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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 19, Issue 6 - Dec 2014
Volume 19, Issue 5 - Oct 2014
Volume 19, Issue 4 - Aug 2014
Volume 19, Issue 3 - Jun 2014
Volume 19, Issue 2 - Apr 2014
Volume 19, Issue 1 - Feb 2014
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2-Phase Bidirectional Non-Inverting Buck-Boost Converter using Coupled Inductor
Chae, Jun-Young ; Jeong, Seung-Yong ; Cha, Hon-Nyong ; Kim, Heung-Geun ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 481~487
DOI : 10.6113/TKPE.2014.19.6.481
This study proposes a two-phase non-inverting buck-boost converter that uses a coupled inductor. The multi-phase converter has many advantages over single-phase counterparts, such as reduced output current ripple and conduction loss in switching devices and passive elements. Although the output current ripple of the multi-phase converter is reduced significantly because of the interleaved effect, the inductor current ripple is not reduced in multi-phase converters. One of the solutions to this problem is to use a coupled inductor. A 4 kW prototype converter is built and tested to verify the performance of the proposed converter.
Common-mode Voltage Reduction of Three Level Four Leg PWM Converter
Chee, Seung-Jun ; Ko, Sanggi ; Kim, Hyeon-Sik ; Sul, Seung-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 488~493
DOI : 10.6113/TKPE.2014.19.6.488
This paper presents a carrier-based pulse-width modulation(PWM) method for reducing the common-mode voltage of a three-level four-leg converter. The idea of the proposed PWM method is intuitive and easy to be implemented in digital signal processor-based converter control systems. On the basis of the analysis of space-vector PWM(SVPWM) and sinusoidal PWM(SPWM) switching patterns, the fourth leg pole voltage of the three-phase converter called "f leg pole voltage" is manipulated to reduce the common-mode voltage. To synthesize f leg pole voltage for the suppression of the common-mode voltage, positive and negative pole voltage references of f leg are calculated. An offset voltage is also deduced to prevent the distortion of a, b, and c phase voltages. The feasibility of the proposed PWM method is verified by simulation and experimental results. The common-mode voltage of the proposed PWM method in peak-to-peak value is 33% in comparison with that of the conventional SVPWM method. The transition number of the common-mode voltage is also reduced to 25%.
Application of MMC-HVDC System for Regulating Grid Voltage Based on Jeju Island Power System
Quach, Ngoc-Thinh ; Kim, Eel-Hwan ; Lee, Do-Heon ; Kim, Ho-Chan ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 494~502
DOI : 10.6113/TKPE.2014.19.6.494
This paper presents a control method of the modular multilevel converter - high-voltage direct current (MMC-HVDC) system to regulate grid voltage on the basis of the Jeju Island power system. In this case, the MMC-HVDC system is controlled as a static synchronous compensator (Statcom) to exchange the reactive power with the power grid. The operation of the MMC-HVDC system is verified by using the PSCAD/EMTDC simulation program. The Jeju Island power system is first established on the basis of the parameters and measured data from the real Jeju Island power system. This power system consists of two line-commutated converter - high-voltage direct current (LCC-HVDC) systems, two Statcom systems, wind farms, thermal power plants, transformers, and transmission and distribution lines. The proposed control method is then applied by replacing one LCC-HVDC system with a MMC-HVDC system. Simulation results with and without using the MMC-HVDC system are compared to evaluate the effectiveness of the control method.
Bi-Directional Interleaved Current-Fed Resonant Converter with Reduced Sized of Output Filter for FCEV
Moon, Dong-Ok ; Park, Jun-Sung ; Choi, Se-Wan ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 503~510
DOI : 10.6113/TKPE.2014.19.6.503
This study proposes a bi-directional interleaved current-fed resonant converter (CRC) with reduced size of the output filter for a fuel cell electric vehicle. The proposed CRC achieves zero-current switching turn on and off of switches and diodes and makes ripple current of the output capacitor theoretically zero. As a result, the cost and volume of the output capacitor are significantly reduced. The two-stage power conversion technique is also applied for wide input and output voltage range operations. A 2kW prototype of the proposed converter is built and tested to verify the validity of the proposed operation.
Smart Panel Board for EV Standard Chargers and Its Control Method
Kim, Myeong-Soo ; Hong, Soon-Chan ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 511~521
DOI : 10.6113/TKPE.2014.19.6.511
This study proposes an electric vehicle (EV) smart panel board and its control method on the basis of charging scheduling. The proposed system consists of batteries, a three-phase battery charger, three single-phase inverters, transfer switches for electric power distribution, and a controller. The three-phase battery charger usually charges the batteries at midnight when electric rates are cheap and in light load. When the electric power consumption of the EV standard chargers connected to one phase of the power line is relatively large or when a blackout occurs, the electric power stored in the battery is supplied by discharging through the inverters to the EV standard chargers. As a result, the value of peak load and the charging electric power quantity supplied from a utility grid are reduced, and the current unbalance is improved. The usefulness of the proposed system is confirmed through simulations, experiments, and case studies.
Isolation Amplifier Circuits for Sensing and Feedback of the Inverter DC-Link Voltage
Kim, Kyung-Seo ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 522~529
DOI : 10.6113/TKPE.2014.19.6.522
This study proposes an isolation amplifier circuit for the sensing and feedback of inverter DC-link voltage, which is inevitable for the precise control of inverter output voltage. The isolation amplifier consists of a pulse-width modulator and a pulse transformer with dual secondary windings. The accuracy of the proposed circuit depends on the precise matching of filter parameters in dual secondary circuits. The influences of parameter inaccuracy on the amplifier performances are analyzed. A modified circuit is proposed to reduce the dependency on filter parameters. The validity of the proposed method is verified through simulation and experiment.
