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K.Izaki,I.hirota,H.Yamashita,H.Omon,K.Matsumoto,K.Nishida,J.M.Sun,M.Nakaoka 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This paper describes an advanced prototype of voltage-fed zero voltage soft-switching PWM resonant inverter with an active voltage clamped capacitor, which is put into practice for high-frequency high-power induction-heated appliances This application-specific quasi-resonant inverter using the latest generation IGBTs for soft-switching can regulate its output power under a principle of a fixed frequency ZVS-PWM strategy. Its operating principle and unique features are presented as compared with a conventional quasi-resonant ZVS inverter for induction-heated cooker, together with its power regulation characteristics on the basis of its simulation and experimental results. The steady-state performances of this inverter developed for mutli-bumer type induction-heated food cooking appliance are evaluated and discussed from a practical point of view.<br/>
SINGLE-PHASE CURRENT SOURCE INVERTER WITH PULSE AREA MODULATION SCHEME FOR SOLAR POWER CONDITIONER
K.Hirachi,K.Matsumoto,M.Ishitobi,M.Ishibashi,M.Nakaoka 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
In general, a singte-phase current-fed PWM inverter using IGBTs has some unique advantages for small scale distributed utility-interactive power supply system as compared with voltage-fed PWM inverter. In particular, this is more suitable and acceptable for a non-isolated type utility-interactive power conditioner, which is going to be widely used for residential solar photovoltaic (PV) power generation system in Japan However, this current-fed PWM inverter has a significant disadvantage. The output current of this inverter includes large harmonic contents when the inductance of smoothing reactor in its DC side is not large enough to eliminate its current ripple components of this inverter In order to overcome this problem, a new conceptual pulse area modulation scheme for this inverter is introduced in difference with conventional PWM strategy. This paper presents a new effective control implementation of this PV power conditioner which is able to reduce the harmonic component in the output current produced by the single-phase current-fed PWM inverter even when the npple current in the smoothing DC reactor is relatively large. The operating principle of the proposed control strategy introdued for this inverter system is described, and its simulation results are evaluated and discussed herein.<br/>
The Study on MPPT algorithm for Partial shade compensation
T.K. Kang,K.H. Koh,K.J.Choi,M.J.An,M.Nakaoka,Y.K.Lee,H.W. Lee 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
In this paper, compare and analyze existent MPPT algorithms. Existent algorithms have defects which don't generate it in a partial shade or low insolation. Therefore, to supplement it, we design improved IncCond algorithm consisted of a Aux. switch and capacitor with Generation Control circuit which can always obtain maximum generation power at the factor which is reduced generational efficiency by partial shade. Generation Control circuit is method which can always get maximum output power as it regularly controls each voltage of serial connected solar cell. Accordingly, it can improve efficiency and confidence of utility interaction inverter.<br/> The construction of the system is used a low price PIC16F87X. We analyze special character according to system operation through simulation and prove the validity through experiments
SUPER LOW SPEED CONTROL FOR LIM
Y.Ogino,K.Abe,K.Ohishi,M.Nakaoka,H.Fukuda,Y.Takakado,K.Nakano,Y.Murakami 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
This paper proposes the super low speed control method for LIM (Linear Induction Motor). The feasibly-proposed control method is based on the vector-control strategy using the current controlled VVVF inverter. Using this control implementation, both the quick speed response and the smooth thrust characteristics are realized in the super low speed range. The experimental results provide its desired operating characteristics in this system.<br/>
Progress in R&D of coated conductor in M-PACC project
Izumi, T.,Ibi, A.,Nakaoka, K.,Taneda, T.,Yoshida, T.,Takagi, Y.,Nakamura, T.,Machi, T.,Katayama, K.,Sakai, N.,Yoshizumi, M.,Koizumi, T.,Kimura, K.,Kato, T.,Kiss, T.,Shiohara, Y. The Korea Institute of Applied Superconductivity a 2014 한국초전도저온공학회논문지 Vol.16 No.2
The five-year national project in Japan for R&D of coated conductors and applications, named as the Materials and Power Applications of Coated Conductors (M-PACC) project, was finished at the end of FY2013. The project consists of four sub-themes as cable, transformer, SMES and coated conductors. In the theme of coated conductors, the fabrication process had been developed to satisfy the requirements from the applications such as in-field $I_c$ performance, low AC loss in the long tapes etc. Through the project, the remarkable progress was achieved as follows; a high in-field minimum $I_c$ value over 54A/cm-width under 3T at 77K was realized in a 200m long EuBCO tape with artificial pinning centers of $BaHfO_3$ by the pulsed laser deposition (PLD) technique on the IBAD template. On the other hand, the AC loss reduction was confirmed in the tapes fabricated by both PLD and the metal organic deposition (MOD) techniques by scribing 100m tapes into 10-filamments. Additionally, the mechanism of the delamination phenomenon was systematically investigated and the strength was improved by eliminating the origins of the weak points in the films. Through the development, all targeted goals were accomplished and the several results were appreciated as a world champion data.
