grid stability;  power balance;  Emergency load control

Load control is a traditional means adopted to maintain transient stability when the power grid is disturbed. Emergency load control needs to solve four problems: system power stability, frequency stability, voltage stability, and line load. By comparing with the traditional stability control calculation control method, an emergency load control based on power balance protection is proposed. The implementation principle is: when there is a sudden change in the exchange power between the regional power grids, the power balance requirements after the disturbance are formulated according to the power balance state of the regional power grid before the sudden change, and the load of the system is urgently adjusted after the occurrence of the large disturbance, and the selection and setting method of the emergency load control in terms of time and control points are given.