Research On Optimal Operation Of Small Cascade Hydropower Stations Based On Secondary Water Allocation

The hydropower resources are very abundant and play an important role in energy structure in China.In the case of the growing energy shortage all over the world,the development of hydropower construction becomes an inevitable choice of the energy strategy adjustment in China.The full use of hydropower resources can improve the ecological environment and improve social and economic benefits.After years of development,the small hydropower station has become an important foundation for the economic and social development of rural areas in China.To carry out consolidated management and joint scheduling for small cascade hydropower stations,it is possible to improve the utilization efficiency of hydropower resources,and small cascade hydropower stations can markedly increase the generation capacity of cascade hydropower stations.This paper first illustrate the current research status and future trends of hydropower development in China,analyzes the existing problems in the optimization of hydropower station.What ' s more,fundamental theories and mathematical models of the leading reservoir cascade hydropower station are summarized.Based on this,the secondary water allocation model of cascade hydropower station is put forward and the concrete steps of dynamic programming to solve the model are introduced in detail.At the same time,the system development of secondary water allocation for cascade hydropower stations under the monitoring platform is discussed.Finally,the small cascade hydropower station is chosen as an example for model validation.The main contents of this paper are summarized as below:(1)The small cascade hydropower station of leading reservoir is selected as the research object.On the basis of illustration its basic theory and characteristics,this paper summarizes the mathematical model of the long-term and short-term optimal operation of the leading reservoir,the joint optimal operation of the cascade hydropower station and the economic operation of the factory.(2)On the condition of a given power generation water usage,the conventionalwater usage plan is to allocate the water on average or based on experience during the scheduling period.This method can often result in irrational water allocation during the scheduling period.Aiming at these problems,this paper proposes a model of secondary water allocation for cascade hydropower stations on the basis of economic operation in the factory,and illustrate the concrete steps of dynamic programming to solve this model in detail.Through the secondary water allocation,it can eliminate the error between the actual flow and the theoretical flow and increase the power generation benefit of small cascade hydropower station.(3)According to the basic principles of system development and technical support,the module design of cascade hydropower station optimal dispatching system is carried out.The development and realization of secondary water distribution system for cascade hydropower stations under the monitoring platform are explored.This system can automatically realize the secondary water allocation and optimal dispatching and thus improve the automation management level of cascade hydropower station.(4)Taking the Luoning small cascade hydropower station as a research object,the secondary water allocation model of cascade hydropower station is established,and the dynamic programming method is used to solve this problem.According to the calculation results,the model can allocate water more rationally during the dispatching period,eliminate the error between the theoretical flow and the actual flow,and make the optimal operation with the actual operation of the power station.