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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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Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 12, Issue 6 - Dec 2007
Volume 12, Issue 5 - Oct 2007
Volume 12, Issue 4 - Aug 2007
Volume 12, Issue 3 - Jun 2007
Volume 12, Issue 2 - Apr 2007
Volume 12, Issue 1 - Feb 2007
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Characteristic Analysis of Independent 3 phase BLDC Motor
Jo, Kwan-Jun ; Oh, Jin-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 4, 2007, Pages 277~284
This paper describes independent phase BLDC motor with a maximum torque among BLDC motor used for electric propulsion system Independent phase BLDC motor has characteristic that phases of stator we independent electrically. This paper is modeling two type of 3 phases BLDC motors, one has Y-connection type and the other has independent type, and it shows simulation of them, compares its characteristics. As a result of simulation, phase voltage of independent 3 phase BLDC motor is higher than Y-connection three phase BLDC motor. When the stator resistance and inductance are stable, high phase voltage causes an increase in maximum phase current and an increases in it serially causes an increase of maximum torque. It is also found that the current pulsation of independent phase BLDC motor was decreased by controlling phase current of independent BLDC motor.
A Fuel Cell System with Z-Source Inverter and Ultracapacitors
Kim, Yoon-Ho ; Lee, Uk-Young ; Kim, Soo-Hong ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 4, 2007, Pages 285~290
When input parameters like gas volume or load of the fuel cell system is changed, the fuel cell system can generate transient voltage disturbances. In this paper, a fuel cell system with Z-source inverter and ultracapacitors for voltage disturbance compensation is proposed. The structure of Z-source inverter is simple. It has unique features that can boost/buck input voltage with a DC/DC converter using only a modified switching pattern. The characteristics of the proposed topologies for the fuel cell system with Z-source inverter and ultracapacitors are analyzed using simulation, and verified by experiments. The simulation and experimental results show that the proposed system is capable of operating with stable response to the system transient and voltage disturbances.
Maximum Torque Per Ampere Operation Point Tracking Control for Permanent Magnet Synchronous Motors
Lee, Kwang-Woon ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 4, 2007, Pages 291~299
To operate a permanent magnet synchronous motor (PMSM) at a maximum torque per ampere (MTPA) operation point, the exact values of machine parameters such as inductances and back-EMF constant, which are sensitive to motor phase currents and temperature respectively, should be blown. An adaptive estimation method for on-line estimation of the machine parameters is not suitable for practical applications since it has difficulties in estimating exact values and requires complex mathematical calculations. The purpose of this paper is to present a simple MTPA operation point tracking control strategy for vector controlled PMSM drives with slow dynamic loads. The proposed method searches MTPA operation points by modulating current phase angle and observing the variation in command power. The current angle modulation strategy is designed to sense the effect of load variations in the command power. Therefore, the proposed method can track the MTPA operation points of the PMSM regardless of load variations. Computer simulation and experimental study is also presented to show the effectiveness of the proposed method.
A Grid-interactive PV Generation System with the Function of the Power Quality Improvement
Ko, Sung-Hun ; Cho, Ah-Ran ; Kang, Dae-Up ; Park, Chun-Sung ; Jeon, Chil-Hwan ; Lee, Seong-Ryong ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 4, 2007, Pages 300~309
In this paper, a grid-interactive photovoltaic (PV) system with the function of the power quality improvement is presented. The proposed system requires only one current-controlled voltage source inverter, which control the current flow at low total harmonic distortion and unity power factor, as well as simultaneously provide reactive power support. The proposed system operation has been divided into two modes (sunny and night). In night mode, the system operates to compensate the reactive power demanded by nonlinear or variation in loads. In sunny mode, the system performs power quality control (PQC) to reduce harmonic current and to improve power factor as well as maximum power point tracking (MPPT) to supply active power from the PV arrays, simultaneously. To verify the proposed system a comprehensive evaluation included simulation and experimental results are presented.
