Method and device for judging dominant instability form of power grid and medium

The invention discloses a method and a device for judging a dominant instability form of a power grid, and a medium. The method comprises the following steps: after a fault of a power grid is removed, identifying key nodes and associated branches of the power grid in a preset time window in real time, and collecting head and tail end parameter data of each associated branch; calculating a discrimination index of the dominant instability state of the power grid in real time according to the head and tail end parameter data of each associated branch; and determining the dominant instability form of the power grid according to a preset dominant instability form criterion and the discrimination index. 本发明公开了一种电网主导失稳形态的判别方法、装置及介质。其中，方法包括：在电网的故障切除后，实时辨识预设时间窗口电网的关键节点及其关联支路，并采集每条关联支路的首、末端参数数据；根据每条关联支路的首、末端参数数据实时计算电网的主导失稳形态的判别指标；根据预先设置的主导失稳形态判据以及判别指标，确定电网的主导失稳形态。