障且抗系统扰动能力强。

关键词:

基金项目:

国家重点研发计划资助项目(2018YFB0904600)。

通信作者:

作者简介:

王强钢(1987—),男,副教授,博士生导师,主要研究方向:电力系统保护与控制、电能质量等。E-mail:qianggang1987@cqu.edu.cn
倪静怡(1996—),女,通信作者,硕士研究生,主要研究方向:柔性直流电网故障保护与控制等。E-mail:1063738532@qq.com
廖建权(1994—),男,博士研究生,主要研究方向:柔性直流电网故障保护与控制、直流配电网电能质量等。E-mail:jquanliao@cqu.edu.cn


Fault Identification Method for Teed Lines of Flexible DC Power Grid Based on Modulus Phase Plane
Author:
Affiliation:

State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University), Chongqing 400044, China

Abstract:

Since the flexible DC power grid with teed lines is only installed with DC circuit breakers (DCCBs) at the sending and receiving ends, the DCCBs at each end need to be disconnected when an internal fault occurs. Compared with the double-terminal DC power grid, its fault current characteristics are more complicated, and conventional DC power grid protection methods cannot be directly applied. In order to meet the high protection requirements of the flexible DC power grid with teed lines, a fault identification method based on modulus phase plane for flexible DC lines is proposed in the paper. Firstly, the network topology is studied, and based on the equivalent circuit of internal and external faults before the converter is blocked, the characteristics of fault current modulus are derived. Then, combined with fault locations and types, the protection operation principle and threshold setting are analyzed. At the same time, the adaptive setting of protection is realized by constructing a threshold scaling factor. Finally, the simulation model of the flexible DC power grid with teed lines is established in PSCAD/EMTDC platform to verify the rapidity and reliability of the proposed method. The proposed method is simple in algorithm with low computational complexity, only uses single-end information to quickly identify faults, and has a strong ability to withstand system disturbances.

Keywords:

Foundation:
This work is supported by National Key R&D Program of China (No. 2018YFB0904600).
引用本文
[1]王强钢,倪静怡,廖建权,等.基于模量相平面的柔性直流电网T接线路故障识别方法[J].电力系统自动化,2021,45(14):140-148. DOI:10.7500/AEPS20201030011.
WANG Qianggang, NI Jingyi, LIAO Jianquan, et al. Fault Identification Method for Teed Lines of Flexible DC Power Grid Based on Modulus Phase Plane[J]. Automation of Electric Power Systems, 2021, 45(14):140-148. DOI:10.7500/AEPS20201030011.
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  • 收稿日期:2020-10-30
  • 最后修改日期:2021-03-15
  • 录用日期:
  • 在线发布日期: 2021-07-21
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