混合式直流断路器电流转移开关核心性能研究与参数设计

Research on Core Performance and Parameter Design of Current Commutation Switch in Hybrid HVDC CB

主支路电流转移开关是混合式高压直流断路器的核心部件,其转移电流的成功将直接影响断路器开断功能,为实现其在断路器中高效可靠工作,该文对电流转移开关核心性能进行研究。采用定性分析结合定量计算的方法,分析电流耐受、电压耐受、转移能量和可用率等性能的影响因素,并依据张北±500kV柔性直流电网技术要求,设计500kV混合式断路器主支路电流转移开关参数,研制全尺寸样机,并对样机进行性能测试,测试结果表明设计方法满足要求,验证所提方法的科学性和合理性。

As a crucial part of the hybrid DC circuit breakers(DCCB), the current commutating success of the current commutation switch(CCS) of main branch will directly affect the breaking performance of DCCB. In order to improve the operating efficiency and reliability of CCS, this paper extracted the core performance and parameters of CCS. Based on the qualitative analysis and quantitative calculation, the influencing factors of current, voltage and commutating energy tolerance and availability ratio were studied. According to the technical requirements of Zhangbei ± 500 kV VSC-based DC grid, a full-scale CCS prototype of 500 kV hybrid DCCB was designed. The performance of the prototype was tested, and the test results met the design requirements and verified the constraint methods.