摘要
柔性直流电网是多类型可再生能源高效外送的重要途径,如何设计高效的重合闸策略使其具备故障后快速恢复能力,是提高整个交直流电网稳定性需要解决的关键性问题。根据直流断路器以及换流器的工作机理,提出一种断路器-换流器协调配合的重合闸控制策略及逻辑流程。为验证所提出的方法,在Matlab平台中搭建了3端500 kV柔性电网模型以及直流断路器模型进行仿真验证,此外还搭建了8开关组的断路器实验样机,与Matlab中的柔性直流电网进行数字物理混合实验验证,证明了所提出的重合闸策略的可行性以及工程适用性。
Flexible DC power grid is an important way for efficient transmission of various types of renewable energy. How to design an efficient reclosing strategy to make it have the ability of rapid recovery after fault is a key problem to improve the stability of the whole AC/DC power grid. According to the working mechanism of DC circuit breaker and converter,a reclosing control strategy and logic flow of circuit breaker & converter coordination was proposed. In order to verify the proposed method,a three terminal 500 kV flexible power grid model and a DC circuit breaker model were built in Matlab platform for simulation verification. In addition,a circuit breaker experimental prototype of 8 switch groups was built,and the digital physical hybrid experiment with the flexible DC power grid in Matlab was carried out to verify the feasibility and engineering applicability of the proposed reclosing strategy.
作者
叶海
YE Hai(East China branch of State Grid Corporation of China,Shanghai 200001,China)
出处
《电气传动》
2022年第21期45-49,57,共6页
Electric Drive
关键词
直流电网
直流断路器
重合闸
控制策略
实验样机
DC grid
DC circuit breaker
reclosing
control strategy
experimental prototype
