Fast DC fault location and isolation strategy for the flexible multi-terminal DC system

The Journal of Engineering

Yiping Luo¹  Jinghan He² 

[1] School of Electrical Engineering, Beijing Jiaotong University , Haidian District, Beijing 100044 , People's Republic of China

关键词: collaborative DC fault location strategy;    flexible multiterminal DC system;    voltage source converters;    four-terminal VSC-MTDC system;    fast DC fault isolation strategy;    collaborative DC fault isolation strategy;    protection methods;    typical DC circuit breaker-based strategy;    protection device;    fast di-dt criterion;    fast DC fault location strategy;    VSC-based multiterminal DC;    fault pretreatment;    protection strategy;    fault location method;    transient-voltage energy difference criterion;    PSCAD-MTDC platform;    hybrid DC circuit breakers;    DC fault current;   

DOI  :  10.1049/joe.2018.0250

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

Voltage source converters (VSCs) are highly vulnerable to DC fault current. Protection methods which can quickly locate and isolate DC faults are necessities in VSC-based multi-terminal DC (VSC-MTDC) systems for its safe and reliable operation. In this paper, a fast and collaborative DC fault location and isolation strategy are proposed. In this strategy, hybrid DC circuit breakers (HDCCBs) are used as the main protection device. The operation control of HDCCB is redesigned and cooperates with fault location results to achieve fast fault isolation. For the fault location method, a fast di/dt criterion is used for fault pretreatment, the transient-voltage energy difference criterion is used to make sure its selectivity. The overall protection strategy is demonstrated in a four-terminal VSC-MTDC system using PSCAD/EMTDC platform. The performances of the typical DC circuit breaker-based strategy and the proposed strategy were compared. Numerous simulation results under various conditions proved its flexibility and validity.

【 授权许可】

CC BY