YONEMORI Hideto | ![]() |
Center for Supports to Research and Education Activities | |
Assistant Professor | |
Engineering / Other Field |
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– In recent years, the power conversion capability of grid-connected power supplies using the photovoltaic generation system have been introduced rapidly. The power conditioning system (PCS) of PV generation system operates the reactive and active power flow control in accordance with the line voltage regulation level. The reactive power flow control by using the PCS and/or SVC can effectively decrease the line voltage level, however, the voltage imbalance of high voltage distributed line become the cause that results simultaneously.
This paper describes the novel power flow controller which is installed near by the pole transformer, to maintain the voltage level the grid-connected distribution line and the voltage imbalance compensation at the high voltage distribution line. Simulation results using the Matlab/Simulink are demonstrating the effectiveness of the proposed power flow converter system.
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The phase-shift controlled series resonant high frequency inverter has attracted growing interest as an induction heating and plasma production for basic research and industrial application. In general, the phase-shift controlled series resonant inverter by using the resonant current tracking or adaptive control scheme have excellent characteristics for power regulation and sof
The Japan Institute of Power Electronics, Mar. 2015, パワーエレクトロニクス学会論文誌, 40, 182 - 187, Japanese[Refereed]
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Proposed is a new type of magnetoplasma thruster using one radio frequency system for both plasma production and ion heating. This is accomplished with a rotating field antenna consisting of a pair of antenna windings, which are fed by two radio frequency outputs with relative phase difference of -n to n. If the rotating field antenna excites, by a proper phasing, the fields polarized in left-hand sense with respect to the external magnetic field, the fields couple to slow ion cyclotron waves that accelerate ions at the ion cyclotron resonance. On the other hand, the right-hand polarized fields produced by opposite phasing do not couple with the slow waves and their energy goes to electrons via fast wave excitation and enhances ionization. It is experimentally verified that for hydrogen plasmas the density of produced plasmas and the temperature of heated ions change sinusoidally with the phase difference peaking at pi/2 and -pi/2, respectively, showing the ability to control power ratio of the ion heating to the plasma production by only changing the phase difference. At optimum condition, the exhaust velocity of ions corresponds to the specific impulse of 6000s. It is thus demonstrated that the use of the rotating radio frequency system provides novel controllability for the magnetoplasma thruster.
AMER INST AERONAUT ASTRONAUT, Mar. 2012, JOURNAL OF PROPULSION AND POWER, 28 (2), 364 - 370, English[Refereed]
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This paper presents the effects of introduction of residential polymer electrolyte fuel cell (PEFC) co-generation system with batteries in comparison with conventional systems that consist of a gas boiler and electric power from commercial grid, by computer simulation. The PEFC co-generation system in commercial use provides the average primary energy saving rate of 12.7% and CO2 reduction rate of 15.4% with respect to the conventional system. Addition of 8.0-kWh batteries to the PEFC system results in limited improvements of 0.8 points and 0.9 points in the reduction rates, respectively, yielding 13.5% and 16.3%, when using a conventional operation planning method. A new operation planning method is proposed in order to make a precise control of charging and discharging the batteries. The average primary energy saving rate reaches up to 16.9% by the improvement of 4.2 points, and CO2 reduction rate reaches up to 20.4% by the improvement of 5.0 points in the PEFC co-generation system with 8.0-kWh batteries using the new operation planning method. The new method can thus realize a substantial improvement in reduction rates. Furthermore, it is shown that the suitable battery module capacity for the residential PEFC co-generation system is 4.0 kWh. © 2011 The Institute of Electrical Engineers of Japan.
2011, IEEJ Transactions on Power and Energy, 131 (1), 108 - 117, Japanese[Refereed]
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This paper deals with the novel soft-switching inverter topology and its capability of high frequency switching technology to be applicable to the power conversion system. To realize the switching power supply in the MHz switching application, there are some problems to be solved. In order to overcome these problems, we propose the phase-shift controlled zero current switching (ZCS) inverter and its control scheme. This circuit has soft-switching capability in the MHz switching range by the ZCS circuit topology and can control the output power by the phase-shift controlled method. In addition, effectiveness of this circuit is confirmed by comparative experimental study between the conventional hard-switching circuit and proposed circuit.
The Japan Institute of Power Electronics, Mar. 2010, パワーエレクトロニクス学会誌, Vol.36,pp.89-94, 89 - 95, Japanese[Refereed]
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This paper deals with the novel soft-switching inverter topology and its capability of high frequency switching to be adopted to the power conversion system. There are some problems to be solved, to realize the switching power supply in the MHz switching application. Especially, switching loss and EMI noise increase by the MHz switching operation is significant. In order to overcome these problems, we propose the phase-shift controlled ZCS (zero current switching) inverter in this paper. This circuit has soft-switching capability in the MHz switching range by the ZCS circuit topology and can control the output power by the phase-shift controlled method. In addition, effectiveness of this circuit is confirmed by simulation and experimental result.
MESAGO PCIM GMBH, 2010, INTERNATIONAL EXHIBITION AND CONFERENCE FOR POWER ELECTRONICS, INTELLIGENT MOTION AND POWER QUALITY 2010 (PCIM EUROPE 2010), VOLS 1 AND 2, 24 (C2-5), 366 - 371, English[Refereed]
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This paper deals with the introduction effects on the basis of the comparative study of residential PEFC (polymer electrolyte fuel cell) co-generation systems and conventional systems that consist of a conventional gas boiler or a condensing gas boiler or a CO2 heat pump and the thermal power plant, by using the computer simulation. The target systems for estimation conform to real systems in the market and the energy demand data acquired from the past field tests was applied. As a result, it becomes clear that the residential PEFC co-generation systems have high performance in the energy saving and the CO2 reduction, from a comparison study with conventional systems and CO2 heat pump system. Concretely to say, the average energy saving rate that the residential PEFC co-generation system provides is 13.9% and the average CO2 reduction rate is 16.5% using quantity of reduction of CO2 as estimate function. Otherwise, the average energy saving rate that the CO2 heat pump system provides is 13.7% and the average CO2 reduction rate is 10.0%. Furthermore we have proved the effectiveness a radiator in the residential PEFC co-generation system. © 2010 The Institute of Electrical Engineers of Japan.
