| As a very good frequency modulation resource,the electric energy storage system was introduced into the thermal power unit,so that the AGC frequency modulation performance of the unit reached the regulation expectation of the power grid.However,with the development of electric energy storage technology,the capacity of the energy storage battery pack continues to increase and the battery pack is dense layout and the accumulation of heat during the charging and discharging process caused the temperature in the battery container to rise significantly.To ensure that the battery works within a suitable temperature range,it is necessary to analyze the temperature environment in which the battery is located,and take temperature control measures in time for temperature changes to achieve the purpose of real-time temperature control.In this thesis,based on the temperature model of energy storage battery container,a fuzzy PID controller and a temperature and humidity decoupling control system with static compensation are designed.The main content of this thesis is as follows:Firstly,this thesis introduces the current application status of energy storage systems in the power industry,the status of energy storage batteries,and the status of battery container temperature control.The electrical energy storage system of a thermal power unit is studied,including its composition,working principle,network communication and the reaction principle of the energy storage battery,also the battery management system.Then,the impact of battery heat dissipation and ambient temperature on the battery pack is analyzed.The research content lays the foundation.Secondly,this thesis illustrates the temperature and humidity characteristics of the energy storage battery container under various influencing factors.Based on the principle of energy balance and air mass balance in the container,a dynamic mechanism model of temperature and humidity of the energy storage battery container is established and analyzed.From the thermodynamic formulas I derive the temperature and humidity coupling relationship expression of energy storage battery container,fitting temperature and humidity compensation polynomials.Finally,those the temperature and humidity fuzzy PID controllers of energy storage battery container and two-input two-output temperature and humidity decoupling control system based on static compensation are designed.Using Simulink toolbox in MATLAB software to carry out simulation respectively,the comparison of the simulation control effect of three types of control: conventional PID,fuzzy PID and temperature and humidity decoupling control system based on static compensation.At the same time,step disturbance signal is added after the system reaches stability to verify the anti-interference ability of the system.Simulation experiments prove that the temperature and humidity decoupling control system based on static compensation designed in this thesis has better control effects in terms of adaptability,dynamic performance,steady-state performance,and anti-interference ability. |
PDF Full Text Request