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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 17, Issue 6 - Dec 2012
Volume 17, Issue 5 - Oct 2012
Volume 17, Issue 4 - Aug 2012
Volume 17, Issue 3 - Jun 2012
Volume 17, Issue 2 - Apr 2012
Volume 17, Issue 1 - Feb 2012
Selecting the target year
Development of PV Module Integrated Type Low Voltage Battery Charger using Cascaded Buck-Boost Converter
Kim, Dong-Hee ; Lee, Hee-Seo ; Lee, Young-Dal ; Lee, Eun-Ju ; Lee, Tae-Won ; Lee, Byoung-Kuk ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 471~477
DOI : 10.6113/TKPE.2012.17.6.471
In this paper, in order to use module integrated converter using cascaded buck-boost converter for a low battery charger in stand-alone system, a charging algorithm which considers photovoltaic and battery status and PWM controllers which are changed according to charging modes are proposed. The proposed algorithm consists of constant current mode, constant voltage mode and maximum power point tracking mode which enables the battery to charge with maximum power rate. This paper also presents design of cascaded buck-boost converter that is the photovoltaic charger system. A 150W prototype system is built according to verify proposed the charger system and the algorithm.
PWM Method with Low d-axis Current Ripple for reducing Input Current THD at Light Loads in Three Phase PWM Rectifier
Jin, Yong-Sin ; Shin, Hee-Keun ; Kim, Hag-Wone ; Cho, Kwan-Yuhl ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 478~485
DOI : 10.6113/TKPE.2012.17.6.478
In this paper, a new PWM method is proposed to reduce the input current harmonics of 3 phase PWM rectifier. In the conventional carrier comparison PWM method, a triangular wave is generally used as the carrier wave. However, the large d-axis current ripple by the triangle carrier wave may be a source of large input current THD(Total Harmonic Distortion). In this paper, a new carrier comparison PWM method with saw tooth wave is proposed. Depending on the sector where the voltage command vector places, one of the rising or falling saw tooth wave is selected. To reduce the switching losses of the saw tooth carrier PWM, the discontinuous PWM is also presented. The proposed PWM method can reduce the d-axis current ripple as well as the switching losses. The performance of the conventional and proposed PWM methods is verified by the simulation and experimental results.
Three Phase Embedded Z-Source Inverter
Oh, Seung-Yeol ; Kim, Se-Jin ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 486~494
DOI : 10.6113/TKPE.2012.17.6.486
In this paper, we proposes the three-phase embedded Z-source inverter consisting of the three embedded Z-source converters and it's the output voltage control method. Each embedded Z-source converter can produce the bipolar output capacitor voltages according to duty ratio D such as single-phase PWM inverter. The output AC voltage of the proposed system is obtained as the difference in the output capacitor voltages of each converter, and the L-C output filter is not required. Because the output AC voltage can be stepped up and down, the boost DC converter in the conventional two-stage inverter is unnecessary. To confirm the validity of the proposed system, PSIM simulation and a DSP based experiment were performed under the condition of the input DC voltage 38V, load
, and switching frequency 30kHz. Each converter is connected by Y-connection for three-phase loads. In case that the output phase voltage is the same
as the input DC voltage and is the 1.5 times(
), the simulation and experimental results ; capacitor voltages, output phase voltages, output line voltages, inductor currents, and switch voltages were verified and discussed.
Experiment on DC Circuit Breaker for Inductive Load by Improved Magnetic Arc-extinguisher and Arc-Attenuation Circuit
Lee, Sung-Min ; Kim, Hyo-Sung ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 495~499
DOI : 10.6113/TKPE.2012.17.6.495
Recently, DC distribution systems become hot issues since DC type loads increase rapidly according to the expansion of IT equipment such as computers, servers, and digital devices; DC type loads will cover 50% for all electricity loads in 2020 which was mere 10% in 2000. DC distribution systems are also accelerated by the expansion of renewable power systems since they are easy to be interfaced with DC grids rather than AC grids. However, removing the fault current in DC grids is comparably difficult since the current in DC grids has non zero-crossing point like in AC grids. Thus, developing dedicated DC circuit breakers for DC grids is necessary to get safety for human and electrical facilities. Magnet arc extinguishing method is proper to small size DC circuit breakers. However, simple Magnet arc extinguishing method is not enough to break inductive fault currents. This paper proposed a novel DC circuit breaker against inductive fault current defined by IEEE C37.14-2004 Standard for Low-Voltage DC Power Circuit Breakers Used in Enclosures. The performance of the proposed DC circuit breaker was verified by an experimental circuit breaker test system built in this research.
Clamp-mode Three-level High Voltage Gain Boost Converter using Coupled Inductor
Kim, Su-Han ; Cha, Hon-Nyong ; Kim, Heung-Geun ; Choi, Byung-Cho ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 500~506
DOI : 10.6113/TKPE.2012.17.6.500
In this paper, a non-isolated high step-up and high efficiency boost converter is proposed. By using the 3-level boost converter structure, the proposed converter can obtain higher voltage gain than conventional high step-up converters. The voltage spike of the switching device is well clamped by using the clamp circuit composed of a clamp diode and a capacitor and the energy of the leakage inductor of coupled inductor is effectively transferred to output. Due to the 3-level structure, the equivalent switching frequency of the coupled inductor is doubled, which results in reduced inductor size. A 500 W prototype converter is built and tested to verify performance of the proposed converter.
