多直流馈入受端电网严重故障后的主动解列策略

随着特高压交直流互联电网的快速发展，极大地增强了大范围资源优化配置能力，但在极端故障情况下，电网存在全网性暂态失稳的风险。为了最大限度地保障电网失稳场景下局部重要负荷分区不间断供电，主动解列是一种有效的控制措施。针对多直流馈入的受端电网，分析了交直流故障下全网性的暂态失稳场景，并由失稳特点提出主动解列的应对策略，从判据设置、解列断面的选择原则及追加紧急控制等方面对主动解列策略进行阐述，并通过实际电网仿真算例验证了所提策略的有效性。

Active Splitting Strategy of Multi-infeed DC Receiving-end Grid with Severe Faults

The rapid development of high-voltage AC-DC interconnected power grid greatly improves the large-scale optimal allocation capability of resources in China. However, under the circumstances of some extreme faults, there exists the risk of transient instability of the whole power system. To maximally guarantee the uninterruptible power supply of local important load in the instability mode, the active splitting is considered to be an effective control method. In view of the receiving-end grid with multi-infeed DC, the scenarios of transient instability of whole power system under AC/DC faults are analyzed, and corresponding active splitting strategies are proposed according to the instability characteristics. The active splitting strategies are described from the aspects of the active splitting criteria setting, selection principles of active splitting surfaces and the additional emergency control. Simulation results of an actual power grid also prove the validity of the proposed active splitting strategies.