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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 1, Issue 1 - Nov 1996
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RECENT TRENDS OF POWER ELECTRONIC INDUSTRY IN CHINA
Qian, Z.M. ; He, X. ;
The Transactions of the Korean Institute of Power Electronics, volume 1, issue 1, 1996, Pages 1~6
Recent trends of the power electronic industry in China have been summarized in this paper. Based on the applications of the power electronic products in the chinese industries the production trends of power semiconductor devices, drives, power supplies, power electronic industry used in power systems in China have been briefly reviewed.
Digital Current Controller with Smith-Predictor for PWM Converters
Lee, Jin-Woo ;
The Transactions of the Korean Institute of Power Electronics, volume 1, issue 1, 1996, Pages 7~11
From the cost-effective point of view, it is very important to design a current with the highest utilization factor of current capacity of power devices. This can be accomplished by a current controller without overshoot irrespective of the varying bounds of control voltage in PWM converters and the dead time due to the time delay. This paper suggests a novel decoupled controller with Smith-Predictor which has the fast control response without overshoot and steady stats error and also deal with the design method of the controller for PWM converters. The extensive digital simulations done by SIMULINK/MATLAB show that the suggested controller guarantees the full utilization of current capacity of power devices and the decoupled current control behavior.
Instantaneous Speed and Mechanical Inertia Moment Estimation for the improvement of the Low Speed Control Characteristics of Induction Machines
Hyun, Dong-Seok ; Kim, Nam-Joon ;
The Transactions of the Korean Institute of Power Electronics, volume 1, issue 1, 1996, Pages 12~19
The purpose of this paper is the improvement of the speed control characteristics of induction machines suited the low resolution incremental-type encoder in a low speed region. In order to improve the control characteristics in a low speed range, we propose that the instantaneous speed control method by the instantaneous speed detection which is implemented by the disturbance torque observer. Also, in case of the speed control by the instantaneous speed detection, the simple estimation method of the mechanical inertia moment is proposed. We will the carry out the mathematical verification of the proposed theory by the theoretic advisement connected with the convergence relationship of the estimated inertia moment to the real mechanical inertia moment. Computer simulations and experiments by the IGBT inverter adopting DSP is performed to verify the proposed method.
Improvement of Starting Characteristics of Single Phase Induction Motor by Phase Angle Voltage Controller
Lim, Yang-Su ; Baek, Hyung-Lae ;
The Transactions of the Korean Institute of Power Electronics, volume 1, issue 1, 1996, Pages 20~26
The common drive method of the single phase induction motor(SPIM) is to install a start capacitor and a centrifugal switch in series with the auxiliary winding. In this paper, the phase angle voltage sequence controller is proposed to eliminate a start capacitor and a centrifugal switch of SPIM. In comparison with the capacitor start system of SPIM, the proposed control system shows that it contributes to saving the starting current about 57% and to improving of the starting efficiency of SPIM. The proposed starting characteristics of the SPIM is obtained with this strategy through simulation and experimental results.
Maximum Efficiency Drive of Vector-Controlled Induction Motors
Yoon, Duck-Yong ; Choe, Gyu-Ha ; Hong, Soon-Chan ; Baek, Soo-Hyun ; Lee, Eun-Woong ;
The Transactions of the Korean Institute of Power Electronics, volume 1, issue 1, 1996, Pages 27~37
This paper proposes the control algorithm for maximum efficiency drive of PWM inverter - induction motor system with high dynamic performance. If the induction motor is driven under light load with rated magnetizing current, the Iron loss is excessively large compared with the codder loss which results in doer motor efficiency. Maximum efficiency drive of an induction motor can be achieved by controlling the magnetizing current to satisfy the optimal ratio that leads the total motor loss to be a minimum value at a given speed. The proposed control algorithm essentially uses vector control technique and adopts voltage decoupling control strategy to prevent the degradation of dynamic performance due to reduced magnetizing current. To verify the proposed method, digital simulations and experiments are carried out for a squirrel-cage induction motor with the rating of 2.2[kW].
Commutation Performance of Current Source Converters fed Switched Reluctance Motors
Jang, Do-Hyun ; Choe, ㅍ ; Kim, Ki-Su ; Jeong, Seon-Ung ;
The Transactions of the Korean Institute of Power Electronics, volume 1, issue 1, 1996, Pages 38~46
The commutation operation of the current source converter for switched reluctance motor drives is analyzed in this paper. The commutation operation in the current source converter consists of two modes. At turn-off of phase switch, the phase current decreases sinusoidally, and the sum of two phase currents during commutation period is constant. At this time, the capacitor voltage increases quickly with changing polarity and decreases slowly when another phase switches turn on or off. Frequency of step-down DC chopper in the current source converter is low because of the dump such as BJTs and GTOs are possible as phase switches instead of Power MOSFET and IGBTS. They may result in reductions of conduction losses and manufacturing cost in the current source converter comparing to the voltage source converter of SRM.
New Technology of Static Excitation System Considering Dynamic Stability
Rhew, Hong-Woo ; Kim, Chan-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 1, issue 1, 1996, Pages 47~55
A new generator excitation system using a boost-buck chopper as a kind of static exciters is proposed to overcome the lack of field forcing capability of the bus fed exciter under the input line fault condition. It increases or maintains the generator field current by boosting the field voltage in the case of the input AC line voltage drop during and immediately after a fault. The validity of the proposed excitation system is verified with the computer simulation. The generator stability according to the each difference exciter is tested using a commercial software package-CYME. The simulation results of the stability analysis on the generator with the proposed exciter is better than that of the bus fed exciter. This boost-buck chopper exciter can be simply implemented and controlled by the modern power electronics technology.