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A Hybrid Energy Storage System Using a Superconducting Magnet and a Secondary Battery
Toshifumi ISE,Takeshi YOSHIDA,Sadatoshi KUMAGAI 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
Energy storage devices with high energy density as well as high power density are expected to be developed from the point of view of compensation of fluctuating load and generated power by distributed generations such as wind turbines, photovoltaic cells and so on. SMES (Superconducting Magnetic Energy Storage) has higher power density than other energy storage methods, and secondary batteries have higher energy density than SMES. The hybrid energy storage device using SMES and secondary batteries is proposed as the energy storage method with higher power and energy density, the sharing method of power reference value for each storage device, simulation and experimental results are presented.<br/>
POWER SYSTEMSTABILIZING CONTROL BY A HIGH SPEED PHASE SHIFTER WITH AN ENERGY STORAGE COMPONENT
Toshifumi Ise,Takanori Hayashi,Yoshishige Murakami 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
A High Speed Phase Shifter (HSPS) using PWM inverters is paid much attention in FACTS (Flexible ac Transmission System). The HSPS presented here is composed of three sets of a single phase PWM inverter, transformers and ac filters for suppressing switching ripples of inverters. The proposed system has an energy storage component, therefore the system can control voltage phase freely. Design of the HSPS and experimental results of power system stabilizing control on a 10kVA model power transmission are presented.
LOW TEMPERATURE CHARACTERISTICS OF POWER SEMICONDUCTOR DEVICES
Yoshishige Murakami,Toshifumi Ise,Atsushi Ishigami 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
Characteristics of various power semiconductor devices, such as MOSFETs, IGBTs, SCRs and power diodes are discussed in this paper based on experimental and 2-dimen-sional device simulation results for temperature higher than liquid nitrogen(77K).
A Series Voltage Sag Compensation Scheme with Open-Circuit Protection
Sumate Naetiladdanon,Toshifumi Ise,Hideki Fujita 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
In this paper, a series voltage sag compensation scheme with open-circuit protection is presented. The voltage sags and momentary interruptions during the fault occurred can be mitigated. For open-circuit protection, the faulted incoming line is disconnected and the new current path is made. The control scheme is proposed for voltage sag compensation and interruption compensation. Simulations of voltage sag compensation with open-circuit protection demonstrated the validation of the proposed circuit and control sequence of switches.
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.
Tetsuya Kojima,Toshihiko Takauchi,Toshifumi Ise,Isao Iyoda,Hiroyuki Sasao,Yoshiyuki Kono,Koji Temma,Nobuyoshi Inoue,Akira Kawamoto 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
A new parallel type voltage sag compensator is proposed. The proposed system can reduce the necessary capacity of a storage capacitor for voltage sag compensation by boost type power factor correction rectifier getting charging energy from residual voltage of utilities as it compensates the load voltage. This paper shows principle and control system of the proposed circuit. Compensation<br/> performances are demonstrated by experiments.
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.
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.
Configurations of AC and DC-type Quality Control Center for a New Distribution System FRIENDS
Yusuke Hayashi,Masaki Saisyo,Toshifumi Ise,Kuchiro Tsuji 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
Unbundled power quality service is paid much attention under the circumstances of deregulation and diversification of needs of customers for quality and price of electric power Moreover, distributed generators (DGs) such as photovoltaic generations and wind turbines will be introduced to distribution system more and more, and reverse flow of active power has possibility to cause new problems in the distribution system such as voltage rise of distribution line and protection problem<br/> Flexible, Reliable and Intelligent Electrical eNergy Delivery System, which is called FRIENDS, has been proposed as one of promising distribution system for such requirements, and intensive studies are under way One of features of the system is introducing Quality Control Center (QCC) into the system for unbundled power quality service and easy installation of DGs Two types of QCCs for such purposes are proposed, and simulation results are shown in this paper.<br/>
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.