Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Transactions of the Korean Institute of Power Electronics
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
Editor in Chief :
Volume & Issues
Volume 14, Issue 6 - Dec 2009
Volume 14, Issue 5 - Oct 2009
Volume 14, Issue 4 - Aug 2009
Volume 14, Issue 3 - Jun 2009
Volume 14, Issue 2 - Apr 2009
Volume 14, Issue 1 - Feb 2009
Selecting the target year
A Resonant-type Step-up DC/DC Converters with Piezoelectric Transducer
Park, Joung-Hu ; Seo, Gab-Su ; Cho, Bo-Hyung ; Yi, Kyung-Pyo ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 5, 2009, Pages 343~354
In this paper, a magnetic-less dc-dc switching converter realizing an integrable power conversion system is described. Instead of magnetic devices, the inductive impedance range of piezoelectric transducers is utilized to store and resonate the energy for soft-switching. Piezoelectric devices have no windings and deliver the power by the electrodes, which lead to mass product through semiconductor-manufacturing process. This paper presents a resonant-type step-up dc-dc power converter employing a disk-type piezoelectric transducer, analyzing the operation principles and the frequency control characteristics. Also, a topology extension of the single stage converter into cascaded multi-stage is presented and analyzed with the operation principles and control characteristics. For verification of the analysis, a 10W output dc-dc power converter hardware was implemented. The hardware experiments shows a good frequency control and power efficiency greater than 96% in the single stage. A hardware prototype of the extended multi-stage one was also realized and tested. The results shows that the converter has the same frequency control performance and high efficiency such as 93%.
Inverter Design and Control for Driving Electro-Luminescence Sheet
Lee, Seung-Yo ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 5, 2009, Pages 355~364
Electro-Luminescence (EL) sheets have been widely used in lighting displays, mainly used as advertisement panels. To drive the ELs in optimal conditions, it is required to understand the load profile of the EL. Hence, in this paper, a modeling for an EL sheet was performed to analyze the load characteristics of the EL. Based on the extracted model of the EL, a topology for inverter system was chosen and the optimal design parameters were obtained. The validity of the designed EL driver system was verified through computer simulations and experiments.
A Study on the Optimal Operation Schemes for Large-scale Wind Farm
Jeon, Young-Soo ; Choy, Young-Do ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 5, 2009, Pages 365~371
This paper studies the optimal operation schemes for large scale wind farm. With few operation experiences and fundamental technology for the wind farm, there is a difficult to establish the grid code which is the standard for connecting wind farm to power system. Analysis of the grid code and the operation of other nations for wind farm is used to propose the optimal operation schemes for large-scale wind farm considering the characteristic of our power system, by analyzing the influence of power system by wind farm at Cheju island.
A Novel Parameter Extraction Method for the Solar Cell Model
Kim, Wook ; Kim, Sang-Hyun ; Lee, Jong-Hak ; Choi, Woo-Jin ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 5, 2009, Pages 372~378
With the increase in capacity of photovoltaic generation systems, studies are being actively conducted to improve system efficiency. In order to develop the high performance photovoltaic power system it is required to understand the physical characteristics of the solar cell. However, solar cell models have a non-linear form with many parameters entangled and conventional methods suggested to extract the parameters of the solar cell model require some kind of assumptions, which accompanies the calculation errors, thereby lowering the accuracy of the model. Therefore, in this paper a novel method is proposed to calculate the ideality factor and reverse saturation current of the solar cell from the I-V curve measured and announced by solar cell manufacturers, derive the ideal I-V curve, and then extract the series and shunt resistances value from the difference between the ideal and measured I-V curve. Also, validity of the proposed method is demonstrated by calculating the correlation between I-V curve based on modeling parameters and I-V curve actually measured through least squares method.
Output Control of ITER Vertical Stabilization Converter with Circulating Current Technique
Chung, Gyo-Bum ; Ji, Jun-Keun ; Mok, Hyung-Soo ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 5, 2009, Pages 379~386
This paper investigates the operation of ITER(International Thermonuclear Experimental Reactor) Vertical Stabilization(VS) converter with circulating current. The VS converter has two subunits in parallel. The subunit is composed two back-to-back 12 pulse thyristor converter in series. The circulating current free technique can not always maintain the closed path for the load current because of a dead time zone of the converter operation at the region of the load current inversion. The complex circulation current technique for the load current inversion with VS converter can achieve the fast response and always maintain the closed path for the load curret. The paper proposes the new circulating current algorithm for the load current inversion of ITER VS converter and proves the performance of the circulating current technique with PSIM simulation study.