2010, IEEJ Transactions on Power and Energy, 130 (7), 640 - 650, English[Refereed]
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This paper deals with the experimental result that is obtained from the GAMMA 10 and Kobe Cusp direct energy conversion (DEC) experiment system in the Tsukuba-Kobe university internet connected remote participation system. A DSO (Digital Sampling Oscilloscope), a PCMCIA based AID converter and a PC (Personal Computer) server as the controller and the data storage server are used as a simulation experiment Of Data Acquisition(DAQ) system. The communication between the Kobe University and the University of Tsukuba did the information transmission between the monitor site of Kobe and the experimental system operator site of Tsukuba, by using the communication of the browser base. The experimental result in the latest shot can be reflected to the parameter change for next shot. The parameter setting and control of DSO etc. becomes possible, without controlling through the operator of the University of Tsukuba by using the common gateway interface (CGI) based program.
AMER NUCLEAR SOCIETY, Feb. 2007, FUSION SCIENCE AND TECHNOLOGY, 51 (2T), 394 - 396, English[Refereed]
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The soft-switching high-frequency AC link converters are more suitable for cogeneration systems using new energies such as solar batteries because of the downsized transformer, lowered switching losses, reduced EMI noise and so on. However, most of the soft-switching quasi-resonant PWM converters cause an increase of conduction losses due to a circulating current generation. Furthermore their resonant circuits are influenced by the load current. This paper presents a novel high-frequency AC link three-phase cycloinverter which can solve these problems. Its operation principle is illustrated and evaluated by means of simulated results.
The Japan Institute of Power Electronics, 1996, Journal of the Japan Institute of Power Electronics, 22 (1), 42 - 48In this paper, a novel prototype of three-phase AC-DC active power converter operating at zero voltage soft switching sinusoidal PWM scheme is presented which incorporates a new transformer-assisted resonant rank DC link (TQRDCL) topology. The operating principle of TQRDCL circuit Is described including unique features and its design procedure is discussed in terms of the theoretical analysis. The three phase soft-switched active converter with supply voltage senssorless estimation strategy is proposed from a theoretical point of view. The simulated operation characteristics of this converter system which incorporate the new prototype of TQRDCL curcuit and advanced control implementation is demonstrated as compared with hard-switching-based PWM converter systems.
I E E E, 1996, INTELEC - EIGHTEENTH INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE, 562 - 569, English[Refereed]
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本論文は,フルブリッジ内の全パワーデバイスがターンオン,ターンオフ両時点においてソフトスイッチング動作ができる定周波位相シフトPWM制御方式高周波直列共振インバータと,そのソフトスイッチング動作が可能となる回路パラメータ限界について図説評価したものである.
The Institute of Electronics, Information and Communication Engineers, 1994, The Transactions of the Institute of Electronics,Information and Communication Engineers. C-(0xF9C2), J77-C2 (8), 351 - 354, Japanese[Refereed]
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本論文は、新方式トランス共振DGIリク(TQRDCL)を用いたゼロ電圧ソフトスイッチングPWN(ZVS-PWM)三相電圧形アクティブ整流コンバータの主回路と制御方式を提示し、動作原理、特徴を述べ、定常特性について評価、検討したものである。
The Institute of Electronics, Information and Communication Engineers, 18 Sep. 1996, Proceedings of the Society Conference of IEICE, 1996 (2), 405 - 405, JapaneseThe newly-proposed Resonant DC Link (RDCL) topology operating under the high-frequency trans-former-assisted zero-voltage soft switching commutation principle is presented in this paper. This basic circuit operating principle and the optimum design procedure for Transformer-Assisted Quasi-Resonant DC Link (TQRDCL) which excludes its load current sensing-based predictive feedback control loop and the DC voltage-clamped PWM function are considered as compared with the conventional RDCL circuit topologies. The performance of three-phase ZVS-PWM inverter system is discussed and evaluated in terms of the comparative study between TQRDCL three-phase soft-switching PWM type and conven-tional three-phase hard-switching PWM inverter systems on the basis of the simulating and experimental results.
Yamaguchi University, Mar. 1995, Memoirs of the Faculty of Engineering,Yamaguchi University, 45 (2), p321 - 329, JapaneseTo minimize switching losses/stresses and EMI noise,the new DC link topology with Auxiliary Transformer-assisted Quasi-Resonant DC Link (TQRDCL),which excludes load current predictive control is proposed. Its operating characteristics and design prosedure of new TQRDCL are described in this paper. Newly-proposed CVCF inverter system with TQRDCL,which is controlled DSP system is discussed and evaluated in terms of using the computer-aided simulating results. In addition to this,in order to comfirm the reduced switching losses/stresses and EMI noise level,TQRDCL-CVCF inverter is developed trially. This equipment suitable for CVCF/UPS system is tested and evaluated under linear and non-linear electrical loads from a practical point of view.
The Institute of Electronics, Information and Communication Engineers, 20 Jan. 1994, IEICE technical report. Power engineering in electronics and communications, 93 (413), 33 - 38, JapaneseTextbook
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