Vector Control for Two-Phase Inverter-Fed Two-Phase Induction Motors
Jang, Do-Hyun ; Cho, Young-Hoon ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 4, 2007, Pages 310~317
In this paper, the system equation for the balanced two-phase induction motor is derived and the characteristics for speed control is also analyzed in the region of constant torque and constant power. The modified vector control theory is applied to two-phase motor drive system. The speed of two-phase motor drive can be controlled precisely by the modified indirect vector control theory. The modified vector control theory is simpler comparing to the conventional vector control because of the simpler axis transformation. The computer simulations and the experimental results presented to confirm the vector control for two-phase inverter fed two phase induction motor system.
Field Weakening Operation of a High Torque Density Five Phase Permanent Magnet Motor Drive
Kim, Nam-Hun ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 4, 2007, Pages 318~323
This paper investigates the field weakening operation of a five-phase permanent magnet motor. The proposed motor has concentrated windings such that the produced back-EMF is almost trapezoidal and is supplied with the combined sinusoidal plus third harmonic of currents to produce trapezoidal current. Therefore this motor, while generating the same average torque as an equivalent permanent magnet brushless dc motor, overcomes its disadvantages. It is shown that torque producing and flux producing components of current for this motor can be decoupled by using multiple reference frame transformation. Therefore, Vector control is easily applicable to the motor. This motor has benefits such as high torque density of a BLDC motor below the rated speed and controllability of PMSM above the rated speed and during the field weakening region and simulation and experimental results are provided to prove the validity of the superior performance of this drive.
State of Charge Estimator using Sliding Mode Observer for Hybrid Electric Vehicle Lithium Battery
Kim, Il-Song ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 4, 2007, Pages 324~331
This paper studies new estimation method for state of charge (SOC) of the hybrid electric vehicle lithium battery using sliding mode observer. A simple R-C Lithium battery modeling technique is established and the errors caused by simple modeling was compensated by the sliding mode observer. The structure of the sliding mode observer is simple, but it shows robust control property against modeling errors and uncertainties. The performance of the system has been verified by the UUDS test. The test results of the proposed observer system shows robust tracking performance under real driving environments.
Analysis and Control of Z-Source Inverter using Modified Space Vector Methods
Chun, Tae-Won ; Tran, Quang-Vinh ; Kim, Heung-Gun ; Nho, Eui-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 4, 2007, Pages 332~338
In this paper, the three modified space vector modulation methods are suggested in order to control effectively the shoot-through time at Z-source inverter. Both the switching patterns of three modulation methods and the modulation signals with a variation of shoot-through time are analyzed. The optimum modified space vector modulation method is determined by both the control range of the shoot-through time and the symmetry of the switching pattern and modulation signal. The performances of modulation methods are verified with the simulation results with 32-bit DSP.
Implementation of a Fast Current Controller using FPGA
Jung, Eun-Soo ; Lee, Hak-Jun ; Sul, Seung-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 4, 2007, Pages 339~345
This paper presents a design of an FPGA (Field Programmable Gate Array) -based currentcontroller. Using the nature of the high computational capability of FPGA, the digital delay due to the algorithm execution can be reduced. The control performance can be better than the conventional DSP (Digital Signal Processor)-based current controller. Moreover, this method does not need any delay compensation algorithm because the digital delay is physically diminished. Therefore, the bandwidth of the current controller can be extended by this method. The feasibility of this method is verified by several experimental results under the various conditions.
Filter Design for Utility Interactive Inverters using Single-phase Full-bridge Topology
Kim, Hyo-Sung ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 4, 2007, Pages 346~353
This paper deals with filter design for utility-interactive voltage-sourced PWM inverters built by single-phase full-bridge topology By analyzing the relation between utility voltage and the ac output voltage of single-phase half-bridge inverters, the instantaneous voltage applied on the filter inductor is deduced qualitatively and quantitatively. Moreover, switching ripple current through the filter inductor is calculated from the filter inductor voltage. Based on the above mentioned analysis, filter design method is proposed by evaluating the percentage of the switching ripple current against the rated fundamental current. Proposed filter design method is verified by simulation and experiment.