摘要
直流断路器是交直流混合配电网组网的关键,然而在考虑技术经济性时,当前直流配电断路器仍沿用高压直流输电等级断路器拓扑方案的思路不再适用,亟需开发经济型直流开断技术,实现中压直流配电断路器成本和性能的平衡。文中针对交直流混合配电网直流侧故障电流经济高效开断这一关键问题,基于直流熔断器和强迫过零开断技术,提出一种基于熔断器的组合式直流开断方案,该方案采用直流熔断器与转移开关并联后再与直流负荷开关串联的形式,利用低成本的直流限流熔断器开断大电流,减轻直流负荷开关的开断要求,进而降低整机成本,在兼顾经济性的同时实现了电流的全范围开断。通过PSCAD仿真计算,和在LC振荡回路中进行的15 kA开断实验结果表明,提出的组合式直流开断方案可以满足交直流混合配网直流侧故障快速切除的需求。
DC circuit breaker is the key for AC/DC hybrid distribution networking.However,in the consideration of techno-economic effect,the idea of adopting the topological scheme of circuit breaker at HVDC transmission level for DC distribution circuit breaker is not applicable any longer.It is urgently necessary to develop economic DC breaking technology and to achieve the balance of cost and performance of medium voltage DC distribution circuit breaker.In view of the key issue of economical and high efficient interruption of fault current at the DC side of AC/DC hybrid distribution network,a kind of combined DC interruption scheme is proposed based on DC fuse and forced zero-crossing interruption technology.This scheme is formed of DC fuse in parallel with transfer switch and then in series with DC load switch.The low-cost DC current-limiting fuse is used to interrupt high current,which alleviates the interruption requirement of DC load switch,reduces the cost of the DC switchgear and,at the consideration of economic performance,achieves full range interruption of current.It is shown by the PSCAD simulation calculation and 15 kA breaking experiment result which is performed in the LC oscillation circuit that the proposed combined DC interruption scheme can meet the requirements of fast clearance of the the fault at the DC side of AC/DC hybrid distribution network.
作者
王昊晴
刘宁
李向阳
赵彩虹
段青
WANG Haoqing;LIU Ning;LI Xiangyang;ZHAO Caihong;DUAN Qing(China ElectricPowerResearchInstitute,Beijing 100192,China)
出处
《高压电器》
CAS
CSCD
北大核心
2023年第10期38-45,53,共9页
High Voltage Apparatus
基金
中国电力科学研究院创新基金项目(PD84-22-003)。
关键词
熔断器
转移开关
组合式直流开断
交直流混合配网
fuse
transfer switch
combined DC interruption
AC/DC hybrid distribution network
