Long-term Multi-Objective Optimal Scheduling Method Of Cascaded Hydroelectric Stations

Optimal scheduling of hydropower station, with a very high input-output ratio, can improve economic administration of hydropower and power system and be an effective means to tap the hydropower potential. With the rapid growth of formation of power market, cascaded hydropower system becomes huger and huger arid demand becomes more and more complexity. So, multi-objective optimization has become an increasingly impotant issue and new theories and methods of decision-making must be continuously studied and explored. This paper focuses on theoretical and practical issues in multi-objective optimal scheduling system of cascaded reservoir, and put forward the corresponding muti-objective optimization model based on the analysis of the characteristics of cascade reservoir multi-objective optimization. At the same time, this paper gives pratical solutions which are integrated with application system and provides some new ways for multi-objective optimization of cascaded hydroelectric stations. The main works are listed as following:(1) For upstream and downstream in the cascade hydropower stations belonging to the coordination of different stakeholders, create a multi-objective optimization mathematical model, and proposed an iterative algorithm based on linear weighted method. The results of case study shows that the proposed approach is suitable for medium-term optimal operation of hydropower stations with multi-stakeholder in centralized control mode.(2) Created a multi-objective optimization mathematical model of balancing the system electric energy and minimum average ouput power for the objective coordination problem of reservoir group optimal generation dispatching, and proposed an iterative algorithm which combined grey correlation method with ideal point method. The results of case study show that the proposed approach is suitable for multi-objective issues of long-term optimal operation of hydropower stations.(3) For a multi-objective optimal scheduling with longer dispatchingcycle, present a caculate method of operational nature. The results of case study show that the proposed approach is feasible. (4) Develop a software system used to implement cascade reservoir group multi-objective optimal scheduling with pratical and research needs of multi-objective hydropower dispatching. Then, introduce design, main function, key technology of the dispatching system.Finally, a summary is given and some problems to be further studied are discussed.