识别模型参数的电压源换流器型直流输电线路纵联保护  

Novel Pilot Protection for Voltage Source Converter High Voltage Direct Current Transmission Lines by Identifying Model Parameters

作　　者：宋国兵[1] 靳幸福[1] 李德坤[1,2] 靳东晖[1] 马志宾[1] 索南加乐[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]山东电力集团公司济南供电公司,济南250012

出　　处：《西安交通大学学报》2013年第8期110-114,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51177128;51037005);高等学校博士学科点专项科研基金资助项目(20110201110056)

摘　　要：针对电压源换流器型直流(VSC-HVDC)输电线路主保护耐过渡电阻能力差、后备保护动作速度慢的问题,提出了一种识别模型参数的VSC-HVDC输电线路纵联保护新原理。该原理将区外故障等效为正的电容模型,区内故障等效为负的电容模型。对于电压等级为±60kV、电缆线路长为300km的VSC-HVDC仿真模型,发生区外故障时,识别出的线路对地电容约为80μF;发生区内故障时,识别出的并联电容负值约为-1 000μF。通过判别识别出的电容值的正负,即可区分区内和区外故障。结果表明,该原理不受过渡电阻、线路分布电容和控制方式的影响,灵敏度较高,在各种工况下均能在发生故障后10ms内准确区分区内和区外故障,具有一定的实用价值。To solve the problems in the existing protection for high voltage source converter high voltage direct current （VSCHVDC） transmission lines, such as insufficient sensitivity for main protection and slow operation for backup protection, a novel pilot protection for VSCHVDC transmission lines by identifying model parameters is proposed. In the principle, the external fault is equivalent to a positive capacitance model, while the internal fault is equivalent to a negative capacitance model. For a ±60 kV VSCHVDC simulation model of 300 km cable lines, the identified capacitance is positive linetoground one, about 80 μF, when an internal fault occurs; the identified capacitance is negative shunt one, about -1 000 μF, when an external fault occurs. Internal faults and external faults can be distinguished by judging whether the identified capacitor is positive or negative. The results show that this principle, unaffected by transition resistance, line distributed capacitance and control type, can identify internal faults and external faults reliably within 10 ms under various operating conditions with sufficient sensitivity.

关 键 词：电压源换流器直流输电 模型识别 纵联保护 故障分量 

分 类 号：TM77[电气工程—电力系统及自动化]