| Combined with actual situation of cascade reservoirs in Hanjiang river and considered comprehensive utilization requirements of cascade development, the development and utilization problems of power generation and shipping in cascade reservoirs of the upper Hanjiang river are studied in this paper. Firstly, restricted relationship among objects of comprehensive development and utilization of cascade reservoirs in the upper Hanjiang river is analyzed especially the contradiction between power generation and shipping. Then, water demand of power generation and shipping is planned. Model and solving method of reservoir optimal operation in main stream of Hanjiang river are proposed. The aim is to coordination the contradiction between power generation and shipping and find out water resources allocation scheme which meets the requirements of power generation and shipping and maximum comprehensive benefits in order to provide scientific bases to decision department. Main contents and research achievements of the paper are as follows:(1) Based on present situation of water resources comprehensive development and utilization in Hanjiang river, relationship among development objects of cascade reservoirs in Hanjiang river is analyzed and coupling methods of different object are proposed in this paper, which lay foundation for building of operation model.(2) In view of prominent contradiction of power generation and shipping, criteria of cascade operation of Hanjiang river are proposed on the basis of object coupling. Then, models are built including joint optimal operation model of power generation and shipping of cascade reservoirs in Hanjiang river and self-iteration simulating model. In order to guarantee general acknowledgement and precision of solving method, the method of combining decomposition and coordination of large scale system and PSO is used in optimal operation model, which ensures calculation precision and solving speed of models. Solving steps of simulating model are also given in this paper. (3) In order to get water resources allocation scheme of maximum comprehensive benefits of power generation and shipping, four operation schemes are drafted on the basis of present situation of cascade development, respectively is recent three cascades considering and not considering shipping, long-term seven cascades considering and not considering shipping. Joint optimal operation model of power generation and shipping of cascade reservoirs in Hanjiang river and self-iteration simulating model are applied to solve. Indexes of operation results are analyzed including average annual energy output, shipping guarantee efficiency and power guarantee efficiency. The aim is to find out water contradiction and solving methods of power generation and shipping.(4) Calculation results of each scheme indicate that: During resent three cascades optimal operation or long-term seven cascades optimal operation, basic load output of each power station increases after considering shipping water and peak-load regulation capability of cascade power stations decreases. Nevertheless, whether considered shipping water or not, shipping will have very little effect on average annual energy output and annual power guarantee efficiency of cascade power stations and shipping guarantee efficiency increases remarkably, which brings obvious economic and social benefits. Compared joint operation of seven cascade reservoirs with that of three cascade reservoirs, the former can further develop advantages of reservoir joint operation and make electric quantity peak-load regulation output and shipping guarantee efficiency larger.
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