Research And Application For Daily Generation Scheduling Of Cascade Hydropower Stations

It gives priority to the development of hydropower in the twelfth five-year plan forpower industry, which plans for the Yangtze River water power base of the southwest andthe upper reaches. Hydropower development and joint optimal dispatch of basin cascadeare important way to coordinating upstream and downstream power plant. It can make fulluse of hydropower resources and achieve energy conservation. However, the jointoptimization of scheduling is very difficult because topological structure of cascadehydropower station and contact of water conservancy and electricity are complex. At thesame time, random changes of the load and runoff of power station bring greater securityand stability to the grid. Therefore, it’s need to carry out joint optimal dispatch ofhydropower cascade, especially for short-term optimal scheduling. It can response rapidlyto mutations of load and runoff, and improve the benefit to water and head, stability ofgrid and reliability of power supply. The daily generation plan is an important research ofhydropower short-term optimal scheduling. It’s the next day load curve in the power plantthat obeyed by Automatic Generation Control (AGC) or operating personnel under modeof power control. It is a plan decomposition to day which is three FM of power system andthe program of long term optimal scheduling. The accuracy is essential for security andstability of the power system.Firstly, the business relationship between the scheduling departments is introduced inthe paper. The role played by the various departments in the daily generation scheduling isclarified and the importance of the various engineering problems for various departmentsin the preparation process is researched. Secondly, the shortage of the traditional methodof power generation plan analyzed in the paper. Such as, accuracy is not high and unableto achieve optimization. These cause practical engineering problems like the dailygeneration schedule can not be performed and the deviation of actual load and programload is large. Then, generation scheduling model is established by analyzing influencingfactors of cascade hydropower stations generating program, inflow, water requirements,the water level of cascade, a typical power grid load and unit state. The number of the started units is determined reasonably. The water between the power-generating units isassigned by using particle swarm optimization algorithm. The defects of the conventionalpower generation schemes are overcomed and the precision of the cascade day powergeneration plan is improved. The model is applied to the Three Gorges-Gezhoubacascade.The practical problems of model in the application of the cascade and the specificalgorithm are researched in paper. The superiority of method which put forward in thepaper is get, compared to traditional methods. At last, daily generation planning modulefor the Three Gorges cascade is developed, whose functions of data input, boundarysetting, adjustment of the typical load curve and optimization are achieved.The optimization method for daily generation planning is established in the study,which improves the accuracy of power generation plan. It can reduce the deviation of theplanned load and actual load, And it can reduce the capacity of the secondary FM adjust.Also, it can provide effective technical support for power system stability and efficientoperation.