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Research On Dynamic Modeling And Simulation And Control Strategy For Non Complementary Combustion Compressed Air Energy Storage System

Posted on:2017-10-28Degree:MasterType:Thesis
Country:ChinaCandidate:Z J ZhaoFull Text:PDF
GTID:2322330503481184Subject:Control theory and control engineering
Abstract/Summary:PDF Full Text Request
The ecnomic and environmental problems have becoming seriously with more and more burnig of fossil fuels. Because of the volatility of new energy such as the wind and solar energy,the effective method to solve the problem is to develop the large scale energy storage technology. Compressed air energy storage is not limited by geographical restrictions, high energy storage efficiency and high economic performance, it is expected to become one of the most promising energy storage methods.In this paper, the principle of compressed air energy storage system is introduced in detail. The integrated model of the scroll compressor, gravel packed bed, gas storage room, scroll expander, super capacitor unit and PWM with the permanent magnet generator are established. The partial differential equations in packed bed of one dimensional unsteady heat conduction diffusion of two phase model is solved by Matlab numerical calculation method. The mathematical model of the packed bed is obtained by using FLUENT ANSYS simulation software to simulate the thermal storage and thermal storage of packed bed. The geometric model of scroll compressor and the dynamic equation of gas mass in chamber are established, the athletic equations of the main shaft and the dynamic equation of gas pressure in the chamber is given. The volume of gas in the chamber is consided as the control variables, the gas temperature is obtained combining with the energy conservation equation. The state equation of pressure, temperature, mass, and transient volume of gas in the chamber for the scroll expander and the integrated model of PWM and permanent magnet generator are obtained according to the energy conservation equation and mass conservation equation. Secondly, the theory of single input single output and multiple input multiple output exact linearization are introduced,a precise feedback linearization controller is designed with the gas storage room.The temperature and pressure of the gas in the gas storage chamber can be quickly returned to the equilibrium point by changing intake valve and outlet valve with a step signal applied at the input.Next Matlab and Fluent interfaces are implemented based on C language interface functions and UDF expansion. The model of gas storage chamber and controller are set up respectively in the Gambit and Matlab. The cooperative simulation between the two software is realized. At last we make a research on the optimal tracking control of the compressed air energy storage with the super capacitor hybrid power generation system. The optimal control rate of state feedback exact linearization is designed for the super capacitor based on the optimal tracking control theory for using exact feedback linearization method. It is used to smooth the power of the power grid load caused by the start-up, stop and sudden load. The optimal control rate is also designed for the PWM and the permanent magnet generator to track the load curve for 24 hours somewhere by using the optimal control theory. Simulation results show that the theory and method of optimal tracking control based on exact feedback linearization can give full play to the advantages of the system.The fast optimal tracking of power network load are realized. At the end, the future research work and the application of compressed air energy storage system in the new energy field are prospected.
Keywords/Search Tags:compressed air energy storage, cold storage and thermal storage, exact feedback linearization, optimal tracking, co-simulation
PDF Full Text Request
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