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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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The Korean Institute of Power Electronics
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Volume & Issues
Volume 15, Issue 6 - Dec 2010
Volume 15, Issue 5 - Oct 2010
Volume 15, Issue 4 - Aug 2010
Volume 15, Issue 3 - Jun 2010
Volume 15, Issue 2 - Apr 2010
Volume 15, Issue 1 - Feb 2010
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A Fault Detecting Scheme for Short-Circuited Turn in a Permanent Magnet Synchronous Motor through a Current Harmonic Monitoring
Kim, Kyeong-Hwa ; Gu, Bon-Gwan ; Jung, In-Soung ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 3, 2010, Pages 167~178
DOI : 10.6113/TKPE.2010.15.3.167
To diagnose a stator winding fault caused by a short-circuited turn in a permanent magnet synchronous motor (PMSM), an on-line based fault detecting scheme during motor operation is presented. The proposed scheme is based on monitoring the second-order harmonic components in q-axis current obtained through the harmonic analysis and a winding fault is detected by comparing these components with those in normal conditions. The linear interpolation method is employed to determine harmonic data in arbitrary normal operating conditions. To verify the effectiveness of the proposed fault detecting scheme, a test motor to allow inter-turn short in the stator winding has been built. The entire control system including harmonic analysis algorithm and fault detecting algorithm is implemented using DSP TMS320F28335. The proposed scheme does not require any additional hardware and can effectively detect a fault during motor operation so long as the steady-state condition is satisfied.
Performance Improvement of an Anti-Islanding Algorithm using the Variation of Reactive Power with an Improved DFT Method
Kang, Duk-Hong ; Choi, Dae-Keun ; Lee, Kyo-Beum ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 3, 2010, Pages 179~187
DOI : 10.6113/TKPE.2010.15.3.179
This paper proposes a new anti-islanding method for single-phase grid-connected photovoltaic (PV) systems using Goertzel algorithm. The proposed scheme is based on inducing increases or decreases of frequencies of load voltage and current that is in the form of existences or periodical variations of the reactive power components. The frequency detection is needed to apply this power variation method to the grid-connected power converter. The proposed method is able to get a fast detection for anti-islanding without the effect of harmonics and noises. The simulation and experiment results validate the effectiveness of the proposed method.
Bidirectional Charging/Discharging Digital Control System for Eco-friendly Capacitor Energy Storage Device Implemented by TMS320F28335 chip
Lee, Jung-Im ; Lee, Jong-Hyun ; Jung, An-Yoel ; Lee, Choon-Ho ; Park, Joung-Hu ; Jeon, Hee-Jong ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 3, 2010, Pages 188~198
DOI : 10.6113/TKPE.2010.15.3.188
Recently, as the demand of the environmental-friendly energy storage system such as an electric double-layer condenser increases, that of the bidirectional charger/discharger for the systems also increases. However, when charging/discharging mode-change occurs, the charger/discharger employing a bi-directional DC-DC converter with a commercialized analog controller has a complex circuit scheme, and a poor transient response. On the other hand, if a single digital controller is used for the bi-directional mode, the system performances can be improved by application of an advanced power-processing algorithm. In the paper, an environmental-friendly power storage systems including an Electric Double Layer Capacitor(EDLC) banks were developed with a bi-directional buck-boost converter and a digital signal processor (TMS320F28335). A simulation test-bed was realized and tested by MATLAB Simulink, and the hardware experiment was performed which shows that the dynamic response was improved such as the simulation results.
Improving the Output Current of Matrix Converter under Abnormal Input Voltage Conditions using a Neural Network Compensator
Lee, Eun-Sil ; Park, Ki-Woo ; Lee, Kyo-Beum ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 3, 2010, Pages 199~206
DOI : 10.6113/TKPE.2010.15.3.199
Matrix converter is an energy conversion device of controlled power semiconductor switches that directly connects the three-phase source to the three-phase load. With no dc-link components for energy storage in the matrix converter the input current depends directly upon the load currents and the switch state of the converter. Therefore the unbalanced and distorted input voltages can result in unwanted output harmonic currents. This paper presents a current compensator based on neural network to improving output current quality for matrix converter under abnormal input voltage conditions. The effectiveness and feasibility of the proposed technique has been proven through numerical simulations and experimental tests.
