| Due to the depletion of fossil energy and the increasingly serious environmental pollution problems,clean and environmentally friendly renewable energy has attracted more and more attention.As an inexhaustible renewable energy source,wind energy has been widely studied and applied.However,there is a problem of unstable production capacity of wind power resources,which makes large power fluctuations in wind power generation systems.As we all know,energy storage is an effective means to solve the volatility and intermittent nature of wind energy.Compared with storage methods such as batteries,super capacitors,pumped storage,and flywheels,compressed air energy storage methods have lower costs,longer life,and less pollution.And the advantages of high energy conversion efficiency.This paper takes the new miniature compressed air energy storage system proposed by Shandong University as the research object,and analyzes and studies the dynamic coordination and optimization control problems brought about by mode switching in the system operation.Compared to the traditional wind compressed air energy storage structure,the new system proposed in this paper uses a hybrid compression energy storage method in which mechanical compression and electrical compression are switched to each other.The mechanical compression energy storage method can reduce the number of energy conversions in the system,thereby effectively reducing the energy loss in the system,and has a significant effect on improving the overall operating efficiency of the system.This paper first analyzes the two control methods of compressed energy storage in the system,introduces the mechanical structure of the system,sets up a simulation model,and designs hardware and software equipment such as system controller,inverter and CAN control.Aiming at the problems existed in the pre-synchronization control of the mechanical compression of the system,the torque variation characteristics under different operating conditions of the mechanical compression control were obtained,which laid a practical foundation for the follow-up study.Based on the analysis of the motor control requirements of the system,its operating and control requirements were analyzed.The speed prediction control of the permanent magnet synchronous motor in the system was designed,and the advantages of the predictive control in the permanent magnet synchronous motor control in the system were analyzed.In the dynamic coordination control part of the mechanical compression of the micro compressed air energy storage system,the switching characteristics of the pre-synchronous control of the energy storage motor in the mechanical compression process are first analyzed through simulation,and the torque changes in the switching process and the switching process are simulated and analyzed.Then optimize the control simulation for the mechanical compression switching process of the system to reduce the mechanical shock when the system mode is switched,so that the switching torque can be smoothly transitioned.Finally,a mechanical compression switching test platform for micro-compressed air energy storage system was built.The effectiveness of the method presented in this paper was verified through experimental studies,which laid the foundation for optimal operation control and further practical application of the micro-compressed air energy storage system. |
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