具有转移电容电压调整功能的重合闸机械式直流断路器

Reclosing Mechanical DC Circuit Breaker with Transfer Capacitive Voltage Adjustment Capability

近年来中高压直流输电系统因其具有输送容量大、距离远的特点被广泛应用于电力传输,其中直流短路故障的制约和清除是影响直流电网安全稳定运行的重要因素。文中提出了一种新型具有转移电容电压调整功能的重合闸机械式直流断路器拓扑结构,利用一次开断后转移电容上的残留电压能够节省断路器重合闸所需的转移支路。研究了电压调整回路关键参数的整定方法,使调整回路能够将一次放电后的转移电容电压调整到合适的数值。最后,验证了文中所提拓扑对不同开断电流的适应性情况,发现拓扑对所有全电流开断工况都具有很好地适应性。

In recent years,medium and high voltage direct current transmission system has been widely used in power transmission due to its such characteristics as large capacity and long transmission distance.The limitation and clearance of DC short circuit fault is an important factor affecting safe and stable operation of DC network. In this paper,a kind of topology of new type of mechanical DC circuit breaker with transfer capacitive voltage adjustment capability is proposed.The use of residual voltage on the transfer capacitor after the first interruption can save the transfer branch needed for re-closing operation of the circuit breaker.The setting method of key parameters of voltage adjustment circuit is studied so to keep the adjustment circuit can adjust the transfer capacitive voltage after a discharge to the appropriate value.Finally,the adaptability of the topology proposed in this paper to different breaking currents is verified,and it is found that the topology has a good adaptability to all full current interruption conditions.