Optimal Operation Method Of Pumping Station With Adjustable-blade Considering The Start-stop Loss

The uneven spatial and temporal distribution of water resources in China has seriously affected the sustainable development of social economy.The optimal operation of largescale inter-basin water transfer projects can effectively improve the utilization efficiency of water resources and save operating costs.In this paper,the research on the optimal operation method of pumping station considering the start-stop loss has practical significance and application value.The main results of this paper are as follows:(1)Research on optimization method of single unit considering start-stop loss.In this paper,the objective function is to minimize the sum of the energy consumption cost of the single unit pumping station and the loss of start-stop.The blade placement angle and the start-stop state of the pumping station are taken as the double decision variables,and the total amount of the pumping station,the start-stop scheme and the power are taken as the constraints.The mathematical model of the operation optimization of the single unit pumping station with blade full regulation is constructed.According to the characteristics of quantitative(blade placement angle)and qualitative(start-stop state variables)of the model,a combined optimization algorithm of test optimization and 0-1 integer programming is proposed.Taking the pumping station of the eastern-route of the South-to-North Water Diversion Project as an example.The application results show that the operation cost is 32,900 yuan when the start-stop of a water transfer process is not more than 3 times,which is optimal.At the same time,this paper also uses genetic algorithm to carry out a comparative study of optimization methods.For the optimization problem with the constraint of the total amount of water in the specified time,the method proposed in this paper is more applicable.(2)Research on optimization method of multi-unit same model considering start-stop loss.In this paper,the minimum sum of the energy consumption cost of multi-unit pumping station operation and the loss of start-stop is taken as the objective function.The blade placement angle and the number of start-up units at different stages are taken as the decision variables,and the total water volume of the unit,the number of start-stop and power are taken as the constraints.The mathematical model of multi-unit pumping station operation with full blade regulation is constructed.An experimental-integer programming combinatorial optimization algorithm is proposed.The application research on the optimal operation of five units of the same type in the pumping station shows that in the process of a water diversion,within the range of less than 3 times of start-stop of a single unit,the unit water-lifting cost increases with the increase of the total amount of water lifted in a single operation time,and decreases with the increase of the number of start-up and shutdown constraints.When the start-stop constraints of a single unit in a water transfer process are 3 times,the optimal operation is achieved.At the same time,this paper also uses genetic algorithm and whale algorithm to compare the optimization methods.(3)Research on optimization method of different types of multi-unit considering startstop loss.In this paper,the mathematical model of different types of multi-unit pumping station with full blade regulation is constructed.A large system decomposition-dynamic programming aggregation optimization algorithm is proposed.The application research of optimal operation shows that the continuous start-up of a single unit in different types of units can reduce the number of start-ups and stops.At the same time,the operation cost is reduced,the vibration during start-up and stop is reduced,which is conducive to the safe operation of the pumping station.When the target water volume is large,it is recommended to issue instructions in advance and arrange water lifting tasks,which is conducive to reducing energy consumption.At the same time,the large system decomposition-dynamic programming aggregation method is applicable to the same type and different types of multiunit variable angle problems.(4)Design software of pumping station optimization operation.Based on Visual Basic software and Android application,the computer module and mobile terminal software for optimal operation of pumping station are developed.The system can realize the following functions:after the user types the constraints such as the total amount of water extraction and the number of start-ups and shutdowns,and selects the optimization method as needed,the optimal operation scheme of Jiangdu No.4 Station under different water extraction combinations can be obtained on the PC side and the mobile side,that is,the blade angle,start-up state,flow rate,water amount and minimum water extraction cost in each period.