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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Electrical Engineers P
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 54, Issue 4 - Dec 2005
Volume 54, Issue 3 - Sep 2005
Volume 54, Issue 2 - Jun 2005
Volume 54, Issue 1 - Mar 2005
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Speed and Position Sensorless Control of SPMSM with Adaptive Observer
Lee, Hong-Gyun ; Lee, Jung-Chul ; Cha, Young-Doo ; Chung, Dong-Hwa ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 54, issue 1, 2005, Pages 1~7
This paper is proposed the speed and position sensorless control of surface permanent magnet synchronous motor(SPMSM) with adaptive fuzzy and observer. A adaptive fuzzy controller is applied for speed control of SPMSM drive. A adaptive state observer is used for the mechanical state estimation of the motor. The observer was developed based on nonlinear model of SPMSM, that employs a d - q rotating reference frame attached to the rotor. A adaptive observer is implemented to compute the speed and position feedback signal. The validity of the proposed sensorless scheme is confirmed by various response characteristics.
HAI Control for Speed Control of SPMSM Drive
Lee, Hong-Gyun ; Lee, Jung-Chul ; Chung, Dong-Hwa ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 54, issue 1, 2005, Pages 8~14
This paper is proposed hybrid artificial intelligent(HAI) controller for speed control of surface permanent magnet synchronous motor(SPMSM) drive. The design of this algorithm based on HAI controller that is implemented using fuzzy control and neural network. This controller uses fuzzy rule as training patterns of a neural network. Also, this controller uses the back-propagation method to adjust the weights between the neurons of neural network in order to minimize the error between the command output and actual output. A model reference adaptive scheme is proposed in which the adaptation mechanism is executed by fuzzy logic based on the error and change of error measured between the motor speed and output of a reference model. The control performance of the HAI controller is evaluated by analysis for various operating conditions. The results of analysis prove that the proposed control system has strong high performance and robustness to parameter variation, and steady-state accuracy and transient response.
Power Loss Analysis according to Winding Array Method of High Frequency Transformer
Yoon, Shin-Yong ; Kim, IL-Nam ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 54, issue 1, 2005, Pages 15~19
This paper analyzed the power loss characteristics according to winding thickness and winding method of high frequency transformer. Power loss was analyzed by PExprt using FEM tool. The ferrite core model for analysis be used the EE10 type of TDK cop.. Transformer model objected flyback transformer type applied to flyback converter/inverter. Therefore, analysis results of loss were obtained from inner parameters of DC, AC resistance, leakage inductance, copper loss, core loss, and temperature etc.
A Direct Torque Control System for Reluctance Synchronous Motor Using Neural Network
Kim, Min-Huei ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 54, issue 1, 2005, Pages 20~29
This paper presents an implementation of efficiency optimization of reluctance synchronous motor (RSM) using a neural network (NN) with a direct torque control (DTC). The equipment circuit considered with iron losses in RSM is analyzed theoretically, and the optimal current ratio between torque current and exiting current component are derived analytically. For the RSM driver, torque dynamic can be maintained with DTC using TMS320F2812 DSP Controller even with controlling the flux level because a torque is directly proportional to the stator current unlike induction motor. In order to drive RSM at maximum efficiency and good dynamics response, the Backpropagation Neural Network is adapted. The experimental results are presented to validate the applicability of the proposed method. The developed control system show high efficiency and good dynamic response features with 1.0 [kW] RSM having 2.57 inductance ratio of d/q.
Drift Velocities for Electrons in
-Ar Mixtures Gas by MCS-Beq Algorithm
Kim, Sang-Nam ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 54, issue 1, 2005, Pages 29~33
Energy distribution function for electrons in
-Ar mixtures gas by MCS-BEq algorithm has been analysed over the E/N range
[Td] by a two term Boltana equation and by a Monte Carlo Simulation using a set of electron cross sections determined by other, authors, experimentally the electron swarm parameters for 0.2[%} and 0.5[%]
-Ar mixtures were measured by time-of-flight(TOF) method. The result show that the deduced electron drift velocities, the electron ionization or attachment coefficients, longitudinal and transverse diffusion coefficients and mean energy agree reasonably well with theoretical for a rang of E/N values. The results obtained from Booltemann equation method and Monte Carlo simulation have been compared with present and previously obtained data and respective set of electron collision cross sections of the molecules.
A Model Reduction and PID Controller Design Via Frequency Transfer Function Synthesis
Kim, Ju-Sik ; Kwang, Myung-Shin ; Kim, Jong-Gun ; Jeon, Byeong-Seok ; Jeong, Su-Hyun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 54, issue 1, 2005, Pages 34~40
This paper presents a frequency transfer function synthesis for simplifying a high-order model with time delay to a low-order model. A model reduction is based on minimizing the error function weighted by the numerator polynomial of reduced systems. The proposed method provides better low frequency fit and a computer aided algorithm. And in this paper, we present a design method of PID controller for achieving the desired specifications via the reduced model. The proposed method identifies the parameter vector of PID controller from a linear system that develops from rearranging the two dimensional input matrices and output vectors obtained from the frequency bounds.
Field Measurement and Analysis of Voltage Unbalance Factor
Jeong, Jong-Ho ; Park, Young-Jeen ; Lee, Eun-Woong ; Kim, Jong-Gyeum ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 54, issue 1, 2005, Pages 41~46
Most of LV customer have applied the 3-phase four wire system distribution system because it has advantage of supplying both of 1-phase & 3-phase loads simultaneously. Due to its structural simplicity, it is more convenient for use rather than the conventional separated scheme. But voltage unbalance more commonly emerges in individual customer loads due to phase load unbalance, especially where, single-phase power loads are used. Voltage unbalance factor(VUF) represents the loss of symmetry in the supply(magnitude and angle). It leads some problems such as de-rating or power losses. In this paper, voltage and current waveform in the actual fields have been measured and analyzed in relation with internationally allowable voltage unbalance limits.
Analysis on the Characteristics of Voltage Unbalance Factor by Load Variations
Kim, Jong-Gyeum ; Park, Young-Jeen ; Lee, Eun-Woong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 54, issue 1, 2005, Pages 47~53
Most of the loads in industrial power distribution systems are balanced and connected to three power systems. However, in the user power distribution systems, most of the loads are single & three phase and unbalanced, generating voltage unbalance. Voltage unbalance factor is mainly affected by load system rather than stable power system. Unbalanced voltage will draw a highly unbalanced current. As a result, the three-phase currents may differ considerably, thus resulting in an increased temperature rise in the machine. This paper presents a scheme on the characteristics of voltage and current unbalance factor under the load variation at the three phase 4-wire system. Load unbalance factor is measured by the power quality measurement apparatus and compared by the current unbalance factor. Two methods are indicated similar results. The voltage unbalance factor of the three-phase 4-wire system is approved by the field measurement. Each phase has an impedance each other by the unbalanced operation pattern and give rise to voltage unbalance.
A Study on the Implementation of Inheritance Anomaly in Concurrent Programming
Cho, Myung-Hyun ; Lee, Myung-Un ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 54, issue 1, 2005, Pages 53~57
When concurrency is integrated to programming language, problem more than inheritance remains yet. Because more than inheritance happens by collision or cross fire between synchronization and inheritance of same time object, when synchronization code is not detached properly from method code about same time object, it makes expanded of code to make derivation class change synchronization code of super class and method code. In this paper, minimize right of inheritance method, When subclass is introduced to new synchronization limitation condition, wish to solve problem more than inheritance of three types that happen in same time programming embodying C++ class that do so that can avoid alteration of method reed.