Analysis Of Electromagnetic Field Of Generator For Flywheel Energy Storage System And The Influence Of Flywheel On The System

Along with the rapid development and application of magnetic bearingtechnology and power electronics technology, flywheel energy storage systems(FESS)as a way which can achieve efficiently use of energy, energy storage, energyproduction and consumption increasingly play an important role in today’s societyand it is an important direction to solve the energy crisis. Flywheel energy storage towhich has many advantages, such as large capacity, long life, high power, highenergy storage density, pollution-free, widely applicable, simple to maintain,continuous working and no environmental requirements and so on. Flywheel energystorage systems become the most promising new storage energy technology. It can bewidely used in the aerospace, wind power stations, power system peaking,communication systems, uninterruptible power supply, low-Earth orbit satelliteenergy storage, power locomotives, solar power stations, torpedoes, racing, satelliteattitude control, etc. It has an important significance to the national economy andnational defense construction.As the core of the flywheel energy storage systems which is used to convertmechanical energy and energy, electric/generator should have both the characteristicsof high efficiency motors and generators, and its operating status absolutely impactthe efficiency of the whole system. This paper uses an2.2kW permanent magnetgenerator as the electric/generator of flywheel energy storage systems, the prototypefor the structure of the inner rotor permanent magnet affixed to the surface of themagnetic structures. Analysis of the flywheel energy storage system, based on systemmodeling and simulation, using the Simplorer structures flywheel energy storagesystem discharge circuit, the finite element method combined with Maxwell the motor solid model and co-simulation.In order to study the power supply characteristics of FESS with different typesof loads and its influence on the operation performance of generator, this papersimulate flywheel energy storage system discharge process with resistive, inductiveand capacitive loads, respectively. According to the change of air-gap magneticdensity in the generator during the discharge process, analysis the change pattern ofmotor electromagnetic field and the armature reaction properties and study the outputcharacteristics of the system. There is a certain reference value for the flywheelenergy storage system motor design optimization, and control system design.Flywheel is the energy storage component of the FESS, the whole systemcan be carried out transformation of energy is to rely on the rotation of the flywheel.The selection of flywheel material and design of the structure directly affect thedensity and energy conversion efficiency of the FESS. In order to analysis the effectsof the shape coefficient and material of flywheel on the system, this paper makessimulation on the discharge process with different flywheels in the FESS. Andanalyze the impact of different inertia flywheel on the electromagnetic field in thedischarge process. There is a certain reference value for the design of high energydensity, high efficient energy system.