Abstract：There is a large proportion of thermal power units in power system of our county. Meanwhile, load and difference between the peak and vale in the power grid have become greater, which will increase the operation costs of power system. So the economic security of power system and reasonable scheduling of units need to be paid more attention. Pumped storage station has unique operating mode of pumping and power generation to take advantage of pumped storage for peak load shaving. It achieves power load regulation and a safe and stable operation of power system. It is also an effective regulatory tool of modern power system. This paper sets up mathematical model of optimal scheduling of power system including pumped storage. The mixed integer programming method has been adopted. Combining with the unit operation of economy and safety, it considers multiple constraint conditions. It treats the minimum cost of power generation as the objective function. In this paper, one example of the 10 thermal power units and a pumped storage unit carries on the simulation calculation. It compares and analyzes power generation costs and Power generation situation of thermal power system before and after joining pumped storage. It study thermal power generation system adding the capacity benefits of pumped storage, and reflects the function of peak load shaving of pumped storage station.
Key words ：pumped storage；mixed Integer programming；thermal power system；
optimal Scheduling；peak load shaving