中文摘要：

有铁心超导电机边界条件复杂、磁场计算易受铁心饱和影响,且电机等效参数与频率、阻尼屏蔽系统（DSS）的材料和结构有关,导致已有解析法在分析此类电机DSS性能方面受到限制.本文将励磁绕组等效为探测线圈,基于时谐场有限元法分析了交变磁场在励磁绕组中的感应电流的变化情况,并基于此计算了DSS的屏蔽系数;将时域法引入到超导电机直轴和交轴超瞬态参数的计算,分析了超导电机接入无穷大电网时电机的阻尼特性.以一台500kW有铁心超导电机为例,分析了影响DSS性能的因素,计算结果表明,电导率高、厚度大的DSS对交变磁场的屏蔽性能更好,但其阻尼性能却较差.因此,为了获得DSS的最佳的性能,对其屏蔽系数和阻尼性能的准确计算和综合考量是十分重要的.

英文摘要：

The iron-cored superconducting generator has a complicated magnetic field boundary, and the values of machine＇s equivalent parameters are relevant to the saturation degree of the iron core, the frequency and the structures of the damping and screening system （DSS）. Thus, the existing theory to analyze the performance of the DSS is no longer effective. In this paper, taken the field winding as a detective coil, the induced eddy current in it was calculated by the time harmonic FEM to reflect the shielding performance of the DSS. Meanwhile, a time domain method was adopted to calculate both the d-axis and q-axis sub-transient parameters of the generator, based on which, the damping ability of the DSS was evaluated in the infinite power grid system. Taken a 500 kW superconducting generator as an example, the influence factors on the performance of the DSS was analyzed. The results shows that, a thicker and more conductive DSS has a better shielding but poorer damping performance. To compromise both of the two abilities, the accurate calculations are important in the design of the DSS.