Calculation and validation of stray‐field loss in magnetic and non‐magnetic components under harmonic magnetizations based on TEAM Problem 21

On the basis of the TEAM problem 21 benchmark model, a modelling method to predict stray-field loss under real working conditions is presented and validated to investigate the influence of harmonic excitation on stray-field loss of shielding structural components of converter transformers in high-voltage direct current systematically. An improved method is adapted to determine stray-field loss of magnetic and non-magnetic component based on the experimental measurement and numerical simulation. An experimental platform is established to measure magnetic properties and loss characteristics of the grain-oriented silicon steel sheets, aiming at parameter identification and verification of the loss modelling applicable for laminated sheets under harmonic magnetisation. Meanwhile, the additional iron loss caused by perpendicular flux penetration is obtained by special treatment of material properties and analysed to observe its contribution to the stray-field loss under three-dimensional harmonic magnetisation. Field and loss comparison between measurement and simulation verifies the validation of the proposed modelling method.