Research And Application Of Optimal Scheduling Of Cascade Reservoirs In The Lower Reaches Of Jinsha River

At present,global warming,energy shortages,environmental pollution and other issues have become the focus all over the world.Therefore,how to promote the development of new energy and renewable energy is the key to solve the energy problem and ease the environmental crisis.As a clean energy with high utilization rate,hydropower bears the responsibility of flood control,power generation,peak shaving,shipping,water supply,ecological regulation and so on.Hydropower plays an important role in the development of China's energy industry.With the establishment and operation of large-scale reservoirs,how to realize the rational allocation and the efficient utilization of water resources and how to realize the balanced optimization of each scheduling target under the premise of flood control safety,have become the impotant scientific problems of the academic research and engineering application.Based on the actual operation situation of resources in the lower reaches of Jinsha River,this paper combines the theory of optimal allocation of water resources,the method of system science and the method of multi-objective benefit equilibrium optimization to study on modeling theory and solving strategy,and further,provides effective theoretical support for guaranteeing water security and increasing water resources utilization.Related research results have now been applied at the control centers of The Jinsha River Cascade.The main content of the innovation and contribution in this thesis are listed as follows.(1)In order to obtain the efficient solutions of multi-objective optimal scheduling problem of reservoirs in the lower reaches of the Jinsha River,this paper introduces the non-dominated sorting genetic strategies to improve the gravitational search algorithm framework,and puts forward the modified gravitational search algorithm based on non-dominated sorting genetic strategy.In the proposed algorithm,the non dominated sorting strategy and the reference point selection mechanism are used to guarantee the diversity of the population,and further,the chaos mutation strategy is used to improve the process of population evolution.Then,the standard test functions are used to test the performance of the proposed algorithm.The test results of functions show that,the proposed algorithm can be used to solve the multi-objective optimization problem with multi-dimension,non convex,nonlinear,discontinuous and complex constraints,efficiently.(2)In order to give full play to the comprehensive economic benefit of reservoirs in dry season,this paper uses the historical runoff data to refine the law of runoff variation,and establishes the joint optimization scheduling model of cascade reservoirs in dry season.The proposed model is used to study the method of water level fluctuation in drought period,and the proposed parallel computing technology as well as the proposed MGSA-NSGA-III are applied to solve the model.Then,the optimal methods of water level fluctuation under different water inflow frequencies are proposed.The research shows that,the methods presented in this paper can significantly improve the cascade total power generation and the efficiency of comprehensive utilization of water resources,and then,provide an effective reference for the optimization scheduling of cascade reservoirs in the lower reaches of Jinsha River.(3)To ensure the safety of downstream flood control objects in flood season,this paper analyzes the advance of freshet and flood control operation theory deeply,and then,establishes the single-objective and multi-objective compensating flood control scheduling model for two kinds of cascade reservoirs,to minimize the utilization of flood control capacity.Then,the proposed parallel computing technology and proposed MGSA-NSGA-algorithm are used to study the combined compensating flood control of the Xiluodu,Xiangjiaba and Pubugou reservoir for Chuanjiang River.Finally,through the analysis of flood control demand of the coastal city of Chuanjiang River(Yibin,Luzhou,Chongqing),the paper puts forward two compensating flood control categories of Xiluodu.Xiangjiaba and Pubugou reservoirs for ensuring flood control standard and warning flood control standard,respectively.The research results are expected to provide an effective reference for compensating flood control plan.(4)In order to give full play to the comprehensive operation efficiency,this paper analyzes the shipping status and scheduling rules of the channel from downstream of Xiangjiaba to Yibin,studies the effect of runoff on shipping efficiency based on the existing shipping dispatching rules,and proposes the evaluation method of shipping benefit.Then,this paper builds cascade multi-objective optimization scheduling model considering both the benefit of compensating flood control and the shipping efficiency,and the proposed model is applied to study the compensating flood control and shipping scheduling of Xiluodu,Xiangjiaba and Pubugou reservoirs.The research results can effectively promote the comprehensive benefits of compensating flood control and shipping scheduling of Xiluodu-Xiangjiaba cascade reservoirs.