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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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The Korean Institute of Power Electronics
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Volume & Issues
Volume 18, Issue 6 - Dec 2013
Volume 18, Issue 5 - Oct 2013
Volume 18, Issue 4 - Aug 2013
Volume 18, Issue 3 - Jun 2013
Volume 18, Issue 2 - Apr 2013
Volume 18, Issue 1 - Feb 2013
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Characteristics of the Stress Reduction and Output Voltage of ST(Switched Trans) Quasi Z-Source Inverter
Kim, Se-Jin ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 1~9
DOI : 10.6113/TKPE.2013.18.1.1
This paper proposes a ST(Switched Trans) quasi Z-source inverter using a Switched Trans Cell combing the characteristics of a Switched Inductor Cell and Trans. A DC link inductor of the conventional quasi Z-source inverter is alternated with Switched Trans Cell of the proposed ST quasi Z-source inverter. Trans Cell of the proposed method consists of one Trans and two diodes, and the proposed method has higher and more various boost function than the conventional quasi Z-source inverter by simply changing the turns ratio of primary and secondary of the Trans. The validity of the proposed ST Z-source inverter was confirmed by PSIM simulation and a DSP based experiment under the input voltage 48V and output phase voltage 30V. As a result, when compared with the traditional quasi Z-source inverter, the proposed method has the advantage of the low voltage stress under the same output voltage condition of the voltage.
Active Damping of LCL Filter for Three-phase PWM Inverter without Additional Hardware Sensors
An, Byoung-Woong ; Shin, Hee-Keun ; Kim, Hag-Wone ; Cho, Kwan-Yuhl ; Han, Byoung-Moon ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 10~17
DOI : 10.6113/TKPE.2013.18.1.10
In this paper, a new active damping method of LCL filter without capacitor voltage sensors is proposed for 3 phase PWM Inverter. Normally, L filter or LCL filter is used as an output filter of grid connected PWM inverter. An LCL filter has more excellent performance than L filter to reduce harmonic current, so the small inductance value can be used. However, the resonance problem in LCL filter is happen due to the zero impedance by the addition of LC branch. To solve the resonance problem, the various active damping method has been proposed so far. Generally, the virtual resistor active damping methods is required to additional hardware sensors for measurement of capacitor voltage and current. In this paper, the new active damping method is proposed without any capacitor voltage or current sensors. In the proposed method, the resonance component of the capacitor voltage of LCL filter can be observed by a simple MRAS(Model Reference Adaptive System) observer without additional hardware sensors, and this component is suppressed by feedforward compensation. The validity of the proposed method is proven by simulation and experiment on the 3-phase PWM inverter system.
Nonlinear and Adaptive Back-Stepping Speed Control of IPMSM
Jeon, Yong-Ho ; Jung, Seung-Hwan ; Choy, Ick ; Cho, Whang ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 18~25
DOI : 10.6113/TKPE.2013.18.1.18
In this paper, a nonlinear controller based on adaptive back-stepping method is proposed for high performance operation of Interior Permanent Magnet Synchronous Motor (IPMSM). First, in order to improve the performance of speed tracking, a nonlinear back-stepping controller is designed. In addition, since it is difficult to achieve the high quality control performance without considering parameter variation, a parameter estimator is included to adapt to the variation of load torque in real time. Finally, for the efficiency of power consumption of the motor, controller is designed to operate motor with the minimum current for the required maximum torque. The proposed controller is tested through experiment with a 1-hp Interior Permanent Magnet Synchronous Motor (IPMSM) for the angular velocity reference tracking performance and load torque volatility estimation, and to test the Maximum Torque per Ampere (MTPA) operation. The result verifies the efficacy of the proposed controller.
