Study On Multi-objective Joint Operation Of Reservoir Groups For Ecology,Navigation And Hydropower Generation

With the development of research in the field of hydropower energy in China,the traditional scheduling models have been unable to satisfy many benefits such as reservoir flood control,power generation,water supply,ecology and navigation.At the same time,it is affected by many factors such as social and economic development and changes in the ecological environment of the river basin.There is a series of key scientific problems to be solved in the joint optimal scheduling technology of the reservoir group.This article closely combines the practical application of the joint optimal scheduling project of cascade reservoirs in the Yangtze River Basin,with the goal of optimizing the comprehensive benefits of hydropower development and utilization.The research uses modeling methods combining hydrodynamic theory and fuzzy logic inference system,and deeply analyzes the quantitative methods of ecological objective and navigation objective.Furthermore,the multi-objective optimization theory and its solution algorithm are used to solve the midlong term joint optimal scheduling problem of cascade reservoirs.The research has achieved a series of research results with theoretical significance and practical value in engineering.The main conclusions research and innovation results are as follows:(1)The research work focuses on the ecological and navigation problems faced by the Three Gorges-Gezhouba cascade reservoir,by constructing a hydrodynamic model to simulate the spatial and temporal distribution of the hydrodynamic factors that affect the spawning of target species and affect navigation.At the same time,a fuzzy logic inference system is introduced to calculate the non-linear mapping relationship between hydrodynamic elements and ecological habitat suitability and navigation suitability,and then the requirements of ecological water demand and navigation water demand of the river reach are obtained.(2)Aiming at the constraints of complex decision variables and multi-objective functions for optimal scheduling of reservoir groups,a multi-objective tangent algorithm is proposed by studying multi-objective theory.The multi-objective tangent algorithm uses a new individual update strategy,and through a series of standard test function numerical simulation tests compared with the classic algorithm performance indicators,showing that the multi-objective tangent algorithm can effectively deal with non-continuity and non-convex multi-objective optimization problem,and the results have good convergence and distribution.It is a multi-objective optimization algorithm with excellent performance,which can be used to solve actual scheduling problems.(3)This paper establishes a multi-objective joint optimization scheduling model for reservoir groups oriented to ecology,navigation and hydropower generation.Through solving the scheduling model,the relationship between power generation benefit,ecological benefit and navigation benefit is explored.At the same time,the scheduling optimization schemes are given for the reference of scheduling decision-makers.The optimization of the actual scheduling plan will provide a reference for the future water resources planning and management of the Yangtze River Basin.