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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 12, Issue 6 - Dec 2007
Volume 12, Issue 5 - Oct 2007
Volume 12, Issue 4 - Aug 2007
Volume 12, Issue 3 - Jun 2007
Volume 12, Issue 2 - Apr 2007
Volume 12, Issue 1 - Feb 2007
Selecting the target year
A Novel Fault Detection Scheme for Voltage Fed PWM Inverter
Yu, Ok-Sun ; Park, Nam-Ju ; Hyun, Dong-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 1~8
This paper presents a new fault detection scheme for voltage fed inverter to improve the reliability of power electronic system, which is of paramount importance in the wide industrial applications. The proposed method is achieved by using voltage across lower switches in each phase under the switch fault condition. The reconfiguration method is achieved by the four-switch topology connecting a faulty leg to the middle point of DC-link using bidirectional switches. The proposed method has a simple algorithm and fast fault detection time. Therefore, normal operation of the system after faults is continuously achieved by reconfiguration of system topology. The superior performance of the proposed fault detection and tolerance method are proved by simulation.
An Analysis of Position Detection Error of Sensorless Controller and Modeling of Drive System for Interior Permanent Magnet BLDC Motors
Lee, Dong-Myung ; Kim, Hag-Wone ; Cho, Kwan-Youl ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 9~18
This paper proposes the modeling of sensorless drive system using 120 degree conduction method for IPM (Interior Permanent Magnet) BLDC motors and analyzes characteristics of the terminal voltage that is used to detect the rotor position. This paper shows that the ZCP (Zero-Crossing Point) of the measured terminal voltage used In sensorless control is ahead of that of the back EMF of IPM motors because they have a saliency. This research also analyzes that the amount of position detection error is related to saliency, rotor speed, and load condition. In addition, this paper shows that motors have bigger advance angles than we have expected because the ZCP of terminal voltage precedes the actual ZCP, and under operation conditions such as heavy load and high speed it may generate abnormal currents that flow toward opposite direction after phase current becomes zero.
Precision position control of induction motors using DSP6416
Kim, Hyun-Sik ; Kim, Young-Chan ; Ko, Jong-Sun ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 19~26
This paper presents a precision position control of induction motor using disturbance observer to reduce disturbance effects. It shows that proposed algorithm is strong in induction motor precision control for disturbance change. This system with disturbance observer using deadbeat control, which has high benefit, is good for quick disturbance compensation. To show this effectiveness the whole process is simulated by simulink, and also experimented by DSP6416 with TCP-IP network board.
Current Control of Three-Phase PWM Converters under Unbalanced and Distorted Source Voltage
Jang, Jeong-Ik ; Kim, Heung-Geun ; Lee, Dong-Choon ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 27~36
This paper proposes a current control scheme of the PWM converters under nonideal source voltage conditions such as unbalance and distortion. For the distorted source voltage, the harmonic current controllers are introduced to the conventional current controller. These control loops can eliminate the 5th and 7th order harmonics which are hardly to be done by using filters. For the unbalanced source voltage, a negative sequence current controller is introduced either to reduce the DC-link voltage ripples or to eliminate the source current unbalance. Experimental results show the validity of the proposed control scheme.
An Analysis and Design of RPV and AFD Method for Anti-Islanding of Single-Phase UIPV System under The Test Condition Recommended by IEEE 929-2000
Kim, Hong-Sung ; Kim, Han-Goo ; Choe, Gyu-Ha ; Kim, Jae-Chul ; Choi, Yung-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 37~49
To detect islanding mode when the grid is being tripped is a major safety issue in utility interactive PV(UIPV) system. Widely used techniques among various active methods to detect islanding mode are Reactive power variation (RPV)method and Active frequency drift(AFD) method. In this paper, analytical design method is suggested for AFD and RPV method under IEEE recommended islanding test condition. And in order to show the validity of proposed method, EMTP based simulation was done for UIPV system with RPV method and AFD method. Results shows proposed method is very useful.
A study on the efficiency characteristics for two transistor Forward DC-DC converter
Ahn, Tae-Young ; Lee, Gwang-Taek ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 50~55
In this paper, we present an analytical method that provides fast and efficient evaluation of the conversion efficiency for Two transistor forward (TTF) DC-DC converter In the proposed method, the conduction losses are evaluated by calculating the effective values of the ideal current waveform first and incorporating them into an exact equivalent circuit model of the TTF converter that includes all the parasitic resistances of the circuit components. While the conduction losses are accurately accounted for the diode rectification, the core losses are assumed to be negligible in order to simplify the analysis. The validity and accuracy of the proposed method are verified with experiments on a prototype TTF converter An excellent correlation between the experiments and theories are obtained for the input voltages of 390V, output voltage 12V and maximum power 480W.
