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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
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Comparison of Current Control Method for Single-phase PFC converter with 1-switch Voltage Doubler Strategy
Ku, Dae-Kwan ; Ji, Jun-Keun ; Cha, Guee-Soo ; Lim, Seung-Beom ; Hong, Soon-Chan ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 1~7
DOI : 10.6113/TKPE.2012.17.1.1
This paper describes the performance comparison results for current controller of a single-phase PFC converter with 1-switch voltage doubler strategy for single-phase double-conversion UPS(Uninterruptible Power Supply). A single-phase PFC converter with 1-switch voltage doubler strategy needs a diode bridge and one bidirectional active switch. Thus it is possible to reduce the material cost. However, the study results of current controller design and comparison of current control method has not been known after the converter circuit was proposed. For the performance comparison of current control, single-phase 3 kVA double-conversion UPS was tested. The performance of PI and PR current controller is experimentally confirmed with followings - input current reference tracking, input power factor correction and input current THD suppression.
DC-Link Voltage Control of Distribution Static Compensator using Ripple Voltage Extraction
Kim, Ho-Yeol ; Choi, Jong-Woo ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 8~13
DOI : 10.6113/TKPE.2012.17.1.8
DSTATCOM is active filter that reduces nonlinear and unbalanced currents. Researches about DSTATCOM are mainly divided two parts, one is the reference value calculation of compensation current depending on the calculation of the load-side average active power and dc-link capacitor average voltage, the other part is actual current control depending on the reference value of compensation current. This paper proposes a calculation of dc-link capacitor average voltage ripple voltage extraction instead of conventional method using LPF. The utility of the proposed algorithm is verified through the theoretical analysis and the experiment under unbalance loads and non-linear load.
A Study on the Design and Selection of Switch and Diode by Analyzing Current Ringing on DCM Bi-directional Buck Converter
Lee, Young-Dal ; Choe, Gyu-Yeong ; Shin, Seung-Min ; Lee, Byoung-Kuk ; Lee, Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 14~20
DOI : 10.6113/TKPE.2012.17.1.14
This paper presents a design and topology selection of bi-direcional buck converter based on PV PCS for managing the electric power. Futhermore, Current Ringing on DCM bi-directional buck converter for soft switching is analyzed in detail. PSIM Simulation and Experiments at the various operating points show the propriety of this paper. Building on the result of simulation and experiment, a comparative analysis is performed with the approximate estimate. By use of a study, the selecion of switch and diode which improve efficiency of the overall system is appiled to DCM bi-directional buck converter based on PV PCS.
Development of DC Circuit Breaker using Magnet Arc Extinguisher
Lee, Sung-Min ; Kim, Hyo-Sung ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 21~26
DOI : 10.6113/TKPE.2012.17.1.21
In recent years, DC distribution systems are becoming hot issue due to the increase in digital loads and DC generation systems according to the expansion of renewable energy technologies. However, removing the fault current in DC grids is comparably difficult since the current in DC grids has no zero-crossing point like in AC grids. Thus, developing dedicated DC circuit breakers for DC grids is necessary to get safety for people and electrical facilities. This paper proposes magnet arc extinguishing method to develop a 300[
]/10[A] DC circuit breaker. The performance of the proposed DC circuit breaker was verified by an experimental circuit breaker test system built in this research.
Comparative Study on AC and DC Feed System for Internet Data Center
Kim, Du-Hwan ; Kim, Hyo-Sung ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 27~33
DOI : 10.6113/TKPE.2012.17.1.27
Internet Data Centers (IDC), as essential facilities for modern IT industry, typically have scores of MW of concentrated electric loads. Uninterruptible Power Supplies (UPS) are necessary for the power feed system of IDCs because of stable power requirement. Thus, conventional AC power feed systems of IDCs have three cascaded power conversion stages such as (AC-DC), (DC-AC), and (AC-DC), which results in very low conversion efficiency. On the contrary, DC power feed systems need just a single power conversion stage (AC-DC) supplying AC mains power to DC server loads, which gives comparatively high conversion efficiency and reliability. This paper compares the efficiencies between 220V AC power feed system and 300V DC power feed system on equal load conditions which were established in Mok-Dong IDC of Korea Telecom company (KT). Experimental results show that the total operation efficiency of the 300V DC power feed system is around 15% higher than that of the 220V AC power feed system.
Voltage Clamped Tapped-Inductor Boost Converter with High Voltage Conversion Ratio
Kang, Jung-Min ; Lee, Sang-Hyun ; Hong, Sung-Soo ; Han, Sang-Kyoo ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 34~40
DOI : 10.6113/TKPE.2012.17.1.34
In this paper, voltage clamped tapped-inductor boost converter with high voltage conversion ratio is proposed. The conventional tapped-inductor boost converter has a serious drawback such as high voltage stresses across all power semiconductors due to the high resonant voltage caused by the leakage inductor of tapped inductor. Therefore, the dissipative snubber is essential for absorbing this resonant voltage, which could degrade the overall power conversion efficiency. To overcome these drawbacks, the proposed converter employs a voltage clamping capacitor instead of the dissipative snubber. Therefore, the voltage stresses of all power semiconductors are not only clamped as the output voltage but the power conversion efficiency can also be considerably improved. Moreover, since the energy stored in the clamp capacitor is transferred to the output side together with the input energy, the proposed converter can achieve the higher voltage conversion ratio than the conventional tapped-inductor boost converter. Therefore, the proposed converter is expected to be well suited to various applications demanding the high efficiency and high voltage conversion ratio. To confirm the validity of the proposed circuit, the theoretical analysis and experimental results of the proposed converter are presented.
