Vibration Analysis And Reduction Research Of Segmented Core Reactor

The iron core reactor is an essential electrical equipment in the power system,which is commonly used to limit the short circuit current,suppress harmonic and compensate reactive power of grid system.But the vibration noise of the iron core reactor caused by its special core structure is much heavier than that of the air core reactor with equivalent capacity.With the continuous improvement of people's awareness,the gradual rise of material life level and the progress of scientific level,the vibration and noise of reactor has become an important factor which limit the application of reactor and the demand of market in recent years.The research of vibration reduction has become an urgent problem in reactor manufacturing industry.Firstly,the magnetization and magnetostrictive properties of the non-oriented silicon sheet 50WW470 is measured under no external force and different pre-stressed forces.The magnetic properties data would be introduced into the material model library to lay the foundation for finite element simulation of the reactor.Secondly,a three dimensional magneto mechanical coupling numerical model of core reactor is established under the consideration of electromagnetic force and magnetostrictive force.The numerical analysis and calculation of the magnetic field and mechanical field of segmented core reactor are carried out.The influences of magnetostrictive effect and electromagnetic attractive force on the vibration of the reactor are discussed respectively through finite element simulation.In addition,the vibration characteristics of the core reactor under variable pressures are compared,which lay a foundation for the further study of vibration reduction.Finally,this paper focuses on solving the vibration noise and vibration-suppression problems caused by electromagnetic force and magnetostrictive force,and proposes a novel method of filling negative giant magnetostrictive material in the air-gaps to suppress reactor vibration.The basis is the inductance of reactor filling negative giant magnetostrictive material is consistent with common one.The force caused by negative giant magnetostrictive material will offset the original deformation to reduce vibration.The magnetostriction constant and size of negative giant magnetostrictive materials are determined by combining genetic algorithm with finite element iterative computation.The results show that the vibration displacement of the reactor is reduced obviously,which provides theoretical support for the design of lower noise reactor.