适用于高压直流断路器的多断口串联高速机械开关同步性研究

Research on synchronization of series multi-break high-speed mechanical switch for HVDC circuit breaker

多断口串联的高速机械开关作为混合式高压直流断路器的重要组成部分,其多断口间的同步性对高压直流断路器的开断性能有着重要影响。对多断口高速机械开关的拓扑结构和工作原理进行了研究,分析了操动机构的线圈参数、储能电容、环境温度、充电电压、控制系统等因素对同步性的影响规律,并提出了通过控制线圈内阻、储能电容值偏差和工艺等措施保证断口间的同步性。在此基础上,对张北多端柔性直流工程535 kV混合式高压直流断路器用高速机械开关的同步性进行测试,测试结果表明各断口的分散性在±0.2 ms内,为高压直流断路器的可靠开断提供了保证。

The series multi-break high-speed mechanical switch is an important part of hybrid high voltage direct current(HVDC)circuit breaker,and the synchronous performance between multi-breaks of high-speed mechanical switch has an important impact on the breaking performance of HVDC circuit breaker.The topo-logy structure and working principle of multi-break high-speed mechanical switch are studied.The influence law of coil parameters,energy storage capacitance,ambient temperature,charging voltage,control system and other factors of the operating system on the synchronism is analyzed,and the measures to ensure the synchronism between multi-breaks by controlling the internal resistance of the coil,the deviation of the energy storage capacitance value and the process are proposed.On this basis,the synchronization of the high-speed mechanical switch of 535 kV hybrid DCCB in Zhangbei multi terminal flexible DC project is tested.The test results show that the dispersion of each fracture is within±0.2 ms,which provides a guarantee for the reliable breaking of the hybrid HVDC circuit breakers.