Double Layer Optimization Research On Wind Solar And Water Storage Multi Energy Complementary Power Generation System

In recent years,with the promotion of the "dual carbon" target,new energy industries such as wind power and photovoltaics have entered a stage of high-speed development.The large-scale integration of new energies into the grid has brought great challenges to traditional power grids and reduced the reliability of power supply.In addition,the integration of new energies has caused resource waste and led to the abandonment of wind and solar energy due to issues such as power quality.These problems have put higher demands on the operation of power generation systems:it is necessary to ensure the reliability of power supply,improve the absorption level of wind and solar energy,and minimize the system’s carbon emissions.To address these issues,this article proposes a multi-energy complementary wind-solar-water storage power generation system that combines pumped storage,battery storage,and hydrogen storage,and studies the optimization and economic coordination of the system’s capacity configuration and operation.The main research contents are as follows:Firstly,based on the characteristics of various power generation and energy storage technologies,the basic structure,principles,and operation process of the multi-energy complementary wind-solar-water storage power generation system are presented.The complementary characteristics of wind and solar resources are analyzed to provide theoretical support for the system’s construction.In addition,a brief introduction is given on wind power generation technology,photovoltaic generation technology,pumped storage,battery storage,and hydrogen production by electrolyzing water technology.The mathematical models of each power generation unit are briefly described,laying a theoretical foundation for the subsequent research on system configuration optimization and coordinated operation.Secondly,based on the wind-solar-water multi-energy complementary power generation system proposed in this article,a two-level optimization model was constructed for the configuration optimization and coordination operation of the system,with the economic efficiency of the system as the objective and considering various constraints comprehensively.The upper-level model aimed to optimize the capacity configuration of each unit in the system with the goal of achieving the optimal economic performance of the system throughout its lifecycle.The lower-level model aimed to fully utilize the peak-shifting capability of energy storage and achieve optimal economic operation of the system within each scheduling cycle.The reliability of power supply was measured by the load shedding rate,while the wind and solar abandonment rates were used as measures of the system’s wind and solar energy consumption levels.The KKT conditions and Big-M method were used to convert the two-level nonlinear model into a single-level linear mixed-integer programming problem,and the simplified model was solved using the CPLEX solver,with the simplification process and solution procedure given.Finally,in order to prove the feasibility and reliability of the model proposed in this paper,the energy storage mode of the system is set up,and three different energy storage schemes are adopted respectively,in order to verify the feasibility of the system and the validity of the model proposed in this paper more effectively.According to the actual data of a certain place in the northwest,the three schemes are simulated in Matlab.The simulation results show that the combination of pumped storage,battery energy storage and hydrogen energy storage can improve the economy of the system and the consumption level of wind and solar power generation under the condition of effectively meeting the power load.