At present

in the formulation of the in-plant operation strategy of pumped-storage power plants

there are problems such as not distinguishing the power characteristics of the same type of units

reducing the number of start-stops of the units

and the units working in the near-vibration range.In order to solve the above problems

this paper proposes an operation strategy of units in a pumped-storage power station based on unit combination optimization.On the basis of distinguishing the operating characteristics of units of the same type

optimization is carried out with the goal of minimum water consumption.List the unit combinations in the dispatching period

carry out the priority sorting with the goal of the least water consumption

and filter by the unit start and stop constraints.Based on this

the unit combination scheme in each dispatching period is obtained

and the power allocation of each unit is determined according to the screening results.The simulation results show that the strategy in this paper is effective in reducing water loss and improving the overall efficiency of pumped-storage power stations.