A Novel SLLC Series Resonant Converter for The Boost DC/DC Converter
Kim, Eun-Soo ; Kang, Sung-In ; Chung, Bong-Geun ; Cha, In-Su ; Yoon, Jeong-Phil ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 56~64
Recently, the high frequency link boost DC/DC converter has been used widely for PCS (Power Conditioning System) because of the requirements of small size and low cost. However, the high frequency link boost DC/DC converters applied the conventional voltage-fed converter and current-fed converter have some problems like high conduction losses and high surge voltage due to high circulating current and leakage inductance, respectively. To improve these problems, a novel secondary LLC (called SLLC) series resonant converter is proposed in this paper and its theoretical analysis, its operating waveforms, simulation and experimental results for a boost DC/DC converter using SLLC series resonant topology verifies the proposed topology. 800W experimental prototype is tested.
Correction on Current Measurement Errors for Accurate Flux Estimation of AC Drives at Low Stator Frequency
Cho, Kyung-Rae ; Seok, Jul-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 65~73
This paper presents an on-line correction method of current measurement errors for a pure-integration-based flux estimation down to 1-Hz stator frequency. An observer-based approach is taken as one possible solution of eliminating the dc offset and the negative sequence component of unbalanced gains in the synchronous coordinate. At the same time, the positive sequence component estimation is performed by creating an error signal between a motor model reference and an estimated q-axis rotor flux established by a permanent magnet (PM) in the synchronous coordinate. The compensator utilizes a PI controller that controls the error signal to zero. The proposed technique further contains a residual error compensator to completely eliminate miscellaneous disturbances in the estimated flux. The developed algorithm has been implemented on a 1.1-kW permanent magnet synchronous motor (PMSM) drive to confirm the effectiveness of the proposed scheme.
Fault Detection and Compensation Scheme of Switch Open-fault in VSI for Two-phase Excitation Drive
Lee, Kui-Jun ; Park, Nam-Ju ; Hyun, Dong-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 74~80
This paper proposes the novel open-fault detection/isolation scheme of inverter switch in two-phase excited VSI. This scheme identify open-fault using voltage sensor at lower switches of each phase according to the operating mode. It has benefit of simple implementation, fast detection and robustness in the load so that stab of the system is improved. Also, at faulty mode, it minimizes faulty effect and makes possible continuous operation through the reconfiguration procedure applying four-switch operation. The validity of proposed fault detection scheme is verified by experimental results.
Single-Phase Utility-Interactive Inverter for Residential Fuel Cell Generation System
Jung, Sang-Min ; Bae, Young-Sang ; Yu, Tae-Sik ; Kim, Hyo-Sung ; Choi, Se-Wan ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 81~88
In this paper, a new single-phase utility-interactive inverter system for residential power generation with fuel cell is proposed. The proposed inverter system is not only capable of working in both stand-alone and grid-connected mode, but also ensures smooth and automatic transfer between the two modes of operation. The proposed control method has little steady-state error and good transient response characteristic. Also, the control method can be implemented using low-cost, fixed point DSP since it has simpler structure, smaller amount of calculation, and smaller number of sensors. The controller for the proposed utility-interactive inverter system is described, and the validity is verified through simulation and experiment.
Performance Analysis of load simulator interconnected with Power Quality Compensator
Bae, Byung-Yeol ; Cho, Yun-Ho ; Park, Yong-Hee ; Han, Byung-Moon ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 89~97
This paper describes a load simulator with power recovery capability, which is based on the voltage source converter-inverter set. The load simulator can save the electric energy that should be consumed to test the operation and performance of the power quality compensator and the power equipment. The load simulator consists of a converter-inverter set with a DSP controller for system control and PWM pulse generation. The converter operates as a universal load to model the linear load and the non-linear load, while the inverter feed the energy back to the power source with harmonic compensation. the performance of proposed load simulator was analyzed with scaled-model experiment, interconnected with the active power filter. The experimental results confirms that the proposed load simulator can be utilized to test the performance of active power filter.
Online Turn-Off Angle Contro1 for Performance Optimization of the Switched Reluctance Motor
Jeong, Byeong-Ho ; Choi, Youn-Ok ; Lee, Kang-Yeon ; Cho, Geum-Bae ; Chung, Soo-Bok ;
The Transactions of the Korean Institute of Power Electronics, volume 12, issue 1, 2007, Pages 98~106
This paper represent improved on-line turn off angle control schemes for switched reluctance motors based on current control. For the purpose of finding the optimal commutation switching angle point with improved controller, it is utilized turn on and turn off position calculation with inductance vs. current vs. not linkage analysis method. The goal of proposed paper is the maximization of the energy conversion per stroke and torque ripple reduction and obtaining approximately flat-topped current waveform. The proposed control scheme is demonstrated simulation and on a prototype experimental system.