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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 16, Issue 6 - Dec 2011
Volume 16, Issue 5 - Oct 2011
Volume 16, Issue 4 - Aug 2011
Volume 16, Issue 3 - Jun 2011
Volume 16, Issue 2 - Apr 2011
Volume 16, Issue 1 - Feb 2011
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Synchronization Techniques for Single-Phase and Three-Phase Grid Connected Inverters using PLL Algorithm
Chun, Tae-Won ; Lee, Hong-Hee ; Kim, Heung-Geun ; Nho, Eui-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 309~316
DOI : 10.6113/TKPE.2011.16.4.309
A PLL system has widely used for synchronizing the grid voltage at the grid-connected inverter for supplying power from the PV generation systems. In this paper, a PLL algorithm without both the loop filter and PI controller is suggested for improving the performance of synchronization at the single-phase and three-phase grid connected inverters. In order that the output voltage of a phase detector in the PLL has only a dc voltage, and it approaches to 0 when the synchronization signal is locked to the grid voltage, the feedback signals are determined by using two-phase voltages. After the PLL system with a proportional controller is modelled with the small signal analysis, the stability and steady-state error are investigated. Through the simulation studies and experimental results, the performances of the proposed PLL algorithm are verified.
Design of Robust Voltage Controller for Single-phase UPS Inverter
Ku, Dae-Kwan ; Ji, Jun-Keun ; Cha, Guee-Soo ; Moon, Jun-Hee ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 317~325
DOI : 10.6113/TKPE.2011.16.4.317
In this paper a robust voltage controller for a single-phase UPS inverter is newly presented. The voltage controller is designed using
-based robust control scheme to simultaneously guarantee robust stability and robust tracking performance in the presence of load variations. Firstly the robust performance of the resulting controller is theoretically confirmed via
-analysis. Then simulations and experiments for the single-phase inverter system with linear and nonlinear loads demonstrate feasibility of the proposed control method providing improved performance - good regulation and fast dynamic response.
Comparison of Battery Charging Strategies for PHEVs using Propulsion Motor Inductance and Multi-Function Inverter
Woo, Dong-Gyun ; Choe, Gyu-Yeong ; Kim, Jong-Soo ; Lee, Byoung-Kuk ; Kang, Gu-Bae ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 326~333
DOI : 10.6113/TKPE.2011.16.4.326
This paper studies battery charging methods using existing motor inductance and 3-phase inverters without an additional charger to charge the battery of Plug-in Hybrid Electric Vehicles (PHEVs). As inverter switch control and motor coil used as the energy storage device for boosting make the system the boost converter, the additional charger is eliminated and volume, weight, and cost for the charger are reduced. Various charging methods according to topologies of the system and configurations of the controller are analyzed and verified by PSIM simulation.
Isolated DC/DC Converter with Very Wide Input Voltage Ranges for Emergency Power Back-up System(EPBS)
Chae, Hyung-Jun ; Kim, Kyoung-Dong ; Oh, Hyung-Rock ; Lee, Jun-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 334~341
DOI : 10.6113/TKPE.2011.16.4.334
This paper presents a design and implementation of DC/DC converter with very wide input voltage ranges for EPBS whose input voltage is from 30V to 400V and output voltage is 48V. This converter is comprised of two stages that one is for control and the other is for only galvanic isolation. The proposed converter uses the hard-switched buck-boost topology for control purpose and soft-switched LLC resonant converter for isolation. The proposed converter has been verified with 300W design.
Autonomous Operation Analysis of DC Microgrid based on Droop Control
Lee, Ji-Heon ; Kim, Hyun-Jun ; Han, Byung-Moon ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 342~350
DOI : 10.6113/TKPE.2011.16.4.342
This paper describes the autonomous operation analysis of DC microgrid based on droop control. In order to verify the whole system operation, detailed simulation models for wind power generation, solar power generation, and battery were developed with user-defined models programmed with C-code in PSCAD/ EMTDC software. The simulation results confirm that the DC microgrid with droop control make it feasible to provide power to the load with stable manner. Based on simulation results a prototype of DC microgrid was built and tested in the lab to verify the autonomous operation experimentally. The droop control scheme can suppress the circulating current, and offers each unit to be controlled autonomously without any communication link.
Position Sensor Fault Tolerant Control of Permanent Magnet Synchronous Generator
Lee, Kwang-Woon ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 351~357
DOI : 10.6113/TKPE.2011.16.4.351
Rotor position is essentially required for vector control of permanent magnet synchronous generator(PMSG) and position sensor such as encoder are generally used for the purpose of position sensing. However, the use of position sensor degrades reliability of PMSG control system. This paper presents position sensor fault tolerant control method for PMSG control system. Sensorless position estimator based on extended electromotive force(EMF) is operated in parallel with sensored vector control to provide rapid reconfiguration capability to sensorless vector control at the moment of position sensor fault detection. Experimental results show the effectiveness of the proposed method.
