A Study On Load Distribution And Energy Storage Operation Chart For Multiple Hydroplants

With a large number of cascade hydropower developed in our country and the management pattern of the joint operation formed,the joint operation for large-scale cascade hydropower stations is faced with all kinds of problems.Recently,solving ability of existing optimization method is limited,especially in solving large-scale complex cascade hydropower system,which leads to difficult to solve and the quality of solutions is had to ensure.Also,The uncertainty of reservoir runoff leads to the optimizing scheduling model is difficult to use in the actual scheduling.Thus,in order to meet the demand of joint operation for cascade hydropower system,and improve the comprehensive economic benefits of the cascade hydropower system,it has a certain theoretical and practical value to research cascade scheduling theory of conforming to the actual needs.The study about joint scheduling rules of cascade hydropower stations mainly around the determination of cascade total output and the allocation of total output in the cascade hydropower stations.In this paper,a problem about the allocation of total output in the cascade hydropower stations were studied.The main work in this paper is as follows:(1)According to the actual situation of the research question to choose reasonable optimization scheduling rules,a cascade storage energy maximum model is established.Then,it expounded the basic principle of discriminant coefficient method about solving this model,and analyzed the advantages and disadvantages of discriminant coefficient method.In order to overcome the existing shortcomings of discriminant coefficient method,the method of coupling water storage rate and discriminant coefficient is developed to solving the model,and the feasibility of the allocation methods are analyzed theoretically.(2)Develop cascade joint operation rules.Combined with the cascade load distribution method,the method of drawing the cascade storage operation chart is studied.By using the historical runoff data of the actual engineering to simulate the operation,the simulation results are compared between the existing discriminant coefficient method and the load distribution method proposed in this paper.Not only the annual average generation and assurance rate is promoted,but also surplus water is reduced.So the load distribution method proposed in this paper is reasonable,feasible,practical and superior.(3)In order to improve more compensation benefits in joint operation for cascade hydropower system,the Progressive Optimization Algorithm has been used to optimize the initial cascade energy storage operation chart.From the aspects of average annual power generation,average annual surplus water and assurance rate,the contrast and analysis of the before and after optimized cascade energy storage operation chart are provided in the final.