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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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DC-link Voltage Control of Grid Connected PV System using Quasi Z-Source Inverter
Park, Jong-Hyoung ; Kim, Heung-Geun ; Nho, Eui-Cheol ; Chun, Tae-Won ; Cha, Honnyong ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 201~210
DOI : 10.6113/TKPE.2014.19.3.201
In this paper, dc-link voltage control of a grid-connected QZSI is presented. Since the input current of the ZSI is discontinuous, a capacity with relatively large capacitance should be connected to the output of the PV array in order to reduce the current ripple. Due to the presence of the impedance network inductor in series with the PV array, the QZSI can achieve continuous input current flow. Several dc-link voltage control methods are compared and the method for power quality improvement is also presented. The performance of the proposed method is verified through both simulation and experimental results.
Design of Power Supply for Green PC using Low Voltage High Current LLC Resonant Converter
Yoo, Young-Do ; Kim, In-Dong ; Nho, Eui-Cheol ; Ryu, Myung-Hyo ; Baek, Ju-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 211~219
DOI : 10.6113/TKPE.2014.19.3.211
This paper proposes a low voltage high current LLC resonant converter for Green PC. Green PC is composed of a lot of blade PCs, and it is a centralized system to manage them in computer center. Green PC should require that its power supplies have several characteristics such as low output voltage, high output current, and high power conversion efficiency. Conventional PSFB (Phase Shift Full Bridge) converter is usually used as DC/DC converter for computer power supply because it has high power conversion efficiency thanks to ZVS (Zero Voltage Switching) operation under middle and high load conditions. However, this converter has some problems such as large switching noise and limitation of ZVS operation under light load condition. In order to improve the performance of power supply for Green PC, a new power supply using popular high efficiency LLC resonant converter for low voltage and high current application is proposed in this paper. The proposed power supply has ZVS capability over the entire load range, thus resulting in good efficiency and high switching frequency. Experimental results verify the performance of the proposed power supply for Green PC using 2[kW] (19[V], 105[A]) rated prototype converter.
Input Current Ripple Reduction Algorithm for Interleaved DC-DC Converter
Joo, Dong-Myoung ; Kim, Dong-Hee ; Lee, Byoung-Kuk ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 220~226
DOI : 10.6113/TKPE.2014.19.3.220
Input current ripple and harmonic components of the power device are main causes of electromagnetic interference (EMI). Although the discontinuous conduction mode (DCM) operation can reduce harmonic components of the power device by reducing reverse recovery current of diode and turn-off voltage spikes of the switch, input current ripple increases due to high peak to peak inductor current. Therefore, in this paper, frequency control algorithm is proposed to reduce the input current ripple of DCM operated interleaved boost converter. In the proposed algorithm, duty ratio is fixed either 0.33 or 0.67 to minimize the input current ripple and the switching frequency is controlled according to operating conditions. 600 W 3-phase interleaved boost converter prototype system is built to verify proposed algorithm.
Highly Efficient MOSFET Inverter for Single-Phase Grid-Connected Photovoltaic Power Generation Systems
Ryu, Hyung-Min ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 227~232
DOI : 10.6113/TKPE.2014.19.3.227
A highly efficient MOSFET inverter for single-phase grid-connected photovoltaic power generation systems is presented in this paper. It is a full-MOSFET version of the conventional transformerless full-bridge inverter with dual L-C filters using unipolar PWM. The key idea lies on smart pre switching(SPS), which can make the large switching loss due to a poor reverse recovery of the MOSFET's body diode reduced dramatically. The validity of the proposed inverter is verified by experiment.
Parallel Operation Method using New Cubic Equation Droop Control of Three-Phase AC/DC PWM Converter for DC Distribution Systems
Shin, Soo-Choel ; Lee, Hee-Jun ; Park, Yun-Wook ; Hong, Seok-Jin ; Won, Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 233~239
DOI : 10.6113/TKPE.2014.19.3.233
This paper proposes that each converter supplies the power using the proposed droop control for the parallel operation of the converters. The proposed method is easy to increase the power as parallel system in DC distribution. By improving conventional droop-control method used in AC grid newly, a droop controller is designed to apply droop control in DC grid. And the control method of the proposed droop controller is explained particularly. In this paper, by applying the proposed control method to DC distribution system, propriety is verified through the simulation and the experiment.
Integrated Operation of Power Conversion Module for DC Distribution System
Lee, Hee-Jun ; Shin, Soo-Choel ; Hong, Suk-Jin ; Won, Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 240~248
DOI : 10.6113/TKPE.2014.19.3.240
It is DC power that Output of renewable energy being recently developed and researched. Also, demand of DC power will expect to proliferate due to increase of digital load. Thus, DC distribution system providing high quality of power and reliability has emerged as a new distribution system. If the conventional distribution systems are substituted by proposed DC distribution system, the output of renewable energy can be connected with distribution systems under minimum power conversion. Therefore, in the event of connection with DC load, it can construct an efficient distribution system. In this paper, the integrated parallel operation of power conversion module for DC distribution system is proposed. Also, this paper proposed modularization of power conversion devices for DC distribution system and power control for parallel operation of large capacity system. DC distribution system consists of three power conversion modules such as AC/DC power conversion module 2 set, ESS module 1 set. DC distribution system controls suitable operation depending on the status of the DC power distribution system and load. Integrated operation of these systems is verified by simulation and experiment results.
