Wide area load shedding control method for quiescent voltage stabilization considering external power grid equivalence

The invention provides a wide area load shedding control method for quiescent voltage stabilization considering external power grid equivalence, belonging to the technical field of quiescent voltage stabilization analysis and control of electrical power systems. In the method, by using programs, a computer is used to calculate the Thevenin equivalent circuit of an external power grid, calculate quiescent voltage stability margin of an equivalent system, and solve a minimum load shedding optimization model so as to obtain a wide area load shedding scheme for a local power grid. Under the condition of unknown external power grid information, the method can be used to exactly calculate the quiescent voltage stability margin of the local power grid only relying on internal power grid information, and formulate a reasonable and effective wide area load shedding scheme for the local power grid. The method has the advantages of high calculation accuracy, fast optimization speed, strong engineering applicability and the like. The method provided by the invention is widely applied to the quiescent voltage stabilization wide area load shedding control of the local power grid connected with the external power grid by single points, particularly the quiescent voltage stabilization analysis and control of the local power grid by hierarchical and zoning management and schedule.