High Efficiency Switch-Mode LED driver for Visible Light Communication System
Kang, Jung-Min ; Cho, Sang-Ho ; Hong, Sung-Soo ; Han, Sang-Kyoo ; SaKong, Suk-Chin ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 358~365
DOI : 10.6113/TKPE.2011.16.4.358
Recently, the LED(Light Emitting Diode) replacing incandescent light bulbs and fluorescent light has great attentions as a most promising candidate for the next generation lighting source due to its environment-friendly characteristics, long life and excellent efficiency. Moreover, since it is a semiconductor device which can convert the electric energy to visible light at a very high speed, it can also used as a communication device. Therefore, the VLC(Visible Light Communication) using the LED can perform the near field communication and lighting function at the same time without additional expenses. However, since the switching device of the conventional LED driver for VLC is operated in the linear region, there exist several drawbacks such as a poor power conversion efficiency and serious heat generation. On the other hand, since the proposed driver is operated in the on/off switching region, it features a higher efficiency and more improved heat generation. To verify the validity of the proposed LED driver, experimental results from a prototype of 20W rated LED driver applied to 3MHz bps broadcasting audio system are given.
Magnetic Switch Auto Control Method of the High-Voltage Pulse Power Supply
Kim, Soo-Hong ; Lee, Jeong-Hum ; Kim, Byong-Seob ; Kwon, Byung-Ki ; Choi, Chang-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 366~373
DOI : 10.6113/TKPE.2011.16.4.366
The magnetic switch used in pulsed-power applications is superior in its high repetition rate, high stability, and long lifetime. But magnetic switch was optimized switching operation by manual control. When the load changes, the switching state can not be optimized automatically. In this paper, the auto control method of magnetic switch for high pulsed-power proposed. The magnetic switch is used capacitor charging power supply for high-voltage compressor. The proposed method can be optimized an efficiency of the system by magnetic switch auto control according to load variation. And the proposed method verify the experimental results.
Initial Rotor Position Estimation for an Interior Permanent-Magnet Synchronous Motor using Inductance Saturation
Park, Nae-Chun ; Lee, Yoon-Kyu ; Kim, Sang-Hoon ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 374~381
DOI : 10.6113/TKPE.2011.16.4.374
This paper proposes a new method to acquire an initial rotor position for IPMSM(Interior Permanent Magnet Synchronous Motor) without a position sensor at standstill. The proposed method is based on the variation of inductance caused by the magnetic saturation of stator core. Minimum number of voltage vectors are chosen to determine the initial rotor position. By using the resultant currents in combination with the inductance variation, the north pole and the absolute position of the rotor can be easily obtained. This method also has the advantage of not requiring motor parameters and additional hardware. Its validity is verified by experiments.
A Novel LLC Resonant Converter for Single-Stage Adapter
Jang, Sang-Ho ; Yoon, Kwang-Ho ; No, Young-Jae ; Kang, Cheol-Ha ; Kim, Eun-Soo ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 382~395
DOI : 10.6113/TKPE.2011.16.4.382
In this paper, for adapter with power level below approximately 60W, a novel LLC resonant converter preceded by diode rectifier with a capacitor filter is presented. Due to the switching operation of the auxiliary switching device, the proposed LLC resonant converter can deliver power with the high efficiency characteristics from the universal line(
) and load conditions. The operating schemes on the proposed converter are analyzed and described. A 60W prototype product is built, tested and verified.
LVRT control of Grid-Connected Wind Turbine Using Sliding-Mode Based Direct Power Control
Jeong, Hae-Gwang ; Lee, Kyo-Beum ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 396~404
DOI : 10.6113/TKPE.2011.16.4.396
This paper proposes a performance improvement of a grid-connected wind turbine using sliding-mode based direct power control under an unbalanced grid fault. The proposed control method has some advantages for grid connected control. At first, it doesn't need the synchronous phase angle of the grid voltage. It has also fast dynamic characteristics compared with a conventional current controller. In addition, it is suitable for an unbalance compensation control. The effectiveness and robustness of the proposed algorithm are verified by simulations and experiments.
Optimized Topology and LCL Filter Design of Utility-interactive PCS for MCFC Generation
Kim, Hyung-Jin ; Park, Jun-Sung ; Kim, Young-Woo ; Choi, Se-Wan ; Kim, Tae-Hee ; Lee, Gi-Pung ; Lee, Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 4, 2011, Pages 405~414
DOI : 10.6113/TKPE.2011.16.4.405
Recently, the development of several hundreds of kW scale PCS for fuel cell generation is required as commercialization process of distributed generation systems using high temperature fuel cells such as MCFC begins. This paper proposes and optimized topology suitable for MCFC fuel cell generation system and LCL filter design method considering voltage quality of local loads such as MBOP. An interleaving technique is applied to step-up DC-DC converter, optimized number of phases is determined considering efficiency and volume. Also, a LCL filter design method is proposed considering quality of current injected to the grid as well as that of voltage across the local load. The proposed PCS system is validated through reduced 1kW prototype.