|WANG Guoyu,FAN Chunju,HUANG Yue.Single-terminal fault location method in DC distribution network based on initial ratio of transient voltage and time-domain iteration[J].Electric Power Automation Equipment,2023,43(11):82-88
|关键词: 直流配电网 故障测距 迭代法 单端电气量 暂态电压比
|Single-terminal fault location method in DC distribution network based on initial ratio of transient voltage and time-domain iteration
WANG Guoyu, FAN Chunju, HUANG Yue
School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
|Aiming at the problem of low accuracy of single-terminal fault location in DC distribution network, a single-terminal fault location method based on transient voltage ratio is proposed. By analyzing the characteristics and mathematical expressions of the fault capacitance at both terminals of the current-limiting reactor, a fault location scheme based on the transient voltage ratio at both terminals of the current-limiting reactor is constructed in the time domain, and the influence of the transition resistance on the fault locating accuracy is reduced by an iterative method. The method uses single-terminal electrical quantities. It has strong resistance to transition resistance without strict requirements on communication, and does not need to install synchronization device, thus improving the accuracy of single-terminal fault location of DC distribution network lines. The multi-terminal DC distribution network model is built on the PSCAD/EMTDC platform, and the simulation analysis of the proposed location method is carried out. The results show that the proposed method can achieve accurate fault location based on single-terminal electrical quantities.
|Key words: DC distribution network electric fault location iterative method single-terminal electrical quantities ratio of transient voltage