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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Power Electronics
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The Korean Institute of Power Electronics
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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
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The Space Vector Detection based Three-Phase Hybrid Series Active Power Filter for Compensating Dynamic Voltage Sag and Harmonic Current
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 303~310
In this paper, for compensating dynamic voltage sag and harmonic current, 3-phase hybrid series active power filter based on the space vector detection is proposed. The Space vector algorithm for detecting the voltage sag and the harmonic current in compared with conventional theory is a simple method for calculating the compensating reference without any coordinated transformation. The effectiveness of the proposed system is verified by the PSIM simulation in the steady state and the transient state, which the proposed system is able to simultaneously compensate harmonics and source voltage unbalance / sag.
Low Cost Speed Control System of PM Brushless DC Motor Using 2 Hall-ICs
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 311~318
Generally, PM BLDC drive system is necessary that the three Hall-ICs evenly be distributed around the stator circumference and encoder installed in case of the 3 phase motor. The Hall-ICs are set up in this motor to detect the main flux from the rotor. So the output signal from Hall-ICs is used to drive a power transistor to control the stator winding current. Instead of using three Hall-ICs and encoder, this paper uses only two Hall-ICs for the permanent magnet rotor position and for the speed feedback signals, and uses a micro controller of 16-bit type(80C196KC) with the 3 phase PM BLDC whose six stator and two rotor designed. Two Hall-IC Hc and
are placed on the endplate at 120 degree phase difference. With these elements, we estimate information of the other phase in sequence through a rotating rotor.
A Study on SOC Algorithm and Design of Battery ECU for Hybrid Electric Vehicle
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 319~325
The major factors that make ZEV affordable are the range and cost. The development of advanced batteries such as Ni-MH battery can solve the problem partly； on the hand the battery management system is an efficient way. Ni-MH battery and battery ECU is a key component influencing ZEV performance, such as range, acceleration and hill-climbing capability. Because most problems related to battery such as short circuit, over-discharge and overcharge occur easily during operation, it is necessary to develop a dedicated battery ECU for HEV. This paper proposes a new SOC algorithm for the HEV based on the terminal voltage and current integration. And battery ECU was designed and analyzed. Also, the validity is confirmed through experiment.
A Double Coupling Full-Bridge Configuration Series Resonant Inverter
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 326~333
This research proposes a high frequency resonant inverter for high power conversion apparatus, which is consist of two L-C linked full-bridge inverter using MOSFET in order to distribute voltage and current of the devices. As an output power control strategy, the time sharing control method is applied. From the computer simulation results, the inverters and devices can be shared properly voltage and current rating of the system. And also, theoretical characteristics of the proposed circuit are compared with experimental results.
The Study on the HBML Inverter Using the Cascaded Transformers
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 334~340
In this paper, an efficient switching pattern to equalize the size of transformer is proposed for a multi-level inverter employing cascaded transformers. It is based on the prior selected harmonic elimination PWM(SHEPWM) method. Because the maximum magnetic flux imposed on each transformer becomes exactly equal each to each, all transformers can be designed with the same size regardless of their position. Therefore, identical full-bridge inverter units can be utilized, thus improving modularity and manufacturability. The fundamental idea of the proposed switching pattern is illustrated and then analyzed theoretically. The validity of the proposed switching strategy is verified by experimental results.
A Master and Slave Control Strategy for Parallel Operation of Three-Phase UPS Systems with Different Ratings
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 341~349
A parallel operation of Uninterruptible Power Supply(UPS) systems is used to increase power capacity of the system or to secure higher reliability at critical loads. In the conventional parallel operation, the load-sharing control to maintain the current balance is the most important, since the load-sharing is very sensitive to discord between components of each module, amplitude/phase difference, line impedance, output LC filter, and so on. To solve these problems various control algorithms are researching. However, these methods cannot apply to the different ratings of UPS. In the case, master and slave control algorithm for parallel operation is adequate. However, if the UPS ratings are different, the value of passive filters L, C is different, and it affects the sharing of current. This paper presents general problems of conventional parallel operation systems, and control strategy for parallel operation with different ratings. The validity of the proposed control strategy is investigated through simulation and experiment in the parallel operation system with two 3-phase UPS systems.
Design of a Heat Dissipation System for the 400kW IGBT Inverter
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 350~355
This paper deals with the design of a heat dissipation system, which consists of a heat source of power semiconductor devices, a heat sink ;md a fan for the forced air cooling. It suggests the method of appropriately dividing the whole heat transfer system into analytical subsystems and also presents the correspondent analytic or experimental design equations for the subsystems. The experimental results on the designed heat dissipation system for the 400kW IGBT inverter show less than 10［%］ error with respect to the design temperature and therefore verify the validity of the proposed analytical design method in the steady state.
