Multi-objective Scheduling Method of Cascade Hydropower Stations Based on Improved NSGA-Ⅱ Algorithm
In recent years,the suddenness,extremeness and abnormality of regional rainstorm and flood disasters have been significantly enhanced,and the uneven spatial and temporal distribution of runoff during the year has been fur-ther aggravated.The task of balancing flood control and benefit in the flood season dispatching of cascade hydropower stations has become an important research topic.In this paper,a solution method based on NSGA-Ⅱ algorithm is pro-posed to solve the problem of multi-objective joint dispatch of cascade hydropower station,which improves the population generation strategy and elite selection strategy of NSGA-Ⅱ algorithm.The flood control risk function was defined as the average flood control capacity occupancy of each station period,and the profit objective function was defined as the annual power generation of the cascade.The Pareto frontier analysis method was used to solve the joint scheduling problem of cascade hydropower stations with flood control and profit objective functions.Finally,the example of taking the joint op-eration of cascade hydropower stations under the condition of multi-year average inflow of cascade hydropower stations in a river basin verified the algorithm.The results show that the multi-objective scheduling method of cascade hydropower stations based on improved NSGA-Ⅱ algorithm can meet the requirements of flood control scheduling of cascade hydro-power stations in flood season.The annual power generation of cascade hydropower stations is 2.7%higher than that of the common scheduling method.The comprehensive benefits of cascade hydropower stations have been better brought into play.
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