Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Transactions of the Korean Institute of Power Electronics
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
Editor in Chief :
Volume & Issues
Volume 9, Issue 6 - Dec 2004
Volume 9, Issue 5 - Oct 2004
Volume 9, Issue 4 - Aug 2004
Volume 9, Issue 3 - Jun 2004
Volume 9, Issue 2 - Apr 2004
Volume 9, Issue 1 - Feb 2004
Selecting the target year
Non-Contact Power Supply Using the Series-Parallel Resonant Converter
Kong Young-Su ; Kim Eun-Soo ; Yang Seung-Chul ; Kim Jong-Mu ; Shin Byung-Chul ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 405~412
In this paper, Non-contact power supply(NCPS) with the long primary cable longer than 20m and the large air-gap between the primary and secondary of Non-Contacting Transformer(NCT) is presented. The NCT has a large leakage inductance bigger than its magnetizing inductance because it has low coupling, and it is not efficient for NCPS to transfer the primary energy to the secondary one. In order to improve this problem, the voltage-gain characteristics of the series resonant converter, the parallel resonant converter, and the series-parallel resonant converter are analyzed respectively. In addition, the experimental results of 10kW prototype the series-parallel resonant converter is presented.
Rotor Time Constant Estimation for Induction Motor Direct Vector Control
Bae Sang-Jun ; Choi Jong-Woo ; Kim Heung-Geun ; Lee Hong-Hee ; Chun Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 413~419
In the induction motor direct vector control system using the Gopinath model flux observer, the deterioration of the dynamic response due to the detuned rotor time constant is investigated. To solve this problem, the on line estimation algorithm of the rotor time constant using model reference adaptive control is proposed. The effect of the motor parameter variation on the rotor time constant estimation is analyzed through experiment. The estimation error due to the parameter variation converges within 5%. Thus applying the proposed algorithm to the Gopinath model flux observer, the robust direct vector control system of the induction motor to the parameter variation can be implemented.
Design of the Robust Active Power Filter under the Unbalanced and Distorted Source Voltages in Three-phase Four-wire Systems
Min Joon-Ki ; Kim HyoSung ; Choi Jaeho ; Kim Kyung-Hwan ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 420~429
This paper proposes a novel current control strategy on active power filters using PQR instantaneous power theory which can compensate the line current harmonics and the neutral line current under the unbalanced and/or distorted source conditions in three-phase four-wire systems. The characteristics of the inverter ac filters are analyzed and a novel digital controller are proposed to overcome the inherent time delay problem in digital controllers with designed control gain in this paper. The proposed current control method is based on a sinusoidal PWM for fully-digital implementation compared with a conventional hysteresis PWM. PSiM simulation results verify the good performance of the proposed current control strategy on shunt type APFs.
Novel Two-Phase RPWM Technique for Three-Phase Induction Motor Drive
Lee Hyo-Sang ; Kim Nam-Joon ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 430~437
This thesis proposes novel SRP-PWM(Separately Random Pulse Position PWM) techniques and novel two-phase switching pattern applied to four-switch inverter, having various advantages such as operation time decrease that is required for decrease of switching damage, easy of implementation and inverter control at high frequency switching. In this thesis, we wish to confirm that SRP-PWM techniques disperse harmonic spectrum of inverter output current evenly into wide frequency area, that is, side-band of specification frequency. And we confirm the harmonic reduction effect of proposed techniques. Therefore, we will achieve an experiment by IGBT inverter using DSP and will verify the validity of proposed techniques compared with simulation results that use MATLAB/SIMULINK.
Half and Full-Bridge Cell based Stand-Alone Photovoltaic Multi-Level Inverter
Kang Feel-Soon ; Oh Seok-Kyu ; Park Sung-Jun ; Kim Jang-Mok ; Kim Cheul-U ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 438~447
A new multilevel PWM inverter using a half-bridge and full-bridge cells is proposed for the use of stand-alone photovoltaic inverters. The configuration of the proposed multilevel PWM inverter is based on a prior 11-level shaped PWM inverter. Among three full-bridge cells employed in the prior inverter, one cell is substituted by a half-bridge cell. Owing to this simple alteration, the proposed inverter has three promising merits. First it increases the number of output voltage levels resulted in high quality output voltages. Second, it reduces two power switching devices by means of employing a half-bridge cell. Third, it reduces power imposed on a transformer connected with the half-bridge unit. That is to say, most power is transferred to loads via cascaded transformers connected with low switching inverters, which are used to synthesize the fundamental output voltage levels whereas the output of a transformer linked to a high switching inverter is used to improve the final output voltage waves; thus, it is desirable in the point of the improvement of the system efficiency. By comparing to the prior 11-level PWM inverter, it assesses the performance of the proposed inverter as a stand-alone photovoltaic inverter. The validity of the proposed inverter is verified by computer-aided simulations and experimental results.
Rotor Position Detection of a Toroidal Switched Reluctance Motor Using Interior Central Pole Search Coils
Yang Hyong-Yeol ; Lim Young-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 448~456
This paper presents a new method of detecting rotor position in Toroidal Switched Reluctance Motor (TSRM). In this paper, low cost and robust characteristics of rotor position detection method are focused in order to compensate for disadvantage of general sensors. Search coils wound through the hole of the stator poles are used for detection of the rotor position in TSRM. Rotor position detection is achieved through electromotive force patterns induced by time-varying flux linkage in the search coils and then adequate phase is excited for drive. The validity of the method is verified by experimental results.
