Standby capacity modeling method and system considering start-stop process of thermal power generating unit

The invention provides a reserve capacity modeling method and system considering the start-stop process of a thermal power generating unit, and the method comprises the steps: obtaining a start-stop coupling control relation between the start-stop action and an operation state, and building an output control model combining the start-stop process with the operation process according to the start-stop coupling control relation; wherein the output control model comprises positive and negative standby constraints; according to the start-stop coupling control relation, establishing a unit operation cost model of the thermal power unit, and according to the positive and negative standby constraints and the unit operation cost model, establishing a standby capacity model of the thermal power unit; solving the reserve capacity model to obtain the operation reserve capacity of the thermal power generating unit so as to adjust the power generation output of the thermal power generating unit according to the operation