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Shoji Nishikata,Tatsunori Sato,Akira Ishizaki 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
A new and simple analytical approach for a self-controlled synchronous motor in which the magnetic saturation is taken into account is proposed. The operation limit for constant-power driving with field weakening is discussed, and it is shown that the speed control region becomes narrow if the magnetic saturation is considerable. The effects of short-circuit ratio are also examined, and it is shown that a wide speed range is obtained if short-circuit ratio is large. The effects of saturation on the allowable transient change in the field voltage are finally discussed.
Yamashita, Ken-Ichiro,Nishikata, Shoji Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.1
An electric power compensation system for a DC transmission system with an integrated wind turbine generator is proposed. The proposed compensation system consists of a synchronous generator and a duplex reactor. This apparatus is connected to the sending-end circuit of the DC transmission system. A set of steady-state equations of the system is first derived. Then, the effect of the duplex reactor, which can eliminate the sending-end grid current distortion due to commutation of the converter, is explored. The relationships among power at the sending-end circuit are also revealed. It is shown that fluctuations in the sending-end grid power due to changes in wind velocities are compensated with the proposed system. Finally, the effects of the sending-end grid conditions on the steady-state characteristics of the system are studied.
Studies on a Wind Turbine Generator System using a Shaft Generator System
Fujio Tatsuta,Toshiyuki Tsuji,Nobuharu Emi,Shoji Nishikata 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.2
In this paper a new de-link type wind turbine generator system using a shaft generator system, which is widely used for power sources in a ship, is proposed. The basic configuration of the proposed wind turbine generating system is first explained. And the equations expressing the system are derived. Then the steady-state characteristics of the generating system are discussed. We use an experimental system that can simulate the characteristics of a wind turbine in this study, because it is hard to operate an actual wind turbine in a laboratory. In addition, the transient responses of this system are investigated when the velocity of the wind is changed. It is shown that experimental results were very close to the simulated ones, supporting the usefulness of the theory.
Studies on a Wind Turbine Generator System using a Shaft Generator System
Tatsuta Fujio,Tsuji Toshiyuki,Emi Nobuharu,Nishikata Shoji The Korean Institute of Electrical Engineers 2006 Journal of Electrical Engineering & Technology Vol.1 No.2
In this paper a new dc-link type wind turbine generator system using a shaft generator system, which is widely used for power sources in a ship, is proposed. The basic configuration of the proposed wind turbine generating system is first explained. And the equations expressing the system are derived. Then the steady-state characteristics of the generating system are discussed. We use an experimental system that can simulate the characteristics of a wind turbine in this study, because it is hard to operate an actual wind turbine in a laboratory. In addition, the transient responses of this system are investigated when the velocity of the wind is changed. It is shown that experimental results were very close to the simulated ones, supporting the usefulness of the theory.