Energy Management Strategy Of Micro Wind-Compressed Air Energy Storage System

With the increasing depletion of conventional energy and the increasing environmental pollution,new energy technologies have become the new engine of global economic growth and energy sustainable development.However,renewable energy such as wind energy and other intermittent and volatile characteristics,to the development of energy storage has brought significant challenges and opportunities.Compressed air storage because of its long life,large capacity,low cost,environmental pollution and other advantages of concern,is very suitable for use in wind power systems.In this paper,a new type of wind compression air system is designed,and its electrical control system and energy management strategy are designed to improve its stability and comprehensive energy efficiency.Compared with the traditional wind energy-compressed air energy storage coupled system structure,the design of electromechanical hybrid coupling in the feasibility and flexibility of a more good performance,improve the system response speed and overall operational efficiency.But also for the system control also put forward higher requirements,especially in the motor control face to face.Two permanent magnet synchronous motors in the system platform require four quadrants to meet the needs of the system operating in different operating modes.This paper completes the simulation analysis of vector control of permanent magnet synchronous motor based on id equals zero in MATLAB/Simulink environment and validates the control system of permanent magnet synchronous motor based on dSPACE of hardware ring equipment,which facilitates the optimization control of follow-up work mode TheIn this paper,the working mode and optimal control strategy of the system are analyzed under the premise of determining the topology of the micro-wind compressed air energy storage system.The main operating modes exist in the system:independent wind power mode,compression storage mode,expansion and release mode,unloading protection mode.For the different working modes,this paper puts forward the corresponding optimal control strategy:for the control of the wind turbine,the maximum power point tracking(MPPT)control strategy is adopted to ensure that the wind energy captured by the system is the maximum value under the current wind speed.(MEPT)control strategy is adopted to design the selection criteria of mechanical compression and voltage compression for different coupling methods to improve the overall operation efficiency of the system.For the system unloading protection control,the bus voltage and power double control strategy are adopted,Both can quickly achieve the unloading of excess wind energy,but also to avoid the frequent removal of the unloading device and cut out.In order to solve the energy management problem of the miniature wind compressed air energy storage system,the basic principles and implementation strategies of energy management are formulated to ensure the smooth operation of the system under variable conditions.In this paper,the mode switching strategy based on the speed pre-synchronization and the torque pre-synchronization is studied to reduce the torque impact caused by the switching mode of the system working mode.Through the whole system simulation results,the validity of theoretical analysis and management strategy is verified.Finally,a test platform of micro-wind compressed air energy storage system based on scroll machine is designed and designed,including hardware experiment platform and control system software design,and the experimental platform design experiment is used to verify the theory.The experimental results show that the maximum efficiency of compression storage mode and expansion and release mode is more than 40%in the whole test interval.The experimental system of this paper not only validates the validity of the proposed theory.