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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 11, Issue 6 - Dec 2006
Volume 11, Issue 5 - Oct 2006
Volume 11, Issue 4 - Aug 2006
Volume 11, Issue 3 - Jun 2006
Volume 11, Issue 2 - Apr 2006
Volume 11, Issue 1 - Feb 2006
Selecting the target year
Design of Variable Speed SRM Drive for Hydraulic Pump Application
Lee, Dong-Hee ; Kim, Bong-Chul ; An, Young-Joo ; Ahn, Jin-Woo ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 1~6
This paper proposes an SRM drive system to improve the drive efficiency of the hydraulic system. From the maximum hydraulic pressure and flow rate required by the hydraulic system, a proper SRM is designed and tested. The proposed SRM drive system controls oil pressure of the hydraulic system as well as motor speed. A 2.2[kW], 12/8-pole SR motor and digital controller based DSP are designed and tested for hydraulic pump system. The test results show that the system has some good features such as high efficiency and rapid response characteristics.
A Novel Method for Calculating the Stroke of LPMSM for Driving Linear Compressor Using High Pass Filter
Ahn, Jung-Ryol ; Lee, Hong-Hee ; Kim, Heung-Gun ; Nho, Eui-Cheol ; Chun, Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 7~13
Linear compressors with a free piston driven by a linear motor are widely attention in the cooling apparatus such as refrigerator due to the high efficiency The stroke of piston in the linear compressor driven by LPMSM (Linear Permanent-Magnet Synchronous Motor) can be obtained from Integrating the input voltage and current of LPMSM, but it may be diverged due to dc components in the voltage and current. The strategy to prevent the divergence of stroke using both the high-pass filter and do offset compensation was suggested. The equations for the magnitude and phase of the stroke and also dc offset including the stroke are derived as a function of the cut-off frequency of HPF. The accurate stroke of a piston can be calculated by compensating for dc offset. The performance of the newly developed stroke calculation scheme has been verified by experimentally on a linear compressor drive system, where the control was implemented by a 16-bit DSP.
Zero-Current Switching Two-Transformer Phase-Shifted Full-Bridge Converter using Voltage Ripple
Han, Sang-Kyoo ; Moon, Gun-Woo ; Youn, Myung-Joong ; Yoon, Hyun-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 14~21
This paper presents a Zero-Current Switching(ZCS) two-transformer phase-shifted full-bridge(TTFB) converter using voltage ripple. The proposed converter provides Zero-Voltage Switching(ZVS) of leading leg switches and ZCS of lagging leg switches using voltage ripple. Especially, circulating current is reduced by ZCS operation and there are no additional components required for the soft switching of power switches. Furthermore, in case of light load, ZVS operation of lagging leg can be achieved. The operations, analysis and design consideration of proposed converter are presented. To verify the validity of the proposed converter, experimental results for a 410W (205[V], 2[A]) prototype are presented.
The Loss Factor Analysis for PV System Optimization
Jung, Yeong-Seok ; Yu, Byung-Gyu ; Yu, Gwon-Jong ; Choi, Ju-Yeop ; So, Jung-Hun ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 22~28
Establishment of practicalization technologies is becoming more important as dissemination of domestic PV system has been increased. To improve performance through PV system optimization, this paper presents loss factors analysis of PV system based on results of field operational test. Also, as simulation results are compared with actual operational ones, the main loss factors of PV system due to performance degradation are reviewed.
High Performance Speed Control of IPMSM with LM-FNN Controller
Nam, Su-Myeong ; Choi, Jung-Sik ; Chung, Dong-Hwa ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 29~37
Precise control of interior permanent magnet synchronous motor(IPMSM) over wide speed range is an engineering challenge. This paper considers the design and implementation of novel technique of high performance speed control for IPMSM using learning mechanism-fuzzy neural network(LM-FNN) and ANN(artificial neural network) control. The hybrid combination of neural network and fuzzy control will produce a powerful representation flexibility md numerical processing capability. Also, this paper proposes speed control of IPMSM using LM-FNN and estimation of speed using artificial neural network controller. The back propagation neural network technique is used to provide a real time adaptive estimation of the motor speed. 'The error between the desired state variable and the actual one is back-propagated to adjust the rotor speed, so that the actual state variable will coincide with the desired one. The back propagation mechanism is easy to derive and the estimated speed tracks precisely the actual motor speed. Analysis results to verify the effectiveness of the new hybrid intelligent control proposed in this paper.
Precision Position Control of Induction Motors Using Disturbance Observer
Kim, Hyun-Sik ; Kang, Kyoung-Woo ; Ko, Jong-Sun ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 38~45
This paper presents load torque observer that is used to deadbeat control method in the induction motor(IM) precision position control system. The proposed algorithm shows robustness on induction servo motor system. All of the gain has been obtained on discrete domain analysis. The simulation has been obtained by the simulink. The results show that proposed system has good effectiveness for the disturbance of the induction servo motor system using DS1102 board.
