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RISS 인기검색어
- 검색키워드
- 저자 : Yushi Miura (검색결과 4 건)
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Daido, Tetsuji,Miura, Yushi,Ise, Toshifumi,Sato, Yuki The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5
An application of doubly-fed induction generator (DFIG), which is one of adjustable speed generators, to a gas engine cogeneration system has been investigated. To operate during a blackout as an emergency power supply is one of important roles for the gas engine cogeneration system. However, the DFIG requires initial excitation for startup during a blackout because the DFIG has no excitation source. In this paper, we propose the "blackout start" as a new excitation method to generate a rated voltage at the primary side during a blackout. In addition, a stand-alone operation following a blackout has been investigated by using experimental setup with a real gas engine. Power flows in the generating set with the DFIG at the stand-alone operation have been investigated experimentally. Experimental investigation of the power flow suggests that the generating set with DFIG has optimal speed in minimizing whole system losses.
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Tetsuji Daido,Yushi Miura,Toshifumi Ise,Yuki Sato 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5
An application of doubly-fed induction generator (DFIG), which is one of adjustable speed generators, to a gas engine cogeneration system has been investigated. To operate during a blackout as an emergency power supply is one of important roles for the gas engine cogeneration system. However, the DFIG requires initial excitation for startup during a blackout because the DFIG has no excitation source. In this paper, we propose the “blackout start” as a new excitation method to generate a rated voltage at the primary side during a blackout. In addition, a stand-alone operation following a blackout has been investigated by using experimental setup with a real gas engine. Power flows in the generating set with the DFIG at the stand-alone operation have been investigated experimentally. Experimental investigation of the power flow suggests that the generating set with DFIG has optimal speed in minimizing whole system losses.
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Rejeki Simanjorang,Yushi Miura,Toshifumi Ise 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
Connecting Distributed Generations (DGs) into distribution system has presented a challenge of controlling voltage profile in distribution system. In the presence of DGs, voltage profile of distribution system becomes non-uniform and may result in large voltage fluctuation at loads. Therefore, there is need for strict limitation on power injected by DGs. This paper proposes an effective method to overcome the problem of increase/decrease of voltages in distribution system due to the presence of DGs, and it also results in higher permissible power injected by DGs. The proposed method solves the problems by firstly, changing radial to loop distribution configuration. Then secondly, by using series type Back-To-Back (BTB) converter to control voltage profile of the resulting loop distribution system. Two control nodes in the loop distribution system are used to control the voltage profile. The series type BTB converter is installed at the sending end voltage node of loop feeder. The effectiveness of the proposed method is shown by the improvement of voltage profile and the small size of series type BTB converter. Theoretical analysis is discussed and simulation results are shown to verify the proposed method.
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Daisuke Terazono,Jia Liu,Yushi Miura,Toshifumi Ise 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The increasing penetration rate of inverterinterfaced distributed generators (DGs) will lead to the inertia decrease of the grid. To solve it, virtual synchronous generator (VSG) control, which enables inverter-interfaced DGs to have inertia like synchronous generators (SGs), has been proposed. However, VSG control requires extra energy storage to emulate kinetic energy fluctuation in rotating mass of SGs. In this study, kinetic energy of motors existing in the grid as loads is temporarily utilized to absorb disturbance in the grid so that the cost of energy storage is minimized. Furthermore, as a large portion of loads in the grid consists of motors, large inertia support can be expected. To achieve it, VSG control is applied to grid side converter of back-toback ac-dc-ac converter in a motor drive system, and coordinated control between VSG control and motor speed control is proposed. The effectiveness of suppression of grid frequency fluctuation by the proposed control system is shown through simulation results.
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