电力系统自动化2017，Vol.41Issue(17)：78-86,9.DOI:10.7500/AEPS20161011007
柔性中压直流配电网线路保护方案
Line Protection Schemes for Flexible Medium Voltage DC Distribution Networks
摘要
Abstract
A new protection scheme for the medium voltage DC line in the "hand-in-hand" multi-terminal flexible DC distribution network is designed based on the communication system and DC circuit breakers.Firstly, the configuration of the flexible DC distribution system and the fault characteristics of the medium voltage DC system are described.Then, a quick-acting main protection scheme is designed for pole-to-pole faults and pole-to-ground faults with low fault resistance.The current information and current state matrix of each relay is used to identify the fault type and fault area to isolate the fault area within 5 ms.Subsequently, a backup protection scheme is designed for possible pole-to-ground faults with high fault resistance.In such cases, the unbalanced voltage is taken as the startup criterion, with the fault area isolated according to the state of the unbalanced current of each relay.Besides, a first-step and a second-step remote backup protection each are designed in case of failures of DC circuit breakers and communication devices.Additionally, the cooperation between the protection system and the control system is taken into consideration to make sure the healthy area is supplied normally.Finally, simulation results in PSCAD/EMTDC verify the effectiveness of the proposed protection scheme.关键词
直流配电系统/直流断路器/保护策略/故障隔离/故障识别Key words
DC distribution system/DC circuit breaker/protection scheme/fault isolation/fault identification引用本文复制引用
戴志辉,葛红波,陈冰研,焦彦军,王增平..柔性中压直流配电网线路保护方案[J].电力系统自动化,2017,41(17):78-86,9.基金项目
国家重点研发计划资助项目(2016YFB0900203) （2016YFB0900203）
国家自然科学基金资助项目(51307059) （51307059）
中央高校基本科研业务费专项资金资助项目(2017MS096).This work is supported by National Key Research and Development Program of China (No.2016YFB0900203), National Natural Science Foundation of China (No.51307059), and Fundamental Research Funds for the Central Universities (No.2017MS096). （2017MS096）
