Study Of Multi-objective Decision Method On Hydraulic And Hydro-power Planning Schemes

Because hydropower project is a complex system integrated many factors, with influences on wider scale and lasted for a long time, engineering scheme selection should be double cautious. Combining the multi-objective decision-making theory with the characteristics of water conservancy and hydropower projects, in this paper, the project scheme decision-making influence factors , decision index system for evaluation model building, the construction of the system and its application has been studied. Summarized as follows:(1) Establishment of water conservancy and hydropower engineering plan decision-making index system .This paper systematic analyze the influence factors of hydropower project program planning about technique, economic benefit, natural environment, social environment and risk , and determined influence factors of the water resources and hydropower engineering scheme in planning, then established the water conservancy and hydropower engineering plan decision-making index system .Thereby, this study created the basic conditions for the further research of hydropower engineering scheme multi-objective decision-making , and ,the comprehensive decision-making work of hydropower engineering plan can be standardized and programmed .(2) Quantification and standardization of assessing index. Because hydropower project is a complex system integrated many factors, with influences on wider scale and lasted for a long time, and the most impact factor are difficult to collect or difficult to directly quantitative calculate, so many indicators can only qualitatively descript and summarize. In order to make these qualitative indexes, this paper uses set-valued statistics to rally different experts on this index's evaluation opinions, introducing the fall of set-valued statistics to qualitative indexes more objectively and realistically ; Plus, because of the attribute and features of every index are not identical, no comparable, indexes need be normalized before comprehensive optimization .This article chooses the linear non-dimensionless method to solve the unified problem, named Range transformation method. The basic idea is that the best attribute values are normalized into 1 , the worst property values are normalized into 0, the rest of the property values were using linear differential value method to get its standardization value.(3) The establish of multi-objective decision-making model of hydropower project planning scheme based on vague set theory. Based on the analysis of the advantages and disadvantages of subjectively and objectively weighting method ,this paper determines the index's subjective weight by using Analytic hierarchy process (AHP), then calculate objective weight of the indexes by using entropy method to correct the index's weight. This method take both the subjective experience of policymakers and experts and the rules information of objective data and material into account ,overcome the single weight's one-sidedness, is a kind of comprehensive method fusing of subjective with objective. Schemes comprehensive decision-making use vague set multi-objective decision-making method based on the Euclidean norm, this method is fully considers the the information of membership, the non- membership and hesitation degrees, in processing the information of fuzziness and uncertainty has stronger ability, better and more accurately express fuzzy information, and has more flexibility and practicability.(4) Case study. To test the feasibility and rationality of the theory and method, this article will introduce the formation of the theory into Zhanghewan hydropower project, the Zhanghewan hydropower project program is optimized.