摘要
结合深圳多端柔性直流配电示范工程,研究了柔性直流配电网的保护配置和直流线路故障定位方法。首先根据实际工程的电路拓扑结构,明确了柔性直流配电网保护区域的划分方法。其次结合MMC换流器及直流配电网的故障特性,提出了各保护区域的保护配置方案。最后针对直流线路"T"接负荷与微电网的特点,重点介绍了直流线路单极故障、双极故障及断线故障的保护配置和故障定位方法。在电磁暂态仿真软件PSCAD/EMTDC下搭建了基于MMC的直流配电网仿真模型,通过仿真验证了保护配置策略的正确性和直流线路故障定位的可行性。
A protection configuration strategy and fault location method of the demonstration project of flexible DC distribution system in Shenzhen is studied. Firstly, focusing on the topology structure of the project, the protection area of DC distribution network is divided. Secondly, an overall protection configuration strategy is presented considering MMC and the system＇s faulty characteristics. Thirdly, as the new feature of the load and micro grid being connected with the DC line with ＂T＂ type, the protection configuration and fault location method of DC line single-pole fault, double-pole fault and broken line fault is proposed. Lastly, the simulation model of MMC based DC distribution grid is built on PSCAD/EMTDC, and the simulation results verify the effectiveness of the protection configuration strategy and the correctness of the fault location method.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2015年第22期127-133,共7页
Power System Protection and Control
基金
国家863课题(2013AA050104)~~
关键词
柔性直流配电网
保护配置
直流线路故障
故障定位
MMC based distribution grid
protection configuration strategy
DC line protection coordination
fault location method
