高电压技术2011，Vol.37Issue(8)：1989-1996,8.
利用电流频率特性的VSC—HVDC直流输电线路纵联保护
New Pilot Protection for VSC-HVDC Transmission Lines Using Natural Frequency Characteristic of Current
摘要
Abstract
The natural frequency signal of DC lines is more obvious than that of AC lines. Combining the system structure, it is found that the natural frequency of VSC-HVDC is related with line length. Theoretically, the natural frequency differential is zero for external fault and it is a huge value for the internal fault. Accordingly, a new pilot protection principle and its primary criterion for HVDC transmission line are proposed based on current spectrum a- nalysis at both ends. For the dead zone at the midpoint of the line, a secondary criterion is proposed. At the same time, the system of VSC-HVDC is built in PSCAD and various faults are simulated. In the protection principle,only current information of both converters are used and synchronization is not needed for the transmission of natural fre- quency. The simulation results show that the protection principle can identify the faults reliably and rapidly in differ- ent conditions, and is not affected by the fault resistance.关键词
电压源换流器型直流输电/直流输电线路/纵联保护/系统结构/固有频率/Prony算法Key words
VSC-HVDC/HVDC transmission line/pilot protection/system structure/natural frequency/Prony al-gorithm分类
信息技术与安全科学引用本文复制引用
宋国兵,蔡新雷,高淑萍,索南加乐,杨忠礼..利用电流频率特性的VSC—HVDC直流输电线路纵联保护[J].高电压技术,2011,37(8):1989-1996,8.基金项目
国家自然科学基金（51037005）. （）