Steady-State Performance Improvement of Single-Phase PWM Inverters Using PLL Technique
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 356~363
This paper presents a precision voltage control technique of a single phase PWM inverter for a constant voltage and constant frequency(CVCF) applications. The proposed control scheme employs an additional phase-locked loop(PLL) compensator which is constructed using the output capacitor voltage and current. The computer simulation and experiment are carried out for the actual single-phase PWM inverter and it is well demonstrated from these results that the steady-state performance and total harmonic distortion(THD) are remarkably improved by employing the proposed technique.
Novel RPWM Techniques for High-Speed Three-Phase Induction Motor Drive
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 364~371
This thesis is proposing novel RPWM(Random PWM) techniques that can locate PWM pulse to do random. RPWM techniques to propose locates SVPWM(Space Vector PWM) pulse by number of each random and principle to locate of pulse applies different random function and locate pulse. For propriety verification of proposed techniques, achieve an simulation and experiment that use MATLAB/SIMULINK about proposed RPWM techniques algorithm and IGBT inverter composition that use DSP(TMS320C31). Specially, analyze harmonic spectra of inverter output current when the induction motor speed is more than 10,000 rpm, confirm that RPWM's effect in high speed degree appears. Proposed RPWM techniques propriety prove from reduction effect of harmonic magnitude that corresponds to an integer times of switching frequency.
A Characteristic Analysis of Single-Power-Stage High Frequency Resonant AC-DC Converter with High Power Factor
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 372~380
This paper proposes a single-power-stage high frequency resonant AC-DC converter with high power factor using ZVS(Zero Voltage Switching), and integrates a conventional converter with two stage into single stage converter. Input power factor is possible to be improved as a high power factor because inductor for power factor correction(PFC) is connected in input and converter is operated in discontinued current mode(DCM) with constant duty cycle and variable switching frequency. The conventional converter with two stage need to add a switch in order to control a power factor, but single stage converter have a advantage that system is simple and cost is down, confidence is improved, etc. This paper described a operation principle and characteristic analysis for single stage AC-DC converter with high power factor and have evaluated characteristic values by using normalized parameter. We make a experimental equipment using MOSFET as a switching device on the basis of characteristic values obtained from characteristic evaluations and we conform a rightfulness of theoretical analysis by comparing theoretical waveforms and experimental waveforms.
Ripple Voltage Compensation Instantaneous Follow Controller of Inverter by using Analog Integrator
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 381~389
In this paper, it is suggested that instantaneous compensation PWM control for inverter without the smoothing capacitor Therefore, this inverter system has several advantages. It has small volume and low price to manufacture, decrease trouble rate of inverter, and has power factor correction effect because huge smoothing capacitor-less. And it has compact size control circuit to use analog integrator device. It could make the smoothing capacitor-less inverter for air-blower motor by using the instantaneous compensation PWM controller. This inverter system has small volume and value compare with the conventional VVVF control inverter.
A Study on the Operational Characteristics of PFC at Instantaneous Power Interrupt
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 390~396
Recently, there have been Increasing demands for high power factor and low harmonic distortion in the current drawn from utility. The harmonic limits imposed by international standards. It need the PFC techniques in order to reduce line current harmonics and comply with the standards. The average current control method that is the most proper PFC control method in a switching power supply of middle and high power has been used mostly to PFC control method. However, the switching device of PFC circuit has frequently destructed at power return after instantaneous power interrupt. Therefore, this paper have verified the cause of this problems and proposed the solution through simulation and experiment
Grid-Connected Variable Speed Wind Power Generation System Using Cage-Type Induction Generators
The Transactions of the Korean Institute of Power Electronics, volume 9, issue 4, 2004, Pages 397~404
This paper proposes a variable speed control scheme of grid-connected wind power generation systems using cage-type induction generators. The induction generator is operated in indirect vector control mode, where the d-axis current controls the excitation level and the q-axis current controls the generator torque, by which the speed of the induction generator is controlled according to the variation of the wind speed In order to produce the maximum output power. The generated power flows into the utility grid through the back-to-back PWM converter. The line-side converter controls the dc link voltage by the q-axis current control and can control the line-side power factor by the d-axis current control. Experimental results are shown to verify the validity of the proposed scheme.