ZVS-PWM Boost Chopper-Fed DC-DC Converter with Load-Side Auxiliary Edge Resonant Snubber
K.Ogura,S.Chandhaket,S.Nagai,T.Ahmed,M.Nakaoka 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
This paper presents a high-frequency ZVS-PWM boost chopper-fed DC-DC converter with a single active auxiliary edge-resonant snubber which is used for power conditioner such as solar photovoltaic generation and fuel cell generation The experimental results of boost chopper fed ZVS-PWM DC-DC converter are evaluated in addition to Its switching voltage and current waveforms, and the switching V-I trajectory of the power devices are discussed and compared with the conventional hard switching DC-DC converter treated here The temperature performance of IGBT module, efficiency, and EMI noise characteristics of this ZVS-PWM DC-DC converter using IGBTs are measured and evaluated from an experimental point of view
Sinewave-PWM ZVS Inverter using High-frequency Transformer for Utility AC Voltage Ink
S Chandhket,K Ogura,Y Konishi,M Nakaoka 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
This paper presents a novel prototype of the utility-interfaced si- nusoidal pulse width modulated (SPWM) inverter using the high-frequency fiyback transformer for the small-scale solar photo- voltaic power conditioner (lkW - 4kW) The proposed SPWM power conditioner circuit with a high-frequency link has a function of electrical isolation, which is vital for solar photovoltaic power conditioner systems with the viewpoint of safety and convenience The discontinuous conduction mode (DCM) operation of the fly. back transformer is also maintained to simplify the topology of the inverter circuit and control scheme first, the operating principle of the proposed circuit is described for the understanding of the circuit parameters establishment. Then, the digitally constructed SPWM control scheme is presented The proposed circuit is verified by the computer Simulation and the prototype experiment<br/>
Efficient Linear Generator Design with Reduced Output Voltage Harmonics
Ahmad M. Eid,S. K. Kwon,Ki-Young Sub,Hyun Woo Lee,Mutsuo Nakaoka 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Two-dimensional finite element method was used in the analysis to calculate the magnetic field parameters in a radial permanent magnet linear single-phase AC alternator. Both surface (SPM-LA) and internal permanent magnet (IPM-LA) prototype schemes are analyzed and compared according to three different parameters; the cogging force, the induced AC voltage and the THD of the induced AC voltage. Three different methods were used to reduce the THD of the induced voltage, tooth shoe, stepped tooth and chamfered tooth. It was found that the cogging force of the IPM-LA prototype scheme is always less than that of SPM-LA configuration due to the pole shoe. The stepped and chamfered tooth methods could achieve standard values for the THD of the induced voltage of the SPM-LA scheme. The cogging force was much reduced using the stator optimal length; for both schemes, as well as, the total alternator weight is reduced.
Y.Konishi,S.Chandhaket,K.Ogura,M.Nakaoka 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents a novel prototype of the utility-interactive voltage source type sinewave pulse modulated power inverter using a high-frequency flyback transformer link The proposed power conditioner circuit for the solar photovoltaic generation and small scale fuel cell has an isolation function due to the safety of the power processing system, which is more cost effective and acceptable for the small-scale distributed renewal energy conditioning and processing systems. The discontinuous current mode(DCM) of this power processing conversion circuit is applied to implement a simple circuit topology and pulse modulated control scheme. Its operation principle is described on the basis of simulation evaluations and theoretical considerations. The simulation results obtained herein prove that the proposed inverter outputs with sinusoidal waveforms and unity power factor currents are synchronized to the main voltage in utility power source grid. In this paper, the soft switching topology of high-frequency linked sinewave pulse modulation inverter is proposed and discussed.<br/> Index Terms -High frequency link, Flyback transformer link, Sinewave modulated inverter, Utility interactive power processing, Solar photovoltaic power conditioner, Renewal conversion energy and sustainable energy, Soft-switching topology.<br/>