DC Characteristics Analysis of Various AC loads for Hybrid Distribution
Lee, Young-Jin ; Han, Dong-Ha ; Choi, Jung-Muk ; Jeong, Byong-Hwan ; Kim, Dong-Jin ; Choe, Gyu-Ha ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 3, 2010, Pages 207~217
DOI : 10.6113/TKPE.2010.15.3.207
Recently, the use of DC power increased due to the increased use of digital load. Power factor of input current decrease and input current harmonics increase, and conversion loss which is occurred in the AC / DC converter is a problem to provide the proper DC voltage to the device equipped with an internal AC / DC converter. Hybrid system supplies the AC power and DC power to AC load (motor load and the transformer load) and DC loads (computers, TV, LED fluorescent light) at the same time it supplies the renewable energy and utility energy taken power from Utility to user for improving the efficiency and renewable energy improvements in ease of use. This paper studies DC characteristics of traditional AC load for Hybrid distributions.
Minimization of Welding Time for an AC Resistance Spot Welding System With 60Hz Transformer
Seok, Jin-Kyu ; Kang, Sung-Kwan ; Song, Woong-Hyub ; Nho, Eui-Cheol ; Kim, In-Dong ; Kim, Heung-Geun ; Chun, Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 3, 2010, Pages 218~225
DOI : 10.6113/TKPE.2010.15.3.218
This paper deals with a method to minimize the welding time for an AC spot welding system. The spot welding system using a conventional SCR type circuit has a disadvantage of slow control speed and no precise current control. Therefore, recently, the using of inverter type welding system is increasing. Conventional welding machine adopts several tens of switching devices connected in parallel to obtain a huge current of several thousands ampere with a short welding time. This paper analyzed a welding system consisting with 4 IGBT switches for a full-bridge inverter and conventional 60 [Hz] transformer. The simulation and experimental results show the validity of the proposed method.
An Improved Feed-Forward Controller for the Parallel Operation of a Single-Phase PWM Converter in High-Speed Trains
Park, Byoung-Gun ; Hyun, Dong-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 3, 2010, Pages 226~234
DOI : 10.6113/TKPE.2010.15.3.226
This paper proposes an improved feed-forward controller that calculates the gain value by estimating the changed boost inductance in practical operating condition of transformer. The boost inductance is estimated by the measurement of input current and voltage. The estimated boost inductance is optimized by the least square method. The proposed feed-forward controller can be achieved the robust control through the gain value calculating the estimated boost inductance despite of the changed condition of transformer and can minimize the interference phenomenon by reducing the harmonics of input current. The validity of proposed technique is verified through the simulation and experiment.
LCL Filter Design for Grid-connected PCS Using Total Harmonic Distortion and Ripple Attenuation Factor
Park, Jong-Hyoung ; Chi, Min-Hun ; Kim, Heung-Geun ; Chun, Tae-Won ; Nho, Eui-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 3, 2010, Pages 235~243
DOI : 10.6113/TKPE.2010.15.3.235
This paper describes a design method of LCL filter for grid-connected three-phase PWM inverter. First, by analyzing the ripple component of phase voltages and currents according to the PWM pattern of grid-connected three-phase inverter, the RMS value of the current ripple can be calculated. Then based on the analysis, the current THD in the inverter-side can be defined. After that by analyzing the dependency between the current THD of the system and the current ripple attenuation, the parameter of LCL filter can be designed. Finally, the described LCL filter design method is verified by showing a good agreement between the target current
and the actual one through the simulation and experiment.
A Study on Parallel Operation of PWM Inverters for High Speed and High Power Motor Drive System
Cho, Un-Kwan ; Yim, Jung-Sik ; Sul, Seung-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 3, 2010, Pages 244~251
DOI : 10.6113/TKPE.2010.15.3.244
High speed motors have been widely used in industries to reduce system size and improve power conversion efficiency. However, the high speed motors sometimes suffer from core losses caused by PWM current ripple; noting that the phase inductance,
, of high speed motor is smaller than that of ordinary motors. In the proposed topology, three PWM inverters are connected in parallel through nine coupled inductors. Compared to the PWM current ripple of the conventional single inverter system, that of the proposed scheme can be conspicuously reduced without the voltage drop at the inductors. In this paper a theoretical analysis of the output voltage of the proposed topology is presented, and then the validity of the proposed method is verified by experimental results.
A Method to Adjust the Optimal Phase Angle of Resolver Excitation Signal
Kim, Kyung-Seo ;
The Transactions of the Korean Institute of Power Electronics, volume 15, issue 3, 2010, Pages 252~258
DOI : 10.6113/TKPE.2010.15.3.252
If the speed measurement of resolver and the generation of PWM signals are implemented with single microcontroller, it is easy to reduce the system cost and to avoid the switching noise of inverters. To avoid the switching noise and to improve the accuracy of measurement, PWM switching and A/D sampling of the resolver should be synchronized. Phase angle of the resolver excitation signal is increased in stepwise manner, then, the output signal of the resolver is measured in each step. From the measured data, the optimal phase angle of resolver excitation signal is estimated using the least square approximation method.