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1.电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市 710049
2.中国南方电网广东电网有限责任公司,广东省广州市 510000
3.国网江西省电力有限公司电力科学研究院,江西省南昌市 330006
常鹏(1997—),男,博士研究生,主要研究方向:电力系统继电保护。E-mail:cp19970109@stu.xjtu.edu.cn
宋国兵(1972—),男,通信作者,博士,教授,博士生导师,主要研究方向:电力系统继电保护。E-mail:song.gb@mail.xjtu.edu
刘玮(1972—),男,硕士,高级工程师,主要研究方向:继电保护技术管理。E-mail:tuoniao35@163.com
收稿:2022-04-07,
修回:2022-09-05,
网络出版:2023-10-18,
纸质出版:2023-11-25
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常鹏,宋国兵,刘玮等.基于控保协同的逆变器并网系统故障线路阻抗计算方法[J].电力系统自动化,2023,47(22):87-100.
CHANG Peng,SONG Guobing,LIU Wei,et al.Calculation Method of Faulty Line Impedance for Inverter-interfaced System Based on Control and Protection Coordination[J].Automation of Electric Power Systems,2023,47(22):87-100.
常鹏,宋国兵,刘玮等.基于控保协同的逆变器并网系统故障线路阻抗计算方法[J].电力系统自动化,2023,47(22):87-100. DOI: 10.7500/AEPS20220407002.
CHANG Peng,SONG Guobing,LIU Wei,et al.Calculation Method of Faulty Line Impedance for Inverter-interfaced System Based on Control and Protection Coordination[J].Automation of Electric Power Systems,2023,47(22):87-100. DOI: 10.7500/AEPS20220407002.
传统单端量故障线路阻抗计算方法易受过渡电阻和系统参数影响,性能仍存在提升空间。为了提高故障线路阻抗的计算准确性,提出了一种基于控保协同的逆变器并网系统故障线路阻抗计算方法。其利用换流器系统的高可控性,在故障穿越阶段构造2种运行状态,为系统发生不对称故障时故障线路阻抗的准确计算创造了条件。当线路末端含有纯容性串补装置时,所提方法能够准确计算故障线路阻抗,且能根据串补带来的电抗偏差区分对端区内外故障,以保护线路全长。PSCAD仿真结果证明了该方法不受过渡电阻阻值及性质、系统参数影响。该方法在单回线系统和双回线系统中均可应用,其结果可以应用于距离保护和故障测距。
The traditional single-ended faulty line impedance calculation method is susceptible to the influence of transition resistance and system parameters
and there is still room for improvement in performance. In order to improve the accuracy of calculating the faulty line impedance
a method based on control and protection coordination for calculating the impedance of faulty lines in inverter-interfaced systems is proposed. The method utilizes the high controllability of the inverter system to construct two operating states in the fault ride-through stage
creating conditions for accurate calculation of faulty line impedance in the event of asymmetric faults in the system. When there is a pure capacitive series compensation device at the end of the line
the proposed method can accurately calculate the impedance of the faulty line and distinguish between internal and external faults in the terminal area based on the reactance deviation caused by series compensation
to protect the entire length of the line. The PSCAD simulation results demonstrate that this method is not affected by the transition resistance value and properties
as well as system parameters. This method can be applied in both single-circuit and double-circuit systems
and its results can be applied to distance protection and fault location.
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