Fundamental Researches on Design Method of Fully-Superconducting Generator, its Performances in Power Systems and its Excitation System

由于全超导发电机将是最先进的发电机组之一，因此对其性能和设计方法的研究具有重要意义。到目前为止，还没有开发出合适的设计方法。在本课题中，我对这种全超导发电机的设计方法进行了研究，得到了一些确定的设计方法，并结合一些规范，完成了200、600和1000 MVA级电机的设计。此外，从电力系统的性能出发，对设计方法进行了评价，得到了满意的结果。另一方面，研究了两种不同的励磁系统：外励磁源法和带磁通泵的恒磁链励磁法。前者是一种典型的或常规的励磁方法，通过电刷和集电环提供励磁电流，以调节端电压。后一种方法是利用磁通泵间接保持恒定电流，通过电枢反应自动调节励磁电流，并可以确定采取良好的调压。本文从理论和实验两方面进行了研究，证明了所提出的一些设计方法是可行的，并证明了磁通泵无刷励磁系统优于传统的励磁系统，研究结果已发表在许多论文中，尚未整理的结果将在不久的将来被报道。

As fully superconducting generator would be one of the most advanced acgenerators for power generation plants, the study about its performances and design method have the meaningful items. Appropriate design methods have been not yet developed so far. In this project, I have researched some design methods on such a fully superconducting generator and attained a few definite design methods, and accomplished 200, 600 and 1, 000 MVA class machines design, taking account of some criterions. Furthermore, from points of their performances in a power system I have evaluated the design methods, succeeding in the satisfactory results.On the other hand, I have investigated two different kinds of excitation systems as the follows : an external excitation source method and a constant linkage flux excitation method with magnetic fluxpump. The former is a typical or conventional excitation method to feed excitation current through brushes and collector rings so as to adjust the terminal voltage. The latter method is using the magnetic fluxpump to indirectly keep a persistent current with automatically adjusting the excitation current by armature reaction, and could be confirmed to take a good voltage regulation. These researches were done theoretically and experimentally and proved that some proposed design methods would be of use and the brushless excitation system with magnetic fluxpump would be better than the conventional excitation system.Results from the research have been already published in many papers and unarranged results yet will be reported in the near future.