Study on the Controller Design Method for Battery Energy Storage System using Linearized Battery Model
Kim, Il-Song ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 530~537
DOI : 10.6113/TKPE.2014.19.6.530
A controller design method for a battery-energy storage system using a linearized battery model is presented in this paper. The suggested linear battery model is expressed with open-circuit voltage having three relaxation filters and a linear output equation. A method to obtain on-line resistance and maximum available power is also presented. The battery state of charge information is obtained by Kalman filter, and its performance is verified by FTP75 driving cycles. The controller for power converter is designed and experimented with a 250 V battery pack. The proposed control method is simple and easy to apply to a real system.
Robust Control of a Grid Connected Three-Phase Two-Level Photovoltaic Inverter
Ahn, Kyung-Pil ; Lee, YoungIl ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 538~548
DOI : 10.6113/TKPE.2014.19.6.538
This study provides a robust control of a grid-connected three-phase two-level photo voltaic inverter. The introduced control method uses the cascade control strategy to regulate AC-side current and DC-link voltage. A robust controller with integration action is used for the inner-loop AC-side current control, which maximizes the convergence rate using a linear matrix inequality-based optimization design method and eliminates the offset error. The robust controller design method considers the parameter uncertainty set to accommodate parameter mismatch and un-modeled components in the inverter model. An outer-loop proportional-integral controller is used to regulate DC-link voltage with linearization of DC/AC relation. The proposed control strategy is applied to a grid-connected 100 kW photo voltaic inverter.
A Study on the Parallel Operation Strategy of Small Wind Turbine System for Battery Charging
Son, Yung-Deug ; Ku, Hyun-Keun ; Kim, Jang-Mok ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 549~556
DOI : 10.6113/TKPE.2014.19.6.549
This study proposes a parallel operation strategy for small wind turbine systems. A small wind turbine system consists of blade, permanent magnet synchronous generator, three-phase diode rectifier, DC/DC buck converter, and the battery load. This configuration has reliability, simple control algorithm, high efficiency, and low cost. In spite of these advantages, the system stops when unexpected failures occur. Possible failures can be divided into mechanical and electrical parts. The proposed strategy focuses on the failure of electrical parts, which is verified by numerical analysis through equivalent circuit and acquired general formula of small wind power generation systems. Simulation and experimental results prove its efficiency and usefulness.
Development of the Anti-Start Air Conditioner Compressor Resonant DC/DC Converter for Commercial Vehicle
Han, Keun-Woo ; Kim, Seong-Gon ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 557~563
DOI : 10.6113/TKPE.2014.19.6.557
This study deals with a resonant converter of an anti-start air conditioner compressor for commercial vehicles. The anti-start air conditioner compressor must generally have a high current, high efficiency, a low volume, and a low weight. To reduce the switching losses and voltage and current stresses of the device, the anti-start air conditioner compressor applies the full-bridge L-C resonant converter topology. Hardware parameters are designed to have a wide voltage range, and the switching frequency range of the L-C resonant converter is determined. Simulation is implemented using PSIM and an experiment is performed to verify the proposed converter.
Single Stage Current-Balancing Multi-Channel LED Driver for LED TV
Ryu, Dong-Kyun ; Won, Chung-Yuen ; Han, Sang-Kyoo ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 564~571
DOI : 10.6113/TKPE.2014.19.6.564
A single-stage current-balancing multi-channel light-emitting diode (LED) driver is proposed in this study. The conventional LED driver system consists of two cascaded power conversion stages, i.e., an isolation DC/DC converter and LED driver. LED driver is usually implemented with the same number of expensive boost converters as those of LED channels to tightly control the current through each LED channel. Therefore, its overall system size is not only bulky, but the cost is rather high. By contrast, the proposed LED driver system is composed of a single power stage with the DC/DC converter and LED driver merged. Although the current balancing circuit of the proposed LED driver requires only passive devices instead of expensive boost converters, all currents through multi-channel LEDs can be well balanced. Therefore, the proposed LED driver features a small system size, improved efficiency, and low cost. To confirm the validity of the proposed driver, its operation and performance are verified on a prototype for a 46" LED TV.
Reduction of Current Distortion in PWM Inverter by Variable DC-link Voltage of DC-DC Converter for FCEV
Ko, An-Yeol ; Kim, Do-Yun ; Lee, Jung-Hyo ; Kim, Young-Real ; Won, Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 6, 2014, Pages 572~581
DOI : 10.6113/TKPE.2014.19.6.572
A design and control method of DC/DC converter, which can control variable DC-link voltage to drive a fuel cell electric vehicle (FCEV), is proposed in this study. Given that a fuel cell has low-voltage and high-current characteristics, the required voltage for operating motor must be output through the DC/DC boost converter in the system to drive an FCEV. The proposed converter can choose the output voltage of battery or fuel cell in consideration of the driving mode, as well as control DC-link voltage in accordance with the back electromotive force. The switching lag-time to prevent shortage of pulse-width modulation inverter arms makes distorted current waveform caused by voltage distortion. Through this control method, the proposed converter can reduce the output voltage distortion and current ripple of the inverter, thereby reducing the distorted torque. Simulations and experimental results are presented to verify the reliability of the proposed DC/DC converter.