机械式高压直流断路器工程应用研究

Engineering Application Research for Mechanical HVDC Circuit Breaker

针对柔性直流输电系统直流侧故障快速清除的难题,结合南澳多端柔性直流输电工程的实际生产应用需求,提出了一种新型机械式高压直流断路器拓扑方案,研制出了160 kV超快速机械式高压直流断路器产品,提出了一种采用发电机源提供电流来模拟直流故障的开断试验方法,并完成了双向大电流开断试验,开断电流大于9 kA、开断时间小于5 ms。研究并提出了160 kV机械式高压直流断路器工程应用技术方案,并完成南澳加装高压直流断路器示范工程的现场系统调试,试验结果表明其圆满地解决了南澳多端柔性直流系统第三站在线投切和直流线路故障隔离清除的难题,有效地提高了南澳多端柔性直流输电系统的灵活性和可靠性。

For the problem of fast isolating of the DC side fault of the VSC-HVDC transmission system, and combining the actual application requirements of Nanao multi-terminal VSCHVDC transmission project, this paper proposes a new topology of mechanical HVDC circuit breaker. Then an ultra-fast 160 k V mechanical HVDC circuit breaker has been developed and a test circuit with the use of generator source to provide AC current to simulate the DC fault current breaking is proposed. The positive and negative high current breaking tests are performed. The experimental results show that the breaking current is greater than 9 k A, the breaking time is less than 5 ms. The engineering application technology program of the 160 k V mechanical HVDC circuit breaker is researched and proposed. And the onsite system commissioning of the Nanao HVDC circuit breaker project is completed, the experimental results show that it satisfactorily solved the problems of online switching of the third station and fast isolating of the DC side fault for Nanao multi-terminal VSC-HVDC system. It has effectively improved the flexibility and reliability of Nanao multi-terminal VSCHVDC transmission system.