一些不可预见的因素可能造成电网瓦解,主网内的所有机组解列或停机,线路跳闸,厂用电消失。针对极端状况,电网恢复需分区、逐次起动;区域电网起动前提,需要黑启动电源支持。文中针对电网极端情况,就一个水电站由外部因素引起全停,即全站失去交流电,讨论机组黑启动能力,以及向所属区域电网提供黑启动电源的能力。 Some unforeseen factors may cause the power grid to collapse. All units in the main grid will be disconnected or shut down, the lines will be tripped, and the power consumption of the factory will disappear. For extreme conditions, the grid restoration needs to be zoned and started one by one. The prerequisites for regional grid start-up need black-start power supply support. In the paper, in view of the extreme conditions of the power grid, the stoppage of a hydropower station caused by external factors, ie, the loss of AC power at the station, the black start capability of the unit and the ability of providing black start power to the power grid in the area.