DC Fault Characteristics and Line Fault Recovery Strategy in Flexible DC Power Network
Su Jianshen1, Guo Jingdong2, Jin Tao1
1. College of Electrical Engineering and Automation Fuzhou University Fuzhou 350116 China; 2. State Grid Fujian Electric Power Research Institute Fuzhou 350007 China
Abstract：DC-side faults are the key issue of HVDC transmission based on modular multilevel converters(MMC), and in particular HVDC transmission is popularized for overhead line applications. In this paper, the characteristics of DC short-circuit faults are studied for a flexible DC power system. The half-bridge MMC fault equivalent circuit is established and the corresponding over-current analytical equation is deduced. The working mode of the hybrid DC circuit breaker breaking fault current is studied. A hybrid DC circuit breaker is used to propose a line reclosing strategy. On the PSCAD/EMTDC platform, a DC grid system simulation model was built to verify the effectiveness and feasibility of the proposed scheme. The results show that after the hybrid circuit breaker recloses, within 0.1s, the power of each converter station recovers and maintains stable operation. The DC grid can cross the short-circuit fault quickly and steadily.
苏见燊, 郭敬东, 金涛. 柔性直流电网中直流故障特性分析及线路故障重启策略[J]. 电工技术学报, 2019, 34(zk1): 352-359.
Su Jianshen, Guo Jingdong, Jin Tao. DC Fault Characteristics and Line Fault Recovery Strategy in Flexible DC Power Network. Transactions of China Electrotechnical Society, 2019, 34(zk1): 352-359.
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2019, Vol. 34 