Current Reference Calculation for Distribution Static Compensator using Phase Shift
Hong, Sung-Min ; Choi, Jong-Woo ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 41~47
DOI : 10.6113/TKPE.2012.17.1.41
This paper proposes a calculation of compensation current using phase shift to eliminate ripple components of instantaneous active power under unbalanced or non-linear loads condition. The proposed phase shift method instead of existing method(LPF; Low Pass Filter) to remove ripple components and this proposed method improves performances of transient and steady state response. To compare proposed method with existing method, experiments have been done for calculating an average active power at load side. Their results show that transient response and steady state response of proposed method is improved.
Power Electronics Converter Education Program using LabVIEW
Kim, Ju-Eun ; Choi, Nam-Sup ; Han, Byung-Moon ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 48~56
DOI : 10.6113/TKPE.2012.17.1.48
This paper deals with power electronic converter education program using LabVIEW. LabVIEW is a graphic based programming language with easy debugging, which is suitable for education program that can be used to study and figure out the operation of power electronic converters. When LabVIEW is employed as a simulation program of the operation of power electronic converters, the resulting program has the advantage such that the effects of the change of control variables and circuit parameters on the various variables such as the output voltage and the inductor current etc can be directly displayed without any separate compiling procedure. This paper shows the design procedure and the characteristics of the power electronics education program implemented by LabVIEW focusing on DC-DC converter among power electronic converters.
Performance Improvement of a Grid-Connected Inverter System using a Sliding-Mode Based Direct Power Control with a Variable Gain
Lee, Byoung-Seoup ; Lee, June-Seok ; Lee, Kyo-Beum ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 57~66
DOI : 10.6113/TKPE.2012.17.1.57
This paper proposes a performance improvement of grid-connected inverter system using sliding-mode based direct power control with a variable gain. The proposed control method determine variable gain of PI controller by using modeling at direct power control (DPC) applied to space vector modulation method. Also, this method use sliding-mode control to maintain excellent dynamic response of character of direct power control (DPC). The validity of the proposed algorithm are verified by simulations and experiments.
Improved Modeling and Control of Boost-Flyback Converter With High Step-Up Voltage Ratio
Seo, Sang-Uk ; Lee, Kui-Jun ; Kim, Rae-Young ; Hyun, Dong-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 67~76
DOI : 10.6113/TKPE.2012.17.1.67
This paper proposes the aggregated modeling and control of integated boost-flyback converter (IBFC) for understanding of dynamics characteristic and designing of relevant controller. The basic concept of the aggregated modeling is to substitute the boost or the flyback converter with an equivalent current source. Since each converter with equivalent current source corresponds to the basic boost and flyback converters, the overall mathematical process is significantly simplified for the modeling. Afterwards each result is combined to construct the complete model of the IBFC, and the relevant controller is designed through the achieved small-signal model. Simulation and experimental results show excellent agreement with the theoretical expectations.
Design of Optimal Resonant Frequency for Series-Loaded Resonant DC-DC Converter in EVs On-Board Battery Charger Application
Oh, Chang-Yeol ; Kim, Jong-Soo ; Lee, Byoung-Kuk ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 77~84
DOI : 10.6113/TKPE.2012.17.1.77
This paper describes the process of optimal resonant frequency design with full-bridge series-loaded resonant dc-dc converter in a high efficiency 3.3 kW on-board battery charger application for Electric Vehicles and Plug-in Hybrid Electric Vehicles. The optimal range of resonant frequency and switching frequency used for ZVS are determined by considering trade-off between loss of switching devices and resonant network with size of passive/magnetic devices. In addition, it is defined charging region of battery, the load of on-board charger, as the area of load by deliberating the characteristic of resonant. It is verified the designed frequency band by reflecting the defined area on resonant frequency.
Design and Implementation of Low Cost Boost Type Single-Phase Inverter System for Compensation of Voltage Sag
Lee, Seung-Yong ; Hong, Soon-Chan ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 1, 2012, Pages 85~92
DOI : 10.6113/TKPE.2012.17.1.85
In this paper, a 300[W] class boost type single-phase inverter system which can compensate voltage sag on source side is designed and implemented. This system is a two-stage conversion system composed of a boost converter and a PWM inverter. If the voltage sag has appeared at the point of common coupling, the boost converter would be operated to compensate it. The boost converter and the inverter were constructed on single smart power module(SPM) to implement low cost system. The system is designed for that the THD of output voltage is below 5[%]. Finally, the validity of the design for the inverter system is verified by both simulations and experiments.