Two Stage High Step-Up Converter for Low Input Voltage and High Current Applications
Noh, Young-Jae ; Xu, Han ; Kang, Cheol-Ha ; Kim, Eun-Soo ; Jang, Sang-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 507~515
DOI : 10.6113/TKPE.2012.17.6.507
DC-DC converter which composed of LLC resonant converter, operated by fixed switching frequency with fixed duty cycle (50%), and flyback converter to provide constant output voltage(
) with variation of input voltage(
) is proposed in this paper. To obtain constant output voltage(
), flyback converter is not operated in case of above the maximum input voltage(
) and operated as the input voltage decreases to below 60VDC. Therefore, flyback converter can be designed to the 50% power rating of the maximum power in the proposed DC-DC converter. Operation modes and voltage gain characteristics were analyzed and a 360W prototype converter was tested to verify the proposed converter.
Development of Multi-refrigerator Energy-saving Power Converter and the Combined Control System
Lee, Sang-Taek ; Kim, Hee-Jun ; Kim, Dae-Kyong ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 516~522
DOI : 10.6113/TKPE.2012.17.6.516
Recently trends of home appliance has been changed in house and the demand for functional refrigerator has been increased. Power consumption of refrigerator accounts for a large proportion in consumer electronics. Also, compressor accounts for most of the power consumption in refrigerator parts. Therefore, this paper proposes a multi-refrigerator system with single compressor & condenser fan in order to reduce energy. To verify the availability of the proposed multi refrigerant system, integration experiment is carried out.
High Efficiency Power Conversion System for Battery-Ultracapacitor Hybrid Energy Storages
Yoo, Ju-Seung ; Choi, Woo-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 523~531
DOI : 10.6113/TKPE.2012.17.6.523
This paper proposes a high efficiency power conversion system for battery-ultracapacitor hybrid energy storages. The proposed system has only one bidirectional dc-dc converter for hybrid power source with batteries and ultracapacitors. The hybrid power source has bidirectional switching circuits for selecting one energy storage device. Bidirectional power flow between the energy storage device and high voltage capacitor can be controlled by one bidirectional converter. An asymmetrical switching method is applied to the bidirectional converter for high power efficiency. Switching power losses are reduced by zero-voltage switching of power switches. System operation and design considerations are presented. The experimental results are provided to verify the performance of the proposed system.
A Study on the Mathematical Modeling Techniques for HEV High-power Lithium-Polymer Battery
Seo, Dong-Woo ; Koo, Ja-Kyeong ; Kim, Il-Song ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 532~538
DOI : 10.6113/TKPE.2012.17.6.532
This paper proposes the Mathematical Modeling for HEV High-power Lithium-Polymer Battery. The nonlinear system of the Lithium Battery electrical characteristic express mathematical state equation. We also test charge/discharge and temperature experimental used to identify parameters of the cell find parameter of the least error. The proposed model experimental results is used with battery cycler to verify of the proposed model.
Bi-directional Photovoltaic Inverter with High Efficiency and Low Noise
Lee, Sung-Ho ; Kwon, Jung-Min ; Kwon, Bong-Hwan ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 539~545
DOI : 10.6113/TKPE.2012.17.6.539
Due to merits cost and efficiency, the transformer-less type photovoltaic (PV) inverters have been popularized in the solar market. However, the leakage current flowing through a parasitic capacitor between PV array and ground can cause adverse effect in the transformer-less PV system. In this paper, a bi-directional PV inverter with high efficiency and low noise is proposed for the PV system with an energy storage device. The proposed inverter is a transformer-less type and performs the bi-directional power control between dc sources and grid with high efficiency. In addition, the proposed inverter can suppress the leakage current and obtain low noise characteristic. Finally, 3-kW prototype was implemented to confirm validity of the proposed inverter.
Anti-islanding Detection of Photovoltaic Inverter Based on Negative Sequence Voltage Injection to Grid
Kim, Byeong-Heon ; Park, Yong-Soon ; Sul, Seung-Ki ; Kim, Woo-Chull ; Lee, Hyun-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 546~552
DOI : 10.6113/TKPE.2012.17.6.546
This paper presents an active anti-islanding detection method using negative sequence voltage injection to the grid through a three-phase photovoltaic inverters. Because islanding operation mode can cause a variety of problems, the islanding detection of grid-connected photovoltaic inverter is the mandatory feature. The islanding mode is detected by measuring the magnitude of negative sequence impedance calculated by the negative sequence voltage and current at the point of common coupling. Simulation and experimental test are performed to verify the effectiveness of the proposed method which can detect the islanding mode in the specified time. The test has been done in accordance with the condition on IEEE Std 929-2000.
Design and Implementation of 150W Portable Fuel Cell Power Pack
Woo, Dong-Gyun ; Joo, Dong-Myoung ; Kim, Yun-Sung ; Oh, Jae-Gi ; Lee, Byoung-Kuk ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 6, 2012, Pages 553~561
DOI : 10.6113/TKPE.2012.17.6.553
Existing energy sources convert chemical energy into mechanical energy, while fuel cell directly generates electricity through an electrochemical reaction between hydrogen and oxygen. Therefore, it has a lot of strong points such as high efficiency, zero emission, and etc. In addition, with the development of hydrogen preservation technique, some companies have been researching and releasing portable fuel cell power packs for specific applications like military equipment, automobile, and so on. However, there are some drawbacks to the fuel cell, high cost and slow dynamic response. In order to compensate these weak points, auxiliary energy storages could be applied to the fuel cell system. In this paper, the optimum structure for a 150W portable fuel cell power pack with a battery pack is selected considering the specification of the system, and the design process of main parts is described in detail. Here, main objectives are compact size, simple control, high efficiency, and low cost. Then, an automatic mode change algorithm, which converts the operating mode depending on the states of fuel cell stack, battery pack, and load, is introduced. Finally, performance of the designed prototype using the automatic mode change control is verified through experiments.