Research On Electromagnetic And Noise Characteristics Of Iron-Core Reactor Model Under Interharmonic Excitation

With China’s clear goal of peak carbon dioxide emissions and carbon neutr ality,wind power,photovoltaic and other clean energy-related technologies have developed rapidly.What follows is the large-scale application of nonlinear devices such as power electronics,and the application of nonlinear devices such as power electroni cs will bring serious interharmonic pollution to the power grid.At the same time,the application of iron-core reactor equipment is increasing,and the noise problem caused by it is becoming more and more serious,and the presence of interharmonics in the excitation will aggravate the noise impact of the iron-core reactor.Therefore,it is of great scientific significance and engineering value to study the electromagnetic and noise characteristics of iron-core reactors under interharmonic excitation.Based on the experimental platform that can generate arbitrary interharmonic excitation,the electromagnetic and noise characteristics experiments of the iron-core reactor model are carried out,and the finite element model and neural network model are established to study its electromagnetic and noise characteristics.The main research contents of this paper are as follows:(1)An experimental platform that can generate any interharmonic excitation is constructed,and the A-weighted noise level is measured by using a sound level meter to measure the noise around the iron-core reactor model.The electromagnetic and noise characteristics of the iron-core reactor model under different interharmonic contents and frequencies are also analyzed.(2)Based on the magnetization curve and magnetostriction curve of the silicon steel sheet,the calculation model of the iron core reactor was constructed according to the finite element theory,and the validity of the finite element calculation model was verified by comparing with the experimental results.The magnetic field,force field and sound field characteristics of the iron-core reactor under different excitations are analyzed.(3)Based on the neural network theory,the calculation model of the iron-core reactor is constructed,and the magnetic field and noise of the iron-core reactor are predicted.The prediction results of the neural network model are compared with the calculation results of the finite element model,which verifies the validity of the neural network model.