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基于故障分量差动电流极性特征的直流线路故障全过程保护原理
侯俊杰1, 宋国兵1, 常仲学1, 张晨浩1, 尹利帅1, 韩伟2
1.西安交通大学 电气工程学院,陕西 西安 710049;2.国网河南省电力公司科学研究院,河南 郑州 450000
摘要:
为了提高直流线路保护的可靠性,需要研究能够在故障暂态和稳态过程中均可识别故障的后备保护原理。提出了基于故障分量差动电流极性特征的故障全过程差动保护原理。通过对故障暂态阶段(换流器未响应阶段、换流器动态调节阶段)及故障稳态阶段的电流故障分量特征进行分析,得出故障全过程中整流和逆变侧故障分量差值在区内故障时满足正极性特征而区外故障时不满足的结论,建立面向故障全过程的差动保护判据。仿真结果表明了该判据在各种工况条件下的正确性,受交流系统故障特征谐波影响小,具有较强的抗过渡电阻性能和抗干扰能力。
关键词:  直流输电  直流线路  故障全过程  继电保护  差动保护  故障分量
DOI:10.16081/j.epae.201909046
分类号:TM77
基金项目:国家自然科学基金联合基金重点支持项目(U1766-209);国家电网公司总部科技项目(52170218000M)
DC line fault protection principle based on polarity characteristics of differential current of fault components for whole process of failure
HOU Junjie1, SONG Guobing1, CHANG Zhongxue1, ZHANG Chenhao1, YIN Lishuai1, HAN Wei2
1.School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2.State Grid Henan Electric Power Company Scientific Research Institute, Zhengzhou 450000, China
Abstract:
In order to improve the reliability of DC line protection, it is necessary to study the principle of back-up protection that can distinguish faults in both steady and transient state processes. A differential protection principle based on polarity characteristics of differential current of fault components is proposed for the whole process of failure. By analyzing the characteristics of the current fault components in transient stage, i. e. the non-response stage and the dynamic regulation stage of converter, and the steady-state stage of faults, it is found that in the whole process of failure, the difference of the fault components between rectifier and inverter side satisfies the positive polarity characteristics in internal fault while not sa-tisfies the positive polarity characteristics in external fault. The differential protection criteria for the whole process of failure are established. Simulative results show that the criteria can operate correctly under various working conditions, and is less affected by the harmonics of fault characteristics of AC system with strong anti-transition-resistance ability and anti-interference ability.
Key words:  DC power transmission  DC line  whole process of failure  relay protection  differential protection  fault component

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