Abstract：Due to the low line impedance of the DC power distribution system, the current rise rate is high when the line is short-circuited, which causes problems such as difficulty in current limiting and slow recovery of line equipment. This paper analyzes the current problems in the current-limiting reactance method used in DC distribution networks, and proposes a new method for active current-limiting control of short-circuit current using power electronic transformer equipment in the distribution network. The improvement of the circuit topology and the active current control method can realize that the energy in the internal support capacitor of the converter no longer produces a large impact on the line when a short-circuit fault occurs, and can quickly track and control the current in the distribution network line. Renewable energy power generation equipment achieves current control requirements during low voltage ride-through. Hardware-in-the-loop experiments verify the correctness of the method in this paper.
卓超然, 张笑天, 张雄, 杨旭. 支撑电容可分离的直流变压器短路故障电流限流控制方法[J]. 电工技术学报, 2022, 37(2): 424-432.
Zhuo Chaoran, Zhang Xiaotian, Zhang Xiong, Yang Xu. Short-Circuit Fault Current Limiting Control Method of DC Transformer with Separable Supporting Capacitor. Transactions of China Electrotechnical Society, 2022, 37(2): 424-432.
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2022, Vol. 37 
