Research On Vibration Characteristics Of Magnetically Controlled Reactor

DC current is applied to the magnetically controlled reactor to change the magnetic saturation of the core during operation.The magnetic assistance of DC magnetic flux to AC magnetic flux changes the inductance of the reactor and provides continuous reactive power for the power system.The most promising magnetically controlled reactors are split-core type and magnetic valve type.The Maxwell electromagnetic force dominates the vibration of the split-core magnetically controlled reactor,while the magnetostrictive force dominates the vibration of the magnetic valve controllable reactor.Therefore,the vibration characteristics of split-core and magnetic valve controllable reactor need to be studied separately.The main works are as follows:(1)The magnetization and magnetostrictive properties of the silicon steel sheet are measured,as well as the Young’s modulus of the gap filler.First,the magnetic properties of the non-oriented silicon steel sheet 50WW470 under different DC bias are measured using a single silicon steel sheet magnetization and magnetostriction characteristics test system.Then,the Young’s modulus of the gap filler used in the split-core magnetically controlled reactor under different magnetic fields is measured.The measurement data provide basic data for subsequent simulation calculations.(2)The electromagnetic-mechanical coupling model of the iron core system in magnetically controlled reactor is established.According to the measured material properties and the related theories of electromagnetic field and mechanical field,the electromagnetic-mechanical coupling model of the iron core system of the magnetically controlled reactor is established using finite element method.(3)The vibration characteristics of split-core magnetically controlled reactor are studied through simulation and experiments.First,the thickness of the gap filler is calculated.Then considering the change of Young’s modulus of gap filler,the magnetic field distribution,stress distribution and vibration acceleration of split-core magnetically controlled reactor are simulated and experimentally studied.The results of vibration analysis provide references both in theoretical and experimental for further vibration reduction.(4)The vibration characteristics of multi-stages magnetic valve controllable reactor are calculated and analyzed.First,the structural parameters of each magnetic valve are calculated.Then,the magnetic field,stress and vibration displacement of magnetic valve controllable reactor under different DC bias are simulated and calculated.The structural parameters of the magnetic valve with the smallest vibration displacement are obtained through the analysis and comparison of the calculation results,which will provide a reference for the design and vibration reduction of low-vibration magnetic valve controllable reactor.