The Yellow River Hydropower Water Reservoirs In The Implementation Of Scheduling And Risk

An important problem lies in the study of the optimizing operation of large-scalemulti-reservoir at present is that the theoretical research divorced from practicalapplication. This paper, combining with the national "ninth five-year" sci-techresearch item, emphasizing on the water dispatching of the main stream of the YellowRiver in non-flood season, starting from the real-operation, deals with themethodology and model of the water dispatching. Also, such problems as iceprevention and run-off propagation and the risks in the water dispatching in non-floodseason are studied systematically and deeply in the paper. The aims of this paper arestudying and presenting the multi-reservoir operation model modified progressivelywith run-off forecast and the plan of using water,as well as presenting the evaluationtechnology for the operation risk.Thus, may be applied practically in the operation ofhydroelectric stations on the main stream of the Yellow River, so as to providetechnological support for the uni-management of the Yellow River water resources. The main results of the paper are as follows:(1) Study on the basic problems of the water dispatching. By means of thestatistical analysis of data, the effect of the water storage of the river channel in iceseason on the balance of the water quantity is studied, and the model for forecastingwater storage of the river channel between Ningxia and Neimonggol is established;Water losses of the main reaches of the Yellow River is analyzed by using water balancemethod.(2) Research on the run-off propagation. Using the method of the hydrologicalsimulation according to Muskingum's equation, the paper deduces the water propagationformula in the case of △t>K, and gives the meaning and using condition of the formula;It also presents an empirical paramaterα for the water propagation, studies the relationof α between the month dispatching and the ten-day period dispatching, and gives theoptimal value of α in non-flood season on the upper and middle reaches of the YellowRiver.(3) Research on the operation principle of the upper caicade. By analyzing suchaspects as the property and operation manner of the projects on the main stream ofYellow River and the comprehensive requirements for water, the paper suggests thewater suPPly principle for multipurpose, that is t'Liu reservoir is the first, Long reservoiris the second", which is different from the desigood operation order of the cascade. Thesimulation of the typical year data shOws that: the principle presented is more favorableto the multipurpose use of the main stream prOjects, the Liu reservoir can realize theoperation manner of filling-emPtying twice a year by joint operation of the Liu and Long. freservoir, corresponding to the case of annual regulation caPacity enhanced under thesame prOjects condition, which has great superiority and economical benefits.(4) Study on the operation model. By combining the simulation method with theoptimiZ8ion method, introducing the idea of the system idelltification, the selfiteratveoptimal simulation modal fOr the uPper cascade is set up in the paPer. The model is bulltby adding the three layers of identification feedback structure and objective optimizationstrucbe tO the simulating model, which has stronger simulation caPability and the selfoptimization function. By using the simulation of the measured data of the Water suPPlyseason in l998 and in l999, it shows that the model suggested in this paper is scientfic,the simulation results are reasonable and better than the practical results in electricitygeneration. Waer suPply and alleviation of the flow break in the downstream of theYellow hiver.(5) Re8earcb on tke 8torage of the ice prevention. By the thought of POA, with aimof maximising the minimum outPut of the cascade, the method of optimizing StOrage fOrice Prevention is presented through change of the limited water level of the reservoir at...