Study On Conjunctive Operation Of Sanxia Cascade Reservoirs And Qingjiang Cascade Reservoirs

Resources of hydroenergy of our country are distributed space-time inequality, not merely the much compensation benefit exists between reservoir groups, there is great complementary benefit between hydroelectricity and electricity generation by thermal power . In order to coordinate the nonconformity between incoming water and using water on time and space distribution, unify contradiction and interests of every unit in the power station of reservoir group, it has very important meaning to schedule effectively and rationally on reservoir . The optimization operation of reservoir group of power station is a much complicated question about large-scale system, and involves in describing and simulating its own physical characteristic and the characteristic of management with its related electric network. The study on its theory and method remains the focus of this field at present. Seeing that time restricts, this paper carries mainly on research on the physical characteristics of optimizing operation of reservoirs of power station. Adopting the systematic thought, proceeding from the whole benefit, studying conjunctively optimized operation targeting at hydroelectric station group ,is to make every reservoir consider other reservoirs' operation decision while fully utilizing its hydropower resource, and send the electric energy which meets the demand of power supply reliability as much as possible to the electric network.It not only increases the competition of hydroelectricity market, realizes the optimizational distribution of resources , but also insists on the principle of sustainable development, implements the national energy policy , it is a multi-win strategy. So, it remains the focal point in the reservoir operation works that strengthening the optimization operation in the reservoir and fully utilizing hydroenergy resources in the future.The main purpose of the paper is carrying on research on reservoir groups of operation problem through analyzing the general research and development situation of reservoir groups operation home and abroad a,combining the actual conditions of Sanxia cascade and Qingjiang cascade reservoirs and on the basis of fully considering generating electricity , preventing flood , shipping and other required water . Under thesame calculating terms and having adopted the compared method , the results of separated cascade and system conjunctive operation are calculated. The feasibility and key measure of conjunctive operation are discussed by analyzing compensation benefit. On the basis of getting the satisfying long-time optimizing operation tactics of the reservoirs, the method of setting up operation function of reservoirs is discussed in order to guide operation of reservoir.The paper is divided into six chapters:In chapter 1,exordium. Put forward the question. Reservoir operation is all-sidedly expatiated from reservoir operation's task , principle , content, classification, and methods of the reservoir operation, and reservoir (group) operation research overview and development trend ,etc. The purpose , meaning and research contents of the thesis are all established.In chapter 2, optimizing operation of Sanxia cascade. After introducing the basic cases of Sanxia cascade, the long-time optimizing operation mathematical modle is developed .The two objects are maximum energy output and minimum firm power. Corresponding solution is given by transforming the object of minimum firm power to constraint condition and dispersed differential dynamic method is applied to solve transformed model and get satisfying long-time optimizing operation tactics of Sanxia finally.In chapter 3, optimizing operation of Qingjiang cascade.Based on the algorithm and thought of optimizing operation of Sanxia,the optimizing operation modle of Qingjiang cascade reservoirs is set up and optimizing operation result is given too . Because Qingjiang cascade reservoirs is three series connection reservoirs, two-dimentional dispersed differential dynamic is adopted to solve the modle.In chapter 4, conjunctive operation of Sanxia cascade reservoirs and Qingjiang cascade reservoirs. Targeted at the maximum energy output and minimum firm power, of system, jointly optimized module of Sanxia cascade reservoirs and Qingjiang cascade reservoirs is set up. According to the basic principle of the decomposition-coordination of the large scale system, the system is divided into the subsystem of Sanxia cascade reservoirs and the subsystem of Qingjiang cascade reservoirs. And the optimum solutionof subsystem is got by method of discrete differential dynamic programming, then the optimum solution of system is resolved by means of conjunctive optimization of the two subsystems utilizing the decomposition-coordination model. Finally, the consequence with chapter three and chapter four are compared and the compensation benefit of conjunctive operation is analyzed from three respects of electricity, quantity of electricity and shipping are analyzed. The results show the changing course and rationality of various kinds of main operation parameters and indicate that it is considerable for compensation benefit. The result is rational and believable.In chapter 5, applying BP neural network to solve reservoir operation function. Based on deep analysis of the current study trends of reservoir operation function and various factors which affect it, the operation function of reservoir is established by utilizing the optimal dispatching results and back-propagation neural network method.The process applying BP neural network is explained by the example of San reservoir and the results are cheched .In the end there is a summary for the whole paper and suggestions for the further study.