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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
Received:30 October 2020,
Revised:2021-03-15,
Published Online:31 May 2021,
Published:25 July 2021
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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.
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.
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.
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。
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.
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