多端口电感耦合型直流限流断路器快速重合闸策略

高压直流（high voltage DC，HVDC）电网是连接可再生能源与交流主网的主要载体，直流故障后的恢复速度对整个交直流电网的稳定性有重要影响。基于多端口电感耦合型高压直流限流断路器，提出一种与直流电网换流器控制策略相配合的快速重合闸策略。介绍了多端口限流断路器的拓扑结构，分析了换流器控制策略对故障隔离后直流电压的影响，并对限流断路器的重合闸时序进行了选择，形成了与风电场等弱交流系统连接的换流器-断路器协调配合重合闸的控制策略及逻辑流程。在4端双极直流电网仿真模型中，验证了所提重合闸策略具有冲击电流较低，故障恢复时间较短的优势。

Adaptive Reclosing Strategy of Multi-port Inductively Coupled Current Limiting DC Circuit Breaker

HVDC power grid is the main carrier connecting renewable energy and AC main network. The post-DC fault recovery speed greatly impacts the stability of the whole AC/DC power grid. Based on multi-port inductively coupled high voltage DC current limiting circuit breaker, a fast reclosing strategy coordinating with converter control strategy of HVDC grid was proposed. Firstly, the topological structure of multi-port current limiting dc circuit breaker was briefly presented. Secondly, the influence of converter control strategy on DC voltage after fault isolation was analyzed. Thirdly, the reclosing sequence of current limiting circuit breaker was selected and the control strategy and logic flow of coordinated reclosing for converter-circuit breaker connected with such weak AC system as wind farm and so on were formed. Finally, in a simulation model of four-terminal bipolar HVDC grid it is verified that there is relatively lower impulse current in the proposed reclosing strategy and the failure recovery time is shorter.