混合式直流断路器快速机械开关特性研究及应用

国家大型风电、光伏等“绿色、低碳”新型清洁能源的并网消纳,迫切需要柔性直流输电新技术及新设备的开发研究。依托张北柔性直流电网试验示范工程,系统研究了混合式直流断路器的核心设备——快速机械开关。基于混合式直流断路器的工作原理及快速机械开关的性能要求,提出了多断口真空开关串联均压的高电压大电流快速机械开关实现方案;通过对快速机械开关分闸动态特性的有限元仿真计算,表明快速机械开关能够在2 ms内运动到耐受暂态开断电压绝缘距离;并通过电气性能试验对仿真计算结果进行了验证。研制成功的高电压大电流快速机械开关已投入张北柔性直流电网试验示范工程实际应用。

Research and Application of Rapid Mechanical Switch of Hybrid DC Circuit Breaker

The grid-connected consumption of "green and low-carbon" new energy such as large-scale wind power and new photovoltaic power urgently needs the development and research on new flexible DC transmission technology and equipment. On the basis of the test and demonstration project of Zhangbei DC power transmission, this paper systematically studies the core equipment of hybrid DC circuit breaker. According to the working principle of hybrid DC circuit breaker and the performance requirements of fast mechanical switch, the high-voltage fast mechanical switch is proposed. Through the finite element simulation of the dynamic characteristics of fast mechanical switch, it shows that the fast mechanical switch can move to the transient voltage insulation distance within 2 ms, and the simulation results are verified by electrical performance test. The successfully developed high-voltage and high-current fast mechanical switch has been put into practice in Zhangbei HVDC transmission test and demonstration project.