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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Power Electronics
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 2, Issue 4 - Oct 2002
Volume 2, Issue 3 - Jul 2002
Volume 2, Issue 2 - Apr 2002
Volume 2, Issue 1 - Jan 2002
Selecting the target year
A Maximum Power Point Tracking Control for Photovoltaic Array without Voltage Sensor
Senjyu, Tomonobu ; Shirasawa, Tomiyuki ; Uezato, Katsumi ;
Journal of Power Electronics, volume 2, issue 3, 2002, Pages 155~161
This paper presents a maximum power point tracking algorithm for Photovoltaic array using only instantaneous output current information. The conventional Hill climbing method of peak power tracking has a disadvantage of oscillations about the maximum power point. To overcome this problem, we have developed an algorithm that will estimate the duty ratio corresponding to maximum power operation of solar cell. The estimation of the optimal duty ratio involves, finding the duty ratio at which integral value of output current is maximum. For the estimation, we have used the well know Lagrange's interpolation method. This method can track maximum power point quickly even for changing solar isolation and avoids oscillations after reaching the maximum power point.
Voltage Sag Detection Algorithm for Instantaneous Voltage Sag Corrector
Lee, Sang-Hoon ; Choi, Jae-Ho ;
Journal of Power Electronics, volume 2, issue 3, 2002, Pages 162~170
Voltage sag detection algorithm for voltage sag corrector is proposed in this paper. To quantify the standard of voltage unbalance under the faulted conditions, the 3-phase unbalanced voltages are decomposed into two balanced 3-phase symmetrical components of the positive and negative sequence voltages, which is defined by the magnitude factor (MF) and unbalance factor (UF). It is analyzed that MWF and UF values are given as the dc constant values even though under the voltage unbalance condition. This paper also proposes the control scheme of the instantaneous voltage sag corrector based on this detection algorithm. The validity of the proposed algorithm is verified through the EMTDC simulation and experiments.
Passive Transient Voltage Suppression Devices for 42-Volt Automotive Electrical Systems
Shen, Z.John ;
Journal of Power Electronics, volume 2, issue 3, 2002, Pages 171~180
New 42-volt automotive electrical systems can provide significant improvements in vehicle performance and fuel economy. It is crucial to provide protection against load dump and other overvoltage transients in 42-volt systems. While advanced active control techniques are generally considered capable of providing such protection, the use of passive transient voltage suppression (TVS) devices as a secondary or supplementary protection means can significantly improve design flexibility and reduce system costs. This paper examines the needs and options for passive TVS devices for 42-volt applications. The limitations of the commonly available automotive TVS devices, such as Zener diodes and metal oxide varistors (MOV), are analyzed and reviewed. A new TVS device concept, based on power MOSFET and thin-film polycrystalline silicon back-to-back diode technology, is proposed to provide a better control on the clamp voltage and meet the new 42-volt specification. Both experimental and modeling results are presented. Issues related to the temperature dependence and energy absorbing capability of the new TVS device are discussed in detail. It is concluded that the proposed TVS device provides a cost-effective solution for load dump protection in 42-volt systems.
Utility-Connected Solar Power Conditioner Using Edge-Resonant Soft Switching Duty Cycle Sinewave Modulated Inverter Link
Ogura, Koki ; Chandhaket, Srawouth ; Nakaoka, Mutsuo ; Terai, Haruo ; Sumiyoshi, Shinichiro ; Kitaizumi, Takeshi ; Omori, Hideki ;
Journal of Power Electronics, volume 2, issue 3, 2002, Pages 181~188
The utility interfaced sinewave modulation Inverter for the solar photovoltaic power conditioner with a high frequency transformer is presented for residential applications. As compared with the conventional full-bridge hard switching slnewave PWM inverter with a high frequency link, the simplest single-ended edge-resonant soft switching sinewave inverter with a sinewave duty cycle pulse control scheme is implemented, resulting in size and weight reduction, low cost and high efficiency This paper presents a prototype system of the sinewave zero voltage soft switching sinewave inverter for solar power conditioner, along with its operating principle and unique features. In addition to these, this paper discusses a control implementation to deliver high quality output current. Major design of each component and the power loss analysis under actual power processing is also discussed and evaluated from an experimental point of view A newly developed utility-connected sinewave power conditioning circuit which achieves 92.5% efficiency under 4kW output is demonstrated.
