The Study On Cascade Reservoir Shrot-Term Joint Optimized Operation Based On Peak Load

Based on sustainable development energy strategy, China's energy structure has been optimized to alleviate the energy crisis and electricity shortage pressure. With the pace of development of hydropower energy getting more faster,12 large hydropower bases and cascade hydropower station group are formed gradually. Moreover, the electricity market system has been reformed as the separation of plant and network and price bidding.Facing of hydropower planning, development and reform, the opportunities and challenges are brought. However, the situation that low utilization rate of water resources, waste and other abuses are existed. So improving reservoir cascade power generation scheduling theory and applied research emphatically, enhancing the comprehensive utilization of hydropower stations and power generation level of economic efficiency of enterprises, have important theoretical significance and practical significance.In this paper, Xiaolangdi and Xixiayuan, which are located on the middle reaches of Yellow River hydropower energy base and have a flood control, water supply, power generation and other utilization requirements, are chosen as the research object to study hydropower peaking on the operation mode, hydroelectric peaking capacity and short-term optimal dispatching deeply based on hydropower station peak load operation theory, cascade reservoirs optimal dispatching theory and electricity markets theory. The main results to the paper are as follows:(1)Considering the impact of unstable flow when Xiaolangdi hydropower station undertake peaking task, based on the full play of anti-regulation effect of Xixiayuan, hydropower station peaking models are deeply discussed through anglicizing the realization way of peaking task and the short-term application principles and operating mode of peak load of Xiaolangdi and Xixiayuan cascade hydropower stations are presented. (2)According to the short-term operating mode of Xiaolangdi hydropower station, the maximal peak load power model is established to study on the peaking capacity of hydropower station by selecting different programs. Then the tables of short-term peaking capacity of Xiaolangdi hydropower station are made and the main impact factors of peaking capacity are extracted.(3)The short-term optimal dispatching model and optimization algorithm are discussed theoretically based on summering characteristics of short-term generation dispatching. By day, week, month for the dispatching cycle, reservoir conventional dispatching, cascade reservoir short-term joint optimal dispatching and based on the minimum water consumption the optimal load distribution are emphatically studied and maximal cascaded energy output model, maximal cascaded energy efficiency model and minimal water consumption model are established. Then dynamic programming algorithm (DP) and the equal incremental method are selected to solving the model above. Through comparing and anglicizing of the results of various calculations, the anti-regulation ability of Xixiayuan reservoir in cascade joint optimal dispatching are gained to verify the accuracy of the model and algorithm.(4)Combining the actual operation of Xiaolangdi and Xixiayuan cascade reservoirs,using the models established in the paper, cascade reservoir short-term generation scheduling, peaking generation scheduling and the optimal load distribution scheduling are made. By comparison with the actual operation, the calculation results of the model in practical application are verified. At last, the practically, stability and reliability of short-term optimal dispatching model are verified from a practical running point of view.