Abstract
Positive and negative voltages/currents may present long-term unbalance after single-pole breakage faults in ring flexible DC distribution networks, which endangers the safe and stable operation of the system, whereas little research on it has been implemented. Therefore, characteristics of the single-pole breakage fault are studied. First, by establishing the equivalent model of the system before and after the fault, the voltage and current characteristics of the single-pole breakage fault on the DC line, the tie line between the sending-end converter and the DC bus, and that between the receiving-end converter and the DC bus were analyzed. Then, the influence of system grounding mode on the characteristics of the single-pole breakage fault was discussed. In addition, the impact of sudden load change on the fault characteristics was studied. Finally, the model of a ring flexible DC distribution system was built in PSCAD/EMTDC to verify the theoretical analysis.
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