Force Control of Hybrid Actuator Comprising DC Motor and MR Brake
Choy, Ick ; Kwon, Dong-Soo ; An, Jin-Ung ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 46~55
This paper presents the control method for the hybrid actuator comprising a DC motor and an MR brake. Generally, a DC motor as an active actuator has a small power to weight ratio and goes unstable with higher force control gain due to its saturation limit. In order to cope with this instability and make the transparency higher, this paper proposes a hybrid actuator which consists of a DC motor and an MR brake as a passive actuator and its force control method based on network theory. A DC motor actively produces the output corresponding to the signs of the input currents. On the other hand, an MR brake passively resists against the external load independent of the sign changes of the input currents. This characteristics is widely known as 'passive' This paper suggests a force control method based on passivity concept in network theory for the hybrid actuator and verified its performance and stability through the experiments.
Half-Bridge Series Resonant Converter Using A LLCT for High Density Switching Power Supply
Park, J.Y. ; Kong, Y.S. ; Hwang, I.G. ; Kim, E.S. ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 56~64
Recently, high density power supply has been researched over the last few years. To achieve high density power supply, the series resonant converter has been steadily used. In this paper, the half-bridge series resonant converter using the integrated Inductor-Inductor-Capacitor-Transformer(LLCT) is described. The structure of LLCT is analysed by the use of Finite Element Method Magnetics(FEMM) Software. Also the experimental results are verified by the simulation based on the theoretical analysis and the 300W experimental prototype.
Sensorless Drive of Brushless DC Motors Using an Unknown Input Observer
Ryu, Ji-Su ; Hyun, Dong-Seok ; Kim, Tae-Sung ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 65~71
In this paper, a novel motor control method is proposed to improve the performance of sensorless drive of BLDC motors. In the terminal voltage sensing method, which is a great portion of sensorless control, a precise rotor position cannot be obtained when excessive input is applied to the drive during synchronous operation mode. Especially in the transient state, the response characteristic decreases. To cope with this problem, the unknown input (back-EMF) is modelled as the additional state of system in this paper. Taking into account the disturbance adopted by the back-EMF, the observer can be obtained by the augmented system equation. An algorithm to detect the back-EMF of the BLDC motor using the state observer is constructed. As a result, the novel sensorless drive of BLDC motors that can strictly estimate rotor position and speed is proposed.
Indirect Current Control of Utility Interactive Inverter for Seamless Transfer
Yu, Tae-Sik ; Bae, Young-Sang ; Kim, Hyo-Sung ; Choi, Se-Wan ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 72~78
Distributed generation (DG) systems go to intentional islanding operation to back up private emergency loads when the main grid is out of electric power. Conventional utility interactive inverters normally operated in current control mode in DG system must change their operation mode into voltage control mode to ensure stable voltage source to the emergency loads when intentional islanding operation occurs. During the transfer between current control mode and voltage control mode, serious transient problem may occur on the output terminal voltage of the utility interactive inverter. This paper proposes reasonal inverter topology and its control algorithm for seamless transfer of DG systems in intentional islanding operation. Filter design guide line and data for a LCL filter that is appropriate for the proposed control algorithm are also presented by the authors.
Analysis of New Solar Cell Model for the Virtual Implemented Solar Cell System
Jeong, Byung-Hwan ; Kang, Byoung-Hee ; Lee, Myung-Un ; Choe, Gyu-Ha ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 79~89
Particularly the photovoltaic systems are preferred because the output is extracted to the useful electric energy. However, the output characteristics of photovoltaic(PV) systems using solar cell or array depend on the weather conditions. The assistant equipment which emulates the solar cell characteristics that can be controlled arbitrarily by researcher is required to the researchers for reliable experimental data. To solve these problems, it is necessary to research a solar cell model of which output characteristics varied by setting the weather conditions such as insolation levels and temperatures. Therefore, this paper was presented that improved model which is based on interpolation model. To verified the improved model, it is confirmed using the simulation of MATLAB. Also, the experiment was performed by the characteristics of virtual implemented solar cell(VISC) system with the proposed solar cell model. It could be confirmed that there exists actual ewer within 5% between actual solar cell and VISC system.
Microcontroller based Single-phase SRM Drive with High Power Factor
Ahn, Jin-Woo ; Lee, Zhen-Guo ;
The Transactions of the Korean Institute of Power Electronics, volume 11, issue 1, 2006, Pages 90~96
A novel high power factor drive of a single-phase switched reluctance motor (SRM) is researched. It achieves sinusoidal and near unity power factor input currents. The proposed SRM drive has one additional active switches. And a single-stage approach has a simple structure and low cost. A prototype to drive an SRM equipping a suitable encoder is designed to evaluate the proposed topology. The characteristics and validity of the proposed circuit is discussed with some simulations and experimental results.