受端交流电网故障时多端柔性直流系统的功率再分配

Power Redistribution of Multi-Terminal Flexible-HVDC System Under Alternating Current Network Fault of Receiving End

对多端柔性直流输电系统中受端交流侧发生故障时的功率再分配进行了研究。通过改变受端非故障侧电压下降控制特性的有功定值,可实现各受端在不过载的情况下的功率再分配。运用PSCAD软件建立了三端柔性直流输电系统模型并进行了仿真,仿真结果表明,提出的控制策略在交流电网故障时可实现功率再分配目标,并能很好地保证系统直流电压的稳定和功率的平衡。

This paper researched on the power redistribution of multi-terminal flexible-HVDC system when the alternating current （AC）side of receiving end was failure. By changing the active power constant value of voltage droop control characteristic at non-fault side ofreceiving end, the receiving end under non overload could realize the power redistribution. The software PSCAD was used to build thethree-terminal flexible-HVDC model and carried out simulation. The results show that the proposed control strategy can realize the objectiveof the power redistribution when the AC network is failure and can keep the stabilization of direct current （DC） voltage and the balanceof system power.