高压直流断路器全开断时间及其影响因素的研究

Research on Full Interruption Time and Its Influencing Factors of High Voltage DC Circuit Breaker

高压直流断路器(high voltageDCcircuitbreaker,HVDC CB)的全开断时间对高压直流输电系统有着至关重要的影响。文中基于人工过零型机械式高压直流断路器对断路器的分断过程进行分段研究,利用L⁃C回路产生的低频振荡电流模拟开断故障电流,通过PSCAD/EMTDC电磁仿真软件对高压直流断路器的开断过程进行仿真实验,并通过仿真实验探究影响断路器全开断时间的主要因素。结果表明,减少换流支路的电容值、调整避雷器的参考电压以及减小换流回路的投入时刻可以减少高压直流断路器的全开断时间。这些结论为研究机械式高压直流断路器的全开断时间打下了基础。

The full interruption time of HVDC CB is very important for HVDC transmission system.In this paper,based on the artificial zero crossing mechanical high⁃voltage DC circuit breaker,the interruption process of the cir⁃cuit breaker is studied.The low⁃frequency oscillation current generated by L⁃C circuit is used to simulate the inter⁃rupting fault current.The interrupting process of the high⁃voltage DC circuit breaker is simulated through PSCAD/EMTDC electromagnetic simulation software,and the main factors affecting the full interruption time of the circuit breaker are explored through simulation experiment.The results show that reducing the capacitance of the commuta⁃tion branch,adjusting the reference voltage of arrester as well as reducing the input time of converter circuit can re⁃duce the full interruption time of the HVDC circuit breaker.These conclusions lay a foundation for the researching the full interruption time of mechanical HVDC circuit breakers.