一种具有限流能力的新型混合式高压直流断路器拓扑

受到高压直流断路器开断容量以及关断时间的限制，直流电网面临故障抑制与清除的难题。提出了一种具有限流能力的混合式高压直流断路器拓扑，通过在电流转移回路中引入限流装置，达到有效抑制故障电流目的。分析了该断路器的拓扑结构、工作原理，并给出了断路器关键参数的计算方法，最后，针对三端柔性直流输电系统应用，在PSCAD/EMTDC平台进行仿真验证。仿真结果表明相较于其他方案，该断路器在系统正常运行情况下的通态损耗小、动态特性好，出现故障时能够快速切除故障电流，满足多端柔性直流输电系统对故障电流的抑制要求。

A novel hybrid high-voltage DC circuit breaker topology with current limiting capability

Due to the limitation of the breaking capacity and the off time of high-voltage DC(Direct Current) circuit breaker, DC grid faces the problem of fault suppression and elimination. A hybrid high-voltage DC circuit breaker topology with current limiting capability is proposed. By introducing a current limiting device into the current transfer loop, the purpose of effectively suppressing the fault current is achieved. The topology and working principle of the circuit breaker are analyzed, and the calculation methods of the key parameters of the circuit breaker are given. Finally, for the application of the three-terminal flexible DC transmission system, the simulation is verified on the PSCAD/EMTDC platform. The results show that, compared with other schemes the circuit breaker has the advantage in decreasing on-state loss under system normal operating conditions and removing fault current quickly in case of fault, which meets the DC fault current suppression requirement of the multi-terminal flexible DC transmission system.