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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Power Electronics
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Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 1, Issue 2 - Oct 2001
Volume 1, Issue 1 - Apr 2001
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Initial Pole Position Estimation of Surface PM-LSM
Kim, Tae-Woong ; Junichi Watanabe ; Sumitoshi Sonoda ; Junji Hirai ;
Journal of Power Electronics, volume 1, issue 1, 2001, Pages 1~8
The elimination of a pole sensor is desirable due to the low-cost requirement, the compactness, and the applied drives. This paper proposes the algorithm for the initial pole-position estimation of a surface permanent magnet linear synchronous motor (PM-LSM), which is carried out under the closed loop control without a pole sensor and is insensitive to the motor parameters. This algorithm is based on the principle that the initial pole position (IPP) is estimated by the trigonometric function of the two reference currents. The effectiveness of the proposed algorithm is confirmed by testing a surface PM-LSM with large disturbance, which result shows that IPP is well estimated within a satisfied moving-distance and a shorter estimation taken-time even if large disturbance such as cogging and friction is existed.
Performance Analysis of a Three-Phase Parallel Active Power Filter which Compensates PCC Voltage and the Unbalanced Loads
Lee, Woo-Cheol ; Lee, Taeck-Kie ; Hyun, Dong-Seok ;
Journal of Power Electronics, volume 1, issue 1, 2001, Pages 9~18
The performance analysis of a three-phase parallel active power filter that compensates PCC voltage and the unbalanced loads is presented in this paper. The proposed scheme in this paper employs a PWM voltage-source inverter and has two operation modes. Firstly, it operates as a conventional active filter with reactive power compensation when PCC voltage is within the 15% voltage drop range. Secondly, it operates as a voltage compensator when PCC voltage is not within the 15% voltage drop range. And both APF and voltage compensator compensate asymmetries caused by nonlinear loads. Finally, two methods of detecting the negative sequence are reviewed, and the validity of this scheme is investigated through analysis of simulation and experimental results for a prototype active power filter system rate at 10KVA.
DESIGN OF A HIGH-SPEED HIGH-POWER SWITCHED RELUCTANCE MOTOR
Jacket F. Gieras ; Park, Jaeho ;
Journal of Power Electronics, volume 1, issue 1, 2001, Pages 19~25
A high speed, three phase, 12/8 pole, 225 kW switched reluctance motor (SRM) has been designed and analyzed. A circuital approach has been used to find the geometry, windings parameters and electromagnetic loading. Then, the 3D finite element method (FEM) has been used to calculate the static torque more accurately and optimize the design. The efficiency of the designed SRM is almost constant over wide range of speed and its phase current is less sensitive to the speed than that of an induction motor of the same rating. Recommendations for manufacturers and users are given.
Carrier based SVPWM Method for Multi-Level System Considering Harmonic Distortion Factor
Lee, Yo-Han ; Kim, Dong-Hyun ; Hyun, Dong-Seok ;
Journal of Power Electronics, volume 1, issue 1, 2001, Pages 26~35
In most inverter/converter applications SVPWM method is a preferred approach since it shows good characteristics in linear modulation range and waveform quality. In this paper, we propose a new carrier based SVPWM method for multi-level system, First, we survey the conventional carrier based SVPWM method, and investigate the problem of the conventional one for the multi-level system with the focus on the switching frequency harmonic flux trajectories. Finally, we propose a new carrier based SVPWM method that can reduce harmonic distortion. Simulation and experimental results are given for verification of the proposed SVPWM method.
An Improved Carrier-based SVPWM Method By the Redistribution of Carrier-wave Using Leg Voltage Redundancies in Generalized Cascaded Multilevel Inverter
Kang, Dae-Wook ; Lee, Yo-Han ; Suh, Bum-Seok ; Park, Chang-Ho ; Hyun, Dong-Seok ;
Journal of Power Electronics, volume 1, issue 1, 2001, Pages 36~47
The carrier-based space vector pulse width modulation(SVPWM), which is considered as highly simple and efficient PWM technology, can be also used in multilevel inverters. The method was originally designed for the two-level inverter and developed to the diode clamped multilevel inverter structure. however it may be noted that it also cause bad switch utilization in cascaded multilevel inverter. This paper introduces an improved carrier-based SVPWM scheme, which is fully suitable for cascaded multilevel inverter topologies because it can achieve the optimized switch utilization through the redistribution of the triangular carrier waves considering leg voltage redundancies while having the advantages of the conventional carrier-based SVPWM. Using simulation and experimental results, the superior performance of new PWM method is shown.
Performance Analysis of SSSC with Switching-level Simulation Model and Scaled Hardware Model
Han, Byung-Moon ; Kim, Hee-Joong ; Baek, Seung-Taek ;
Journal of Power Electronics, volume 1, issue 1, 2001, Pages 48~55
This paper describes a switching-level simulation model and scaled hardware model for SSSC, which is useful for analyzing the dynamic interaction between the SSC and the power transmission system. A detailed simulation model with EMTP was developed to verity the SSSC operation with control system, and its increasing capability of power transmission through the line for a typical one-machine infinite-bus system. The simulation results of the developed model are compared with the experimental results froma scaled model fo 2KVA rating for evaluation the whole system operation.
A Study on Voltage and Switching Angle for Maximum Torque/Efficiency and Minimum Torque Ripple of SRM by using SIMULINK
Cha, Hyun-Rok ; Seo, Jong-Yun ; Yang, Hyong-yeol ; Kim, Kwang-Heon ; Lim, Young-Cheol ; Jang, Do-Hyun ;
Journal of Power Electronics, volume 1, issue 1, 2001, Pages 56~64
This paper presents the switching angle and voltage for maximizing the torque or efficiency and minimizing torque ripple of an 8/6, SRM. The approximate analysis and computer simulation determine the switching angle and voltage by using SIMULINK
. This is performed as a function of the speed and torque required by the load. From the results, new three facts can be known: First, the maximum torque depends on voltage and speed depends on switching angle. The others, the maximum efficiency and minimum torque ripple relay on switching angle. We control the switching angle and voltage of and asymmetrical inverter for the SRM with one-chip micro controller.