Research On Thermal Performance Optimization Of Multi-energy Microgrid Energy Storage Based On Controllable Load Uncertainty

With the goal of "carbon peak and carbon neutralization",building a new power system with new energy as the main body,maximizing the consumption of new energy as the main task and realizing the goal of "carbon peak and carbon neutralization" has become the primary research direction of power grid construction,development and operation.The large-scale and large-capacity access of new energy to the power grid puts forward higher requirements for the operation and control of the existing power grid.At the same time,with the large-scale application of existing electric vehicles and multi-energy microgrid energy storage technology,the flexible charging and discharging of energy by using electric vehicles and multi-energy microgrid energy storage equipment can further improve the safe and stable operation ability of power grid and give full play to the response and regulation ability of users.However,how to realize the stable and economic operation of multi energy microgrid and large power grid by formulating a reasonable incentive model and considering the regulation capacity and regulation ability of virtual energy storage such as controllable load in multi energy microgrid has become the main problem to be solved.To solve this problem,this paper carries out research on the energy storage characteristics of power grid,heating network and gas network,flexible energy storage characteristics of controllable load and electric vehicle,and the optimal energy consumption strategy of controllable load in multi energy microgrid.The main research contents are as follows:（1）Research on energy storage characteristic model of multi energy microgrid.Firstly,this chapter analyzes the working principle and operation characteristics of each energy storage unit,and establishes the multi energy microgrid energy storage unit model,power grid energy storage model,heating network energy storage model and gas network energy storage model.Then the controllable load is divided into transferable load,interruptible load and electric vehicle.It is regarded as a virtual energy storage unit in multi energy microgrid,its operation characteristics are analyzed and the corresponding mathematical model is established.The analysis of each unit model is conducive to optimize the structure of multi energy system and provide theoretical support for subsequent research.（2）Research on optimal energy consumption strategy of controllable load control based on excitation.This chapter first analyzes the impact of price incentive on users’ energy consumption time in microgrid,and establishes controllable load price incentive model and electric vehicle price incentive model.Then,under the premise of price incentive,the change of energy consumption mode of controllable load is analyzed,the optimization strategy of controllable load energy consumption is established,and the simulation operation scenario is established to analyze and verify the optimization strategy of controllable load multi energy microgrid based on incentive.（3）Energy storage characteristics model of multi energy microgrid considering controllable load uncertainty.In multi energy microgrid energy storage,controllable load can be used as an energy storage module.At the same time,the impact of controllable load uncertainty on system energy storage operation should also be considered.This chapter first considers the uncertainty of controllable load,and establishes the uncertainty model of controllable load and the uncertainty model of electric vehicle output.Secondly,considering the constraints such as controllable load output and efficiency,electric vehicle output and charging and discharging power of energy storage system,three scenarios are constructed and solved by improving particle swarm optimization algorithm.Through simulation analysis,it is verified whether the optimization of energy storage characteristics of multi energy microgrid considering controllable load uncertainty can improve the maximum energy storage capacity,energy storage charging and discharging rate and the smoothness of energy storage fluctuation curve,so as to realize the optimization of energy storage characteristics of multi energy microgrid.