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成为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的意义。目前还没有合适的设计方法。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，得出了一些明确的设计方法，并根据一定的标准完成了200mva、600mva和1000mva级发电机的设计。并从其在电力系统中的性能出发，对设计方法进行了评价，取得了满意的结果。另一方面，我研究了两种不同的励磁系统：外部励磁源法和带磁通泵的恒链磁通励磁法。前者是一种典型的或常规的励磁方法，通过电刷和集电极环给励磁电流，从而调节终端电压。后一种方法是利用磁通泵间接保持恒流，通过电枢反应自动调节励磁电流，可以确定具有较好的稳压效果。通过理论和实验研究，证明了所提出的一些设计方法是可行的，并且磁通泵无刷励磁系统优于传统励磁系统。该研究的结果已经在许多论文中发表，尚未整理的结果将在不久的将来报告。

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.