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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 3, Issue 4 - Dec 1998
Volume 3, Issue 3 - Sep 1998
Volume 3, Issue 2 - Jun 1998
Volume 3, Issue 1 - Mar 1998
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Solenoid Valve DCC-PWM Control for Diesel Engines Fuel Pump
The Transactions of the Korean Institute of Power Electronics, volume 3, issue 2, 1998, Pages 85~91
This paper describes an study electric injection system for diesel engines. It is needed effective fuel injection which controls the solenoid valve of fuel pump. To solve this, this paper proposes DCC-PWM method which can realize fast reply and low holding current for solenoid valve on/off. For the proposed design method, simulation tools of ACSL are used to analyze the system. And the single-chip microcomputer is used to reduce the size of controller and to improve flexibility. And the systems validity can be verified through the experimental results.
Design of Digital Controller for Thyristor Controlled Arc Welding Machine
The Transactions of the Korean Institute of Power Electronics, volume 3, issue 2, 1998, Pages 92~98
With the development of semiconductor devices, adoption of microcontroller prevails in industrial area. But in are welding industry, there has not been much progress in adoption of microcontroller technology. Therefore, this paper shows the application of digital control technology to welding machine. This paper presents the design of microcontroller that is appropriate for three phase
gas metal are welding machine. By using microcontroller in
gas metal are welding machine, the overall cost can be reduced compared to analog comtroller. Also TMS370C850 microprocessor is used as overall microcontroller for the are welding machine.
Speed Control of Induction Motors Using Load Torque Feedforward Control
The Transactions of the Korean Institute of Power Electronics, volume 3, issue 2, 1998, Pages 99~106
This paper proposed a speed control system for induction motors robust to variations in torque and parameters by feedforward compensating the current portion of load torque, adding a load torque observer to the conventional PI controller in the indirect vector controlled induction motor system. Computer simulations and exeperimental works using the proposed control confirm that the transient response for the variation of the reference speed and load torque becomes improved, compared with the conventional PI controled method.
Deadbeat Controller Design of a ZCS-type Power Factor Correction Circuit(QBSRR)
The Transactions of the Korean Institute of Power Electronics, volume 3, issue 2, 1998, Pages 107~117
In this paper, a deadbeat controller design technique is developed for the recently introduced PFC(Power Factor Correction) circuit named as a QBSRR(Quantum Boost Series Resonant Rectifier) to achieve the fast dynamic responses of the output voltage in the presense of any load variations. And, in order to monitor the load information without employing the current sensor, the load estimation method is also derived. By using the information of the load estimation method, the proposed controller gain is automatically adjusted to have the system always keep the very fast dynamic responses. To verify these superior performances, the simulation and the experiment are carried out.
Linearization and harmonic analysis of output voltages in overmodulation range of space vector PWM
The Transactions of the Korean Institute of Power Electronics, volume 3, issue 2, 1998, Pages 118~124
This paper describes a relationship of a space vector PWM and a sinusoidal PWM and presents that the space vector PWM can produce linearly the output voltage to the unity MI(modulation index). At first, reference angles and holding angles are derived from expanding a Fourier series of the reference voltage waveform and then the angles are used for the inverter switching to linearize transfer characteristics of the inverter. In addition, the harmonic components of the output voltage are analyzed and on-line control is shown to be feasible by approximating in piecewise-linearization the reference and holding angles versus the MI. In V/f control of the induction motor, it is verified by the experiment that the motor current is changed smoothly for the variation of the inverter input voltage and the change of the reference voltage.
A Novel Flux Calculator for the Field Oriented Control of an Induction Motor without Speed Sensors
The Transactions of the Korean Institute of Power Electronics, volume 3, issue 2, 1998, Pages 125~130
This paper describes a novel flux calculator for the estimation of real rotor flux angle which is indispensable to the field oriented control of induction motors. A pure integrator is used to estimate the real rotor flux precisely from voltage and current information. The proposed flux calculator adopts the new drift compensation method to overcome the drift problem of pure integrator. The motor speed is calculated using estimated flux angle and estimated slip frequency. The performance of this approach is verified through the experiment. The experimental results shows stable operation of proposed system even below 1/100 of rated speed.
A Study on the Utility Interactive Photovoltaic System using a Chopper and a PWM Inverter
The Transactions of the Korean Institute of Power Electronics, volume 3, issue 2, 1998, Pages 131~137
The solar cells should be operated at the maximum power point because its output characteristics are greatly fluctuated on the variation of insolation, temperature and load. Photovoltaic system needs an inverter which can interface the dc output power of solar cell with the residential ac load. The inverter has to supply a sinusoidal current and voltage to the load and the utility line with a high power factor. This paper proposes an utility interactive photovoltaic system designed with a step-up chopper and a PWM voltage source inverter. The step-up chopper operates in continuous mode by adjusting the duty ratio so that the photovoltaic system tracks the maximum power points of solar cell without any influence on the variation of insolation and temperature. The voltage source inverter operates in a manner that its output voltage is in phase with the utility voltage. The inverter supplies an ac power with high factor and low level of harmonics to the load and the utility power system.
Speed Control of Induction Motor for Electric Vehicles Using Fuzzy Controller
The Transactions of the Korean Institute of Power Electronics, volume 3, issue 2, 1998, Pages 138~147
This paper describes design and implementation results of a fuzzy logic speed controller of EV(Electric vehicle)'s induction motor for the purpose of realizing comfortable driving. The fuzzy controller is suitable for speed control of EV since that without detailed knowledge about the induction motor, it is easier to design a well-performing speed control system with good stability. PWM wave for driving the induction motor is generated by space vector modulation method and all the control algorithms are realized digitally. The results of experiment show excellence of the proposed system and that the proposed system is appropriate to control the speed of induction motor for commercial EVs.
Analysis and Implementation of Single-Stage AC/DC Converter with Magnetic Energy Feedback Technique for Power Factor Correction
The Transactions of the Korean Institute of Power Electronics, volume 3, issue 2, 1998, Pages 148~155
A novel single-switch, single-stage, AC/DC forward converter with transformer magnetic energy feedback technique for power factor correction is proposed. The operational principle and analysis of the proposed converter is presented. The proposed converter gives the good power factor correction, low line current harmonic distortions, and tight output voltage regulation. The prototype shows the IEC 555-2 requirements are met satisfactorily with nearly unity power factor.
Optimal Control of a Three-Phase Voltage-Source PWM Converter with an Expanded Operation Region
The Transactions of the Korean Institute of Power Electronics, volume 3, issue 2, 1998, Pages 156~164
The operation regions of a three-phase(3Ø) voltage-source(VS) PWM converter are classified in the current vector plane of the synchronous reference frame and their characteristics are explained. In the the power-factor decreasing region, the current control with unity power-factor can not give satisfactory performance to the given load because of the distortion of input current and the ripples and the steady-state errors in DC link voltage. In this paper, the derivation of the optimal current vector is proposed to solve these problems. With this, the input current can be controlled sinusoidally with available maximum power factor and the DC link voltage be the given load, resulting the expansion of the operation region of the 3Ø VS PWM converter. The validity of the proposed control method is proved by the experimental results.