Photovoltaic Generation by Parallel Driving of Modified Buck-boost Converter
Lee Hee-Chang ; Park Sung-Jun ; Park Soo-Sik ; Moon Chae-Joo ; Lee Man-Hyung ; Kim Jong-Dal ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 457~466
In this paper, a modified converter is presented and analyzed to use as a photovoltaic converter. And also a new parallel driving scheme is proposed to increase output power and to reduce the output voltage ripple. The ratio of the output to the input voltage of the modified converter is equal to that of the boost converter. The difference between both converters is the composition of output terminal. Owing to the discrepancy, a working voltage of the output capacitor of the modified converter becomes lower, thus the capacitance value of the capacitor can be smaller than that of the boost converter. The proposed parallel driving is based on the modified converter and a current-mode-control method. It gives a good solution for alleviating the current sharing unbalance problem of conventional parallel operations. It reduces the output voltage ripple by means of increasing the equivalent switching frequency without additional switching losses. The validity of the proposed parallel driving strategy is verified through computer-aided simulations and experimental results.
Performance Improvement of Servo System in the Low Speed Operation Region Using RBFN Disturbance Observer
Lee Kyo-Beum ; Yoo Ji-Yoon ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 467~477
A new scheme to estimate the moment of inertia in the servo motor drive system in very low speed is proposed in this paper. The typical speed estimation scheme in most servo system for low speed operation is sensitive to the variation of machine parameters, especially the moment of inertia. To estimate the motor inertia value, the observer using the Radial Basis Function Networks(RBFN) is applied. The effectiveness of the proposed inertia estimation method is verified by experiments. It is concluded that the speed control performance in the low speed region is improved with the proposed disturbance observer using RBFN.
A Generalization of High Frequency Converter with Lossless Snubber Cell
Joung Gyu-Bum ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 478~484
In this paper, two lossless snubber cells are proposed to generalize high frequency converter with losslless snubber. The selecting of snubber cells, which generalize high frequency converters, are depended on converter topologies. The cells have a saturable inductor, LC resonant tank and two diodes. In the cells, the saturable inductors extremely reduce resonant energy in the LC resonant tank. By minimizing resonant energy, the converter, which applies snubber cells, can operate at high frequency. These cells are applied for Buck, Boost, Buck-Boost, Cuk, ZETA, and SEPIC to generalize converter which have lossless snubber. The boost type converter has been implemented, with 400 kHz switching frequency for 125 W load to verify the converter characteristics.
A Study on Precision Position Measurement Method for Analog Quadrature Encoder
Kim Myong-Hwan ; Kim Jang-Mok ; Kim Cheul-U ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 485~490
This paper presents a new interpolation algorithm for measuring high resolution position information which is prepared to a nino servo control motor using analog quadrature encoder. In the past, there are large capacity of memory(ROM or RAM) and two high price and resolution A/D(Analog-to-Digital Converter) for sensing two quadrature signals from a analog sinusoidal encoder interpolation. But high resolution of position from sinusoidal encoder can be obtained by using only small capacity of memory, one A/D converter and comparator. Experimental results show that the proposed algorithm is useful for measuring high resolution position.
A Rotor Position Estimation of Brushless DC Motors using Neutral Voltage Compensation Method
Song Joong-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 491~497
This paper presents a new rotor position estimation method for brushless DC motors. It is clear that the estimation error of the rotor position provokes the phase shift angle misaligned between the phase current and the back-EMF waveforms, which causes torque ripple in brushless DC motor drives. Such an estimation error can be reduced with the help of the proposed neutral voltage-based estimation method that is structured in the form of a closed loop observer. A neutral voltage appearing during the normal mode of the inverter operation is found to be an observable and controllable measure, which can be dealt with for estimating an exact rotor position. This neutral voltage is obtained from the DC-link current, the switching logic, and the motor speed values. The proposed algorithm, which can be implemented easily by using a single DC-link current and the motor terminal voltage sensors, is verified by simulation and experiment results.
A Study on the Algorithm Detecting DC Line Faults
Kim Chan-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 498~506
The protection algorithm of DC line grounding for the subway is proposed in this paper. Compared to the conventional protection algorithm, the proposed algorithm has a advantage that can distinguish the difference between service line and faulted line. The contents of the proposed algorithm are by using blocking filter and PLC(Power Line Carrier). Results of the simulation show that the proposed algorithm is very useful.
Technique of Common Mode Voltage and Conducted EMI Reduction using Nonzero-vector State in SVPWM Method
Hahm Nyon-Kun ; Kim Lee-Hun ; Jeon Kee-Young ; Chun Kwang-Su ; Won Chung-Yuen ; Han Kyung-Hee ;
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 5, 2004, Pages 507~515
With the advent of fast power devices, the high dv/dt voltage produced by PWM inverts have been found to cause EMI noise, shaft voltage and bearing current. This paper describes the application of newly developed Conducted EMI reduction SVPWM technique in induction motor drives. The newly developed common mode voltage reduction SVPWM technique don't use any zero-vector states for inverter control, hence it can restrict the common mode voltage more than conventional PWM technique. The validity of the proposed technique by software approach is verified through simulation and experimental results.