Fig. 12 Output Terminal Voltage Waveforms when Capacitors are Connected.
In this paper, novel and simple circuit configurations have been proposed to realize a shaft generator system without output voltage distortion, and steady-state characteristics of the system have been investigated.
The following have been concluded from the discussion:
(1) A satisfactory harmonics elimination in output voltage waveform is achieved by canceling out the subtransient inductance of the synchronous compensator with duplex reactor.
(2) A set of steady-state equations for the proposed system has been derived, and the idea of designing the duplex reactor has been clarified.
(3) The steady-state characteristics have been discussed, and it has been clarified that THD of output voltage can be adjusted with the inductances of the duplex reactor, and that the dc link voltage and the synchronous compensator terminal voltage increase with an increase in the output power when the output terminal voltage is kept constant.
(4) To suppress the voltage increases of the system a simple method using capacitors has been proposed. It has been clarified that the increase in the voltages is suppressed greatly with this method.
The transient performances of the proposed shaft generator system will be reported at the earliest opportunity.
We express our sincere thanks to personnel from Gifu Works, Taiyo Denki Co., Ltd. for cooperating in this study. Also, some of these studies have been done with the help of Grant-in-Aid for Scientific Research of the Ministry of Education, Science, Sports and Culture, Japan, and the Research Institute for Technology of Tokyo Denki University.
[l] H. Gundlach "Statrc frequency converters for shaft generator systems," The Institute of Marine Engineers, London, UK, January 1972
 J. Nishiyama. H. Kotera. T. Kishimoto. M. Yamaji and M. Tsuji, "Shaft driven AC generator for fixed pitch propeller," Journal of the M. E. S. J., Vol. 13, no. 6, pp. 442-449, June 1978
 S. Nishikata, A. Odaka, Y. Koishikawa, and T. Kataoka
"Performance analysis of shaft generator systems,"
Trans. IEE of Japan, Vol. 118-D, No. 10, pp. 1209-1216. October 1998