Abstract:In order to solve the problem of day-ahead scheduling mode transformation brought by the deepening reform of the spot market and auxiliary service market, a day-ahead scheduling optimization method considering the combined clearing of electric energy and auxiliary service is proposed. Firstly, the coupling relationship between electric energy and reserve auxiliary service is analyzed, and the operational constraints to be considered in the joint clearing of electric energy and standby are clarified from the two dimensions of unit operation characteristics and power network carrying capacity. Then, taking the lowest comprehensive power purchase cost as the optimization target, and considering the constraints of power network operation, power balance and unit operation, the day-ahead dispatching optimization model of combined power and standby auxiliary service clearance is constructed. According to the characteristics of the model, the solution method is put forward. Finally, a case study based on the actual data construction of a provincial power grid in China shows that this method can effectively improve the efficiency of power generation resource utilization and avoid the problem that the scalar quantity in the generator sets exceeds the load capacity of the system or the generating capacity of the generator sets caused by standby equalization.