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北京交通大学电气工程学院,北京市 100044
张大海(1973—),男,通信作者,博士,副教授,博士生导师,主要研究方向:电力系统监控、继电保护与电能质量等。E-mail:dhzhang1@bjtu.edu.cn
杨宇辰(1997—),男,硕士研究生,主要研究方向:直流输电故障分析与保护。E-mail:19121518@bjtu.edu.cn
梁晨光(1991—),男,博士研究生,主要研究方向:高压直流线路故障重启与恢复。E-mail:18117012@bjtu.edu.cn
收稿:2021-05-19,
修回:2021-11-05,
网络出版:2022-03-15,
纸质出版:2022-04-25
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张大海,杨宇辰,梁晨光等.基于改进直流断路器注入信号的柔直电网自适应重合闸方案[J].电力系统自动化,2022,46(8):123-132.
ZHANG Dahai,YANG Yuchen,LIANG Chenguang,et al.Adaptive Reclosing Scheme for Flexible DC Power Grid Based on Improved DC Circuit Breaker Injecting Signal[J].Automation of Electric Power Systems,2022,46(8):123-132.
张大海,杨宇辰,梁晨光等.基于改进直流断路器注入信号的柔直电网自适应重合闸方案[J].电力系统自动化,2022,46(8):123-132. DOI: 10.7500/AEPS20210519006.
ZHANG Dahai,YANG Yuchen,LIANG Chenguang,et al.Adaptive Reclosing Scheme for Flexible DC Power Grid Based on Improved DC Circuit Breaker Injecting Signal[J].Automation of Electric Power Systems,2022,46(8):123-132. DOI: 10.7500/AEPS20210519006.
采用架空线路的柔性直流电网容易发生瞬时性故障,需要配置快速、可靠的重合闸方案。常规的自动重合闸方案缺乏对故障性质的预判,而基于换流器注入信号的故障性质判别方法不利于多端直流电网的功率传输。针对上述问题,提出一种适用于混合式直流断路器的RCT型缓冲电路(由电阻、电容、晶闸管构成),增加主动信号注入模式来实现自适应重合闸,避免信号产生过程对多端直流电网功率传输的稳定性造成影响。在此基础上,详细推导限流电抗器的衰减作用,合理选取注入电压脉冲的宽度;进一步提出基于行波保护信息的注入信号幅值自适应调整策略,提高故障性质判别方法的耐受过渡电阻能力。大量仿真算例验证了所提重合闸方案的可行性和优越性。
The flexible DC power grid with overhead lines is prone to transient faults
so it is necessary to configure a fast and reliable reclosing scheme. The conventional automatic reclosing scheme lacks the prediction of fault nature
and the fault nature discrimination method based on the converter injection signal is not conducive to the power transmission of the multi-terminal DC power grid. To solve the above problems
a resistor-capacitor-thyristor (RCT) snubber circuit suitable for a hybrid DC circuit breaker is proposed. The active signal injecting mode is added to realize adaptive reclosing
so as to avoid the influence of the signal generation process on the stability of power transmission in a multi-terminal DC power grid. On this basis
the attenuation effect of the current limiting reactor is deduced in detail
and the width of injecting voltage pulse is reasonably selected. Furthermore
an adaptive adjustment strategy of injecting signal amplitude based on the traveling wave protection information is proposed to improve the ability of fault nature discrimination method to withstand the transition resistance. A large number of simulation cases verify the feasibility and superiority of the proposed reclosing scheme.
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