Torque Tracking and Ripple Reduction of Permanent Magnet Synchronous Motor using Finite Control Set-Model Predictive Control (FCS-MPC)
Park, Hyo-Seong ; Lee, YoungIl ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 249~256
DOI : 10.6113/TKPE.2014.19.3.249
This paper proposes a torque control method of permanent magnet synchronous motor, which has small torque ripple. The proposed control method is using the finite control set-model predictive control(FCS-MPC) strategy. An optimal input voltage vector minimizing a cost function is chosen among 6 passible active input voltage vectors following the FCS-MPC strategy. Then, a modulation factor for the optimal input voltage vector is computed to minimize the torque ripple. Thus, the proposed control method yields fast torque response and small torque ripple. The efficacy of the proposed method was verified through simulation and experiment.
Simple Compensation Method of Unclamped Switch Voltages in a Three-Level NPC Inverter
Ji, Kyun-Seon ; Jou, Sung-Tak ; Jeong, Hae-Gwang ; Lee, Kyo-Beum ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 257~265
DOI : 10.6113/TKPE.2014.19.3.257
This paper proposes a simple compensation method for switches of the unclamped voltage in the three-level NPC inverter. Voltages of inner-switches can be unclamped in the three-level NPC (neutral point clamped) inverter. It can cause the problem of the switch fault accident. By adding a capacitor, switches of the unclamped voltage can be clamped. Through the analysis of the circuit, the reason behind switches being unclamped was verified which leads to the solution method that designs a compensation capacitor. The proposed method was validated through the simulation and experimental results.
Hybrid UPS with Energy Storage System Function
Lim, Seung-Beom ; Hong, Soon-Chan ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 266~275
DOI : 10.6113/TKPE.2014.19.3.266
This paper proposes the hybrid UPS(Uninterruptible Power Supply) with ESS(Energy Storage System) function. The proposed hybrid UPS is operating in four states, which are normal state, battery state, ESS state, and bypass state. In case of peak load time or power shortage, the system is operating in ESS state in which the stored energy of the battery is used to manage the power effectively. The validity of proposed system are verified by simulations and experiments.
Low Frequency Current Reduction using a Quasi-Notch Filter operated in Two-Stage DC-DC-AC Grid-Connected Systems
Jung, Hong-Ju ; Kim, Rae-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 276~282
DOI : 10.6113/TKPE.2014.19.3.276
In a single-phase grid-connected power system consisting of a dc-dc converter and a dc-ac converter, the current drawn from renewable energy sources has a tendency to be pulsated and contains double-fundamental frequency ripple components, which results in several drawback such as a power harvesting loss and a shortening of the energy source's life. This paper presents a new double-fundamental current reduction-scheme with a fast dc-link voltage loop for two-stage dc-dc-ac grid connected systems. In the frequency domain, an adequate control design is performed based on the small-signal transfer function of a two-stage dc-dc-ac converter. To verify the effectiveness of proposed control algorithm, a 1 kW hardware prototype has been built and experimental results are presented.
Comparative Performance Evaluation of Si MOSFET and GaN FET Power System
Ahn, Jung-Hoon ; Lee, Byoung-Kuk ; Kim, Jong-Soo ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 283~289
DOI : 10.6113/TKPE.2014.19.3.283
This paper carries out a series of analysis of power system using Gallium Nitride (GaN) FET which has wide band gap (WBG) characteristics comparing to conventional Si MOSFET-used power system. At first, for comparison of each semiconductor device, the switching-transient parameter is quantitatively extracted from released information of GaN FET. And GaN FET model which reflect this dynamic property is configured. By using this model, the performance of GaN FET is analyzed comparing to Si MOSFET. Also, in order to enable a representative assessment on the power system level, Si MOSFET and GaN FET are applied to the most common structure of power system, full-bridge, and each power systems are compared based on various criteria, such as performance, efficiency and power density. The entire process is verified with the aid of mathematical analysis and simulation.
Control of the Z-Source Inverter using Average Model
Lee, Kwang-Woon ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 290~296
DOI : 10.6113/TKPE.2014.19.3.290
This paper presents a design strategy for the control of the Z-source inverter (ZSI). For the Z-network capacitor voltage control, the average current model is derived to describe the dynamics of the voltage control and the controller outputs the average current command for the capacitor. Z-network inductor current reference is derived from the average current model of the Z-network capacitor. The inner current control loop outputs the average voltage command for the Z-network inductor and the shoot-through duty ratio of the ZSI is calculated from the output using the average voltage model of the Z-network inductor. The gain values of the current and voltage controllers are directly obtained by the Z-network parameters and desired bandwidth of each controller without a gain tuning process.