Study On Flywheel Energy Storage Control System

Energy is the core factor of the modern industry, which influence thedevelopment of the society as a whole. The diversity, reliability and stability ofenergy demand is put forward higher requirements for energy storage device. As akind of new technology of storing the mechanism energy, flywheel energy storagehas fast response speed, high energy conversion rate, no pollutions, and long life etc.Currently, in the field of wind power, uninterruptible power supply (UPS), electricvehicles, and aerospace technology has been widely used, which have broadprospects for development and market competitiveness.Firstly, the principle, structure and working mode of the flywheel energy storagesystem (FESS) are analyzed in detail in this paper, according to the energytransformation to select the permanent magnet brushless DC motor as the flywheelmotor. Then, the thesis has designed the STMicroelectronics ST7FMC2S4T6singlechip microcomputer as the core of control system, and put forward the controlmethod of charging and discharging process, according to the working principleof flywheel energy storage system and used MATLAB simulation software to build asimulation model. Finally, the thesis has carried on the simulation experiment of thecontrol mode and designed FESS hardware and software based on the simulationdata. The charging part is to achieve the conversion of electrical energy to kineticenergy, which combined PAM modulation and PWM modulation method to realizebi-directional inverter, and had double closed loop control of the motor speed andcurrent during acceleration. The discharge part is completed converting the kineticenergy into the electrical energy. In the discharge process, PWM inverter circuit isstopped, the inertia of the flywheel to its own drive motor in the power generationstate, due to the output voltage decreases as the speed decreases to ensure the stableDC output voltage, this design used regenerative braking control strategy to controlthe output voltage and current. Finally, the stability220V AC is output through the SPWM modulation inverter circuit. This design is verified by experiment thefeasibility of the control method.