| A steady flow of energy is required by the rapid development of society as a power support.The large consumption of fossil energy can meet the energy supply required by social development to a certain extent,the environmental pollution and resource waste caused by it has attracted more and more attention.The use of renewable energy has become an effective way to replace fossil energy pollution.With the large-scale application of renewable energy power generation,the voltage fluctuation,flicker and instability caused by it have caused great impact on the power grid,and its development is subject to certain restrictions.The emergence of energy storage technology can solve many problems of renewable energy power generation,and also has great application value for the grid "peak cutting and valley filling".Among many energy storage technologies,compressed air energy storage(CAES)has advantages that other energy storage methods do not have in terms of service life,energy storage capacity,cycle cost,etc.,and has become an energy storage method with great development potential in the future energy storage field.But,many problems,such as low efficiency and gas leakage,can still be found in traditional method.It has not completely got rid of its dependence on fossil energy,and further research is necessary.Firstly,through the analysis of traditional compressed air energy storage and advanced adiabatic compressed air energy storage,the structure of the energy storage system was improved to deal with the remaining inefficiencies and gas leaks,and the use of hydropower in the energy release link of the system was clever.The energy release method is used to generate electricity,and a compressed air hydrodynamic energy storage method is proposed.Mathematical modeling of the compressed air hydrodynamic energy storage system compressor,expander,gas storage device,heat storage device and water turbine,analysis of the system's single-stage workmanship and multi-stage workmanship,it is concluded that the system is adding heat storage.The heat exchangecomponents have improved the efficiency of the system,and on this basis,the system's cycle conditions are analyzed.Secondly,the optimization control strategy of system efficiency is proposed,and the maximum efficiency optimization control is carried out for the compression energy storage and expansion energy release of the system respectively.According to the practical application background of compressed air energy storage,an optimized control scheme for the expander speed of the energy release link of the compressed air hydrodynamic energy storage system is proposed.A fuzzy sliding mode control algorithm is designed.The algorithm is verified to meet the stability requirements.Finally,the speed verification of the expander speed control of the energy release link of the compressed air energy storage system was simulated and verified.The results show that constant pressure condition release and constant volume energy release,the expander speed can quickly reach and maintain near the optimal speed The efficiency of the expander is increased by about 1.2%,which verifies the rationality and feasibility of the optimized control,and provides a certain reference for the subsequent optimization of the compressed air energy storage efficiency.And with the help of the experimental platforms of some companies Tianmiao New Energy Technology in Beijing,an experimental analysis was conducted. |
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