State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University
Flexible DC distribution network is an important area of the development of power distribution system, which can be built by overhead lines or cables. Considering the fault occurred on overhead lines is mostly temporary, it is necessary for DC distribution networks based on overhead lines to adopt effective reclosing scheme to improve power reliability. In order to realize this purpose, this paper utilizes the different phase characteristics between line terminal voltage and current, and further purposes an adaptive reclosing scheme based on cascaded full-bridge DC circuit breaker, Firstly, generate fault detection voltage at a given frequency by control of the transmission branch of DCCB. Then, distinguish temporary or permanent fault according to the different phase characteristics of DCCB line terminal voltage and current at this frequency. Besides, the influence of some factors like transitional resistance is analyzed. Finally, a model of DC distribution network is built up on PSCAD/EMTDC to verify the feasibility and effectiveness of this adaptive reclosing scheme.
ZHENG Tao,LYU Wenxuan.Adaptive Reclosing Scheme Based on Cascaded Full-bridge DC Circuit Breaker For DC Distribution Network[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20200115010.