Control Strategy Of Flywheel Energy Storage Systems

With the rapid development of industrial technology,the world economy has developed by leaps and bounds,but it also can not help bring a variety of problems,such as energy shortages,environmental degradation and so on.With the continuous consumption of fossil energy,the development of new energy and clean energy is imminent.Flywheel energy storage as a mechanical energy storage,with a high power,high reliability,high energy density and environmental friendliness attracted more and more social attention.Development and utilization of its world scale are also growing on the flywheel energy storage system control technology,which has become more reliable.At present,the development of sophisticated flywheel energy storage system control technologies includes direct torque control,vector control technology.However,these control techniques meet the basic requirements,but inevitably there are various disadvantages.This paper introduces the research background flywheel energy storage technology development status and abroad,starting from the basic structure and mode of operation of the flywheel energy storage system,and introducing the basic unit of flywheel energy storage system,its core unit Flywheel motor selection and the establishment of a mathematical model.For the operating mode of the flywheel energy storage system the paper introduces a flywheel energy storage system based on PI dual closed-loop control and the boost chopper control strategy,by Matlab / Simulink simulation of its charge and discharge process simulation,the feasibility of the control strategy,and analyzed the shortcomings and deficiencies of the control strategy of the present.In response these shortcomings,the fuzzy control and comprehensive optimization PI-weakening control of flywheel energy storage control policy is produced,its controller is designed and verified by Matlab / Simulink.The flywheel energy storage system to meet the requirements under the basic mode of operation,but also good to make up for the proposed PI-based dual closed-loop control and the step-up chopper lack of strategy.Flywheel energy storage systems has the feature of non-linear loads and power systems has much non-linear loads,this paper choose LCL grid inverter as a flywheel energy storage systems and grid-connected inverter,and establish its mathematical model,analyze itsresonance problem and damping control methods.Analyzed of the advantages and disadvantages of the conventional repetitive control and proportional LCL network and the resonant inverter control,combining the advantages of both control strategies,proposed a repetitive control based on the ratio of the resonant network and improvements control strategy,simulation and analysis of the feasibility of the control strategy by Matlab /Simulink.It not only can better suppress high-frequency harmonics,but also has good dynamic and steady-state performance and anti-jamming capability.