Research On Power Supply Control Of Solar Flywheel Energy Storage System

In recent years,with the rapid development of the global economy,science and technology also make rapid progress.The improvement of the human living standards accompany with the growing demand for energy.However,there are many problems faced with energy,such as the scarcity of modern energy and irreversible environmental pollution caused by the fossil fuels,etc.So it is vital for us human beings to choose a clean,pollution-free energy.Now Solar electrical energy generation technology is the focal point for clean energy,because Solar energy is an infinite energy resource.And Solar energy has advantages such as simple structure,pollution-free,unlimited long service life,etc.With this research project,we need to focus on the storage of solar energy.Flywheel energy storage is a new type of mechanical energy storage method,which through the high-speed rotating blade drive motor transform the input electrical power into mechanical energy stored in the flywheel blades.When the system need electric power,high-speed rotation of the flywheel drags the motor to supply power,it converts the mechanical energy which stored in the flywheel leaves into electrical energy supply to the electric load.Flywheel energy storage system has a highly conversion kind of efficiency and long service life without pollution.So the system has high bright development prospect and great research value.The drive of the current existing flywheel energy storage system mainly choose AC synchronous motor which has a comparatively complex system and with higher production costs.However,AC induction motor has many advantages like cost-effectiveness,easy maintenance,etc.If AC induction motor is used in the independent power supply of solar flywheel energy storage system,it can reduce energy consumption and improve energy efficiency without excitation in the energy storge stage.Therefore,for the independent power supply of solar energy systems,we studied the use of a single three-phase asynchronous motor dragged solar flywheel energy storage.Firstly,Aiming at the problem of coordination among AC motor frequency conversion control,MPPT and motor control under the limited power input in this system,a power tracking slip frequency control method is proposed based on the slip frequency method.Using the results according to the MPPT algorithm as a power givenvalue,combined with the slip frequency method to control the power of the motor,the power of tracking is worked out,the establishment of the entire system control framework is constructed,also modeled and simulated in Matlab/Simulink software environment.on the basis of above situation.The control system uses the power tracking slip frequency control method and uses the MPPT calculation as a power given value for the power tracking slip frequency control,combined with the output voltage of the solar cell as the reference control SPWM output and implemented the problem of coordition among MPPT,solar energy output voltage regulator,limited power input under the AC motor frequency control in the same controller.Subsequently,the power supply process of the flywheel energy storage system is analyzed.The power generation process is discussed and the self-excitation is carried out by using the capacitive load.For asynchronous generator,the stator magnetic field by the DC voltage through the SVPWM pulse width modulation,frequency adjustment by three-phase voltage is given,which can realize the AC side(asynchronous motor front)voltage and current frequency adjustment based on direct torque control.Through the detection of the running speed of the system,the rotation speed of the stator flux of the asynchronous generator is controlled,so as to control the torque of the motor and realize the operation of the generator.Through the use of Matlab/Simulink simulation,we build the flywheel energy storage power supply control system,and the SVPWM wave generation device model as required.The overall model is built and simulated.The simulation results are used to verify whether the control of the power supply process of the flywheel energy storage system is appropriate.The results show that the system has many advantages,such as high response speed,good control performance,stability in power generation which is suit for practical use.