State Space Averaging Based Analysis of the Lithium Battery Charge/Discharge System
Won, Hwa-Young ; Chae, Soo-Yong ; Hong, Soon-Chan ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 5, 2009, Pages 387~396
The life and performance of lithium battery are greatly influenced by the formation process which is essential in the process of manufacture. Charge/discharge system for the lithium battery are required for the formation process. To simulate such a system in a conventional method takes very long time and requires huge memory space to save data files. So the simulation may be impossible with a general-purpose PC. In this paper, the lithium battery is modelled to a resistor-capacitor serial circuit and the lithium battery charge/discharge system is analyzed and simulated by using state space averaging method. As a result, the simulation time is reduced dramatically and the simulation of the lithium battery charge/discharge system becomes possible on a general-purpose PC within 3 hours. Also, both the charge/discharge characteristics and the time required to charge/discharge of the lithium battery charge/discharge system can be observed. To verify the propriety of resistor-capacitor serial circuit modeling method for lithium battery and the validity of the analysis and simulation based on state space averaging, the lithium battery charge/discharge system is composed and experimentations are carried out.
Two Phase Interleaved LLC Resonant Converter
Kim, Joo-Hoon ; Lee, Kwang-Ho ; Kim, Eun-Soo ; Lee, Jae-Sam ; Lee, Hyun-Kwan ; Jung, Yong-Chae ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 5, 2009, Pages 397~405
Nowadays, power supplies for LCD TV of larger and slimmer screen size are required to have high power density and high efficient characteristics. In order to meet these requirements, Multi-phase interleaved LLC resonant converter is applied for increasing power density and reducing the current rating in the used devices. In this paper, gain characteristics and the experimental results of the proposed two-phase LLC resonant converter which implemented by the simple control circuit are verified based on the theoretical analysis and the 300W experimental prototype.
LLC Resonant Converter with Two Transformers and Resonant Tanks
Kim, Joo-Hoon ; Kang, Sung-In ; Kim, Eun-Soo ; Jun, Yong-Suk ; Lee, Jae-Sam ; Huh, Dong-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 5, 2009, Pages 406~414
To cope with the high power density and low cost in switching power supply, LLC resonant converters with the two resonant tank circuits composed of resonance capacitors and two transformers are proposed in this paper. Each transformers used for the proposed resonant circuits are parallel connected in the primary and series connected in the secondary to reduce the current unbalance. The proposed LLC resonant converters are described and verified on 300W experimental prototype.
Improved Operating Method of Utility Interactive PV System for Peak Power Cut Effect
Kim, Young-Sik ; Bayasgalan, Dugarjav ; Heo, Hye-Seong ; Choe, Gyu-Ha ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 5, 2009, Pages 415~422
This paper describes the UIPV(Utility Interactived Photovoltaic) system which can improve the peak-cut effect by adding energy storage device of batteries to the power converter. The proposed system has three possible operation modes depending on relative condition of PV output, which can have the power shaping function covering the peak power for 3 hours. A new power circuit and application algorithm has been applied to UIPV system which is based on working PV system during 3-hour peak time. The energy relationship by the proposed system is analyzed theoretically and experimentally. Also the proposed system is evaluated at the viewpoint of cost and total spacing, which enables the proposed UIPV system to have the reduction of the peak power demand and hence to improve.
A Electrical Fire Disaster Prevention Device of High Speed and High Precision by using Semiconductor Switching Devices
Kwak, Dong-Kurl ;
The Transactions of the Korean Institute of Power Electronics, volume 14, issue 5, 2009, Pages 423~430
Recently as the inactive response characteristics of the existing RCD used on low voltage power distribution system, so control of overload and electric short circuit faults, major causes of electrical fires, are not enough. Therefore, this paper confirms the unreliability of the existing RCD by electrical fault simulator and proposes a EFDPD by using semiconductor switching devices and a high precision current sensor (namely, reed switch) for the prevention of electrical disasters in low voltage power distribution system caused by overload or electric short circuit faults. The sensitive reed switch in the proposed EFDPD exactly detects the increased magnetic flux with the overload or the short current caused by a number of electrical faults, and the following, the self circuit breaker in EFDPD rapidly cuts off the system. The proposed EFDPD confirms the excellent characteristics in response velocity and accuracy in comparison with the conventional circuit breaker through various operation performance analysis. The proposed EFDPD can also prevent electrical disasters, like as electrical fires, which resulted from the malfunction and inactive response characteristics of the existing RCD.