Abstract Mitigation and control of leakage fluxes and short circuit forces needs much more attention, for a high-temperature superconducting (HTS) transformer, than for a conventional one. Different methods such as the application of auxiliary windings, multi-segment winding, and flux diverter have been presented in the literatures for leakage magnetic field reduction in HTS transformers. In this paper, for the first time, optimal design of auxiliary windings has been performed for a 132/13.8 kV, 50 MVA three phase core type HTS transformer. Genetic algorithm (GA) has been used for the optimization process. Induced current in auxiliary windings which is inversely proportional to the leakage fluxes and short circuit forces has been considered as the objective function. An analytical method has been proposed in this paper which formulates the objective function in terms of the self and mutual inductances of the main and auxiliary windings. Consequently, the optimal parameters of the auxiliary windings have been determined. It is shown that utilizing the optimized auxiliary windings design, the leakage fluxes, the radial and the axial components of the short circuit forces are reduced significantly. Two-dimensional electromagnetic field simulations using finite element method (FEM) by application of COMSOL multiphysics software have verified the theoretical formulations.

中文翻译：

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通过辅助绕组优化设计降低 HTS 变压器漏磁通和短路力

摘要 与传统变压器相比，高温超导 (HTS) 变压器需要更多关注漏磁通和短路力的缓解和控制。在降低高温超导变压器漏磁场的文献中，已经提出了不同的方法，例如应用辅助绕组、多段绕组和磁通分流器。本文首次对132/13.8 kV、50 MVA 三相铁心高温超导变压器进行了辅助绕组优化设计。遗传算法（GA）已被用于优化过程。与漏磁通和短路力成反比的辅助绕组中的感应电流被视为目标函数。本文提出了一种分析方法，该方法根据主绕组和辅助绕组的自感和互感来制定目标函数。因此，已经确定了辅助绕组的最佳参数。结果表明，利用优化的辅助绕组设计，漏磁通、短路力的径向和轴向分量显着降低。应用 COMSOL multiphysics 软件使用有限元法 (FEM) 进行二维电磁场仿真，验证了理论公式。漏磁通、短路力的径向和轴向分量显着降低。应用 COMSOL multiphysics 软件使用有限元法 (FEM) 进行二维电磁场仿真，验证了理论公式。漏磁通、短路力的径向和轴向分量显着降低。应用 COMSOL multiphysics 软件使用有限元法 (FEM) 进行二维电磁场仿真，验证了理论公式。