New Energy Recovery Concept for AC PDP Sustaining Driver Using Current Injection Method (CIM)
Lee, Jun-Young ; Kim, Jin-Sung ; So, Myeong-Seop ; Cho, Bo-Hyung ;
Journal of Power Electronics, volume 2, issue 3, 2002, Pages 189~198
New concept of energy recovery for plasma display panel (PDP) Is proposed. Different from conventional LC resonant sustaining drivers, the current built up before inverting the polarity of the panel electrodes is utilized to change the panel Polarity together with energy Previously charged in Panel capacitance. This operation Provides zero -voltage-switching of switches and reduction of EMI by rejecting the surge current when the sustain switches are turned on. The build-up current helps to reduce transition time of panel polarity and may produce more stable light waveforms. This method shows a desirable characteristic that the circuit loss is similar to that of series resonant type energy recovery circuit which is very effective method.
Comparison of Active-Clamp and ZVT Techniques Applied to Tapped-Inductor DC-DC Converter with Low Voltage and Bigh Current
Abe, Seiya ; Ninomiya, Tamotsu ;
Journal of Power Electronics, volume 2, issue 3, 2002, Pages 199~205
This paper compares three kinds of soft-switching circuits from viewpoints of surge suppression, load characteristic, and power efficiency for a tapped-inductor buck converter with low voltage and high current. As a result, these soft-switching techniques have achieved much higher efficiency of 80 % when compared with a hard-switching buck converter for the output condition of 1V and 20A.
Voltage Source Resonant Inverter for Excimer Gas Discharge Load
Koudriavtsev, Oleg ; Nakaoka, Mutsuo ;
Journal of Power Electronics, volume 2, issue 3, 2002, Pages 206~211
Silent gas discharge method has been widely applied fur ozone production, ultraviolet light and UV laser generation. Since ozone and ultraviolet applications have tendency to spread widely in industry, the development of efficient and low - cost power supply for such systems is an important task at present. This paper introduces high-frequency inverter type mode power supply designed fur ozone generation tube and ultraviolet generation excimer lamp and considerations on the design of the inverter and pulse density modulation control strategy applied in it.
Novel Modular 3-phase AC-DC Flyback Converter for Telecommunication
Park, Ju-Yeop ; Lee, Jong-Pil ; Kim, Taek-Yong ; Song, Joong-Ho ; Ick Choy ;
Journal of Power Electronics, volume 2, issue 3, 2002, Pages 212~219
A novel mode of parallel operation of a modular 3-phase AC-DC flyback converter for power factor correction along with tight regulation was recently analyzed and presented. The advantage of the proposed converter does not require expensive high voltage and high current devices that are normally needed in popular boost type 3-phase converter. In this paper tile detailed small signal analysis of the modular 3-phase AC-DC flyback converter is provided for control purpose and also experimental results are included to confirm the validity of the analysis.
Minimization of Losses in Permanent Magnet Synchronous Motors Using Neural Network
Eskander, Mona N. ;
Journal of Power Electronics, volume 2, issue 3, 2002, Pages 220~229
In this paper, maximum efficiency operation of two types of permanent magnet synchronous motor drives, namely; surface type permanent magnet synchronous machine (SPMSM) and interior type permanent magnet synchronous motor(IPMSM), are investigated. The efficiency of both drives is maximized by minimizing copper and iron losses. Loss minimization is implemented using flux weakening. A neural network controller (NNC) is designed for each drive, to achieve loss minimization at difffrent speeds and load torque values. Data for training the NNC are obtained through off-line simulations of SPMSM and IPMSM at difffrent operating conditions. Accuracy and fast response of each NNC is proved by applying sudden changes in speed and load and tracking the UC output. The drives'efHciency obtained by flux weakening is compared with the efficiency obtained when setting the d-axis current component to zero, while varying the angle of advance "
" of the PWM inverter supplying the PMSM drive. Equal efficiencies are obtained at diffErent values of
, derived to be function of speed and load torque. A NN is also designed, and trained to vary
following the derived control law. The accuracy and fast response of the NN controller is also proved.so proved.