Multicriteria Optimal Winding Scheme in HTS Transformers by Analytical Hierarchy Process

When designing high-temperature superconducting transformers, leakage magnetic field, ac loss, circulating current, and electromagnetic forces are important issues. These factors are accounted for by a proposed method providing initially different winding schemes, i.e., helical, cylindrical, and pancake. We pursue a versatile optimization scheme that is applicable to different winding types. The above requires advanced numerical techniques and hence simulation studies for calculating the leakage flux density and electromagnetic forces in each configuration scheme. Considering the optimization of all the aforementioned criteria (ac losses, circulating currents, and electromagnetic forces), an intelligent choice of optimal winding geometry is obtained using analytical hierarchy process optimization, which is the main motivation for this brief.