The vibration and noise of the saturable reactor used in A5000 converter valve are serious problems, and the main factor of the vibration is the magnetostrictive effect caused by AC harmonic currents. In order to study the vibration mechanism of the saturable reactor core, the magnetic field, circuit, and structure field are coupled based on finite element method (FEM) and the improved magnetostrictive model. The magnetic flux density, displacement, magnetostriction force, and Maxwell force of a single core are simulated when it is working < 200 Hz AC voltage of different amplitude. A single core of the saturable reactor vibration experiment platform is built to validate the simulation. The calculated vibration acceleration is consistent with the experimental data. The aim of the study is to predict the core's vibration level and build a basis for seeking new vibration reduction methods at the design stage of saturable reactor.

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Vibration of saturable reactor core used in HVDC converter valve system

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