A Design and Control of Rapid Electric Vehicle Charging System for Lithium-Ion Battery
Kang, Taewon ; Suh, Yongsug ; Park, Hyeoncheol ; Kang, Byungik ; Kim, Simon ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 26~36
DOI : 10.6113/TKPE.2013.18.1.26
This paper presents a simple and cost-effective stand-alone rapid battery charging system of 30kW for electric vehicles. The proposed system mainly consists of active front-end rectifier of neutral point clamped 3-level type and non-isolated bi-directional dc-dc converter of multi-phase interleaved half-bridge topology. The charging system is designed to operate for both lithium-polymer and lithium-ion batteries. The complete charging sequence is made up of three sub-interval operating modes; pre-charge mode, constant-current mode, and constant-voltage mode. The pre-charge mode employs the stair-case shaped current profile to accomplish shorter charging time while maintaining the reliable operation of the battery. The proposed system is specified to reach the full-charge state within less than 16min for the battery capacity of 8kWh by supplying the charging current of 78A. Owing to the simple and compact power conversion scheme, the proposed solution has superior module-friendly mechanical structure which is absolutely required to realize flexible power expansion capability in a very high-current rapid charging system.
Compensation Scheme for Output Voltage Distortion in Fuel Cell Stack with Internal Humidifier
Koo, Keun-Wan ; Woo, Dong-Gyun ; Joo, Dong-Myoung ; Lee, Byoung-Kuk ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 37~44
DOI : 10.6113/TKPE.2013.18.1.37
In this paper, the characteristics of portable fuel cell system are introduced and the dynamic response of output voltage of fuel cell stack with internal humidifier is analyzed. When the output of the fuel cell (FC) stack is short-circuited for humidification, the output voltage of the FC stack rapidly drops. In order to maintain the load voltage in the required range, dynamic compensation methods are proposed: 1) installing a capacitor behind the output of the FC stack; 2) utilizing the bi-directional converter. Especially, bi-directional converter is used when short of the FC output is detected or predicted by algorithm using data which is measured during previous three cycles. These methods are simulated by PSIM 9.0, then experimental results from the fuel cell system prototype verify the validity of the proposed methods.
The Design of Interleaved Bi-directional DC-DC Converter for Fuel Cell and Battery Hybrid System
Kim, Seung-Min ; Choi, Ju-Yeop ; Choy, Ick ; Song, Seung-Ho ; Lee, Sang-Cheol ; Lee, Dong-Ha ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 45~53
DOI : 10.6113/TKPE.2013.18.1.45
Fuel cell power system is one of the most promising energy source for the alternative energy because it has unique advantages such as high energy density, no power drop during operation, and feasible to make compact size. However, due to very low response time, fuel cell is difficult to correspond to drastic load changes and start-up operation. For solving these problem, fuel cell power system must include energy storage device such as Li-Poly battery or super capacitor. Therefore, bi-directional DC-DC converter must be required for this storage device and fuel cell-PCS control. This paper presents a design and modeling of the bi-directional DC/DC converter. Firstly, we present modeling the boost and buck mode of the bi-directional converter through both PWM switch model and state space averaging technique. Secondly, in order to minimize output ripple and transient response overshoot, we have two identical DC-DC converters interleaved and adopt two-loop voltage-current controller. The proposed bi-directional DC-DC converter's modeling method and control design have been verified with computer simulation and experimentation.
High-Efficiency DC-DC Converter with Improved Dynamic Response Characteristics for Modular Photovoltaic Power Conversion
Choi, Jae-Yeon ; Choi, Woo-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 54~62
DOI : 10.6113/TKPE.2013.18.1.54
This paper proposes a high-efficiency DC-DC converter with improved dynamic response characteristics for modular photovoltaic power conversion. High power efficiency is achieved by reducing switching power losses of the DC-DC converter. The voltage stress of power switches is reduced at primary side. Zero-current switching of output diodes is achieved at secondary side. A modified proportional and integral controller is suggested to improve the dynamic responses of the DC-DC converter. The performance of the proposed converter is verified based on a 200 [W] modular power conversion system including the grid-tied DC-AC inverter. The proposed DC-DC converter achieves the efficiency of 97.9 % at 60 [V] input voltage for a 200 [W] output power. The overall system including DC-DC converter and DC-AC inverter achieves the efficiency of 93.0 % when 200 [W] power is supplied into the grid.
Optimized Design and Coordinated Control for Stand-alone DC Micro-grid
Han, Tae-Hee ; Lee, Ji-Heon ; Kim, Hyun-Jun ; Han, Byung-Moon ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 63~71
DOI : 10.6113/TKPE.2013.18.1.63
This paper describes the coordinated droop control method for stand-alone type DC micro-grid to improve reliability and utilization of distributed generations and energy storage. The stand-alone type DC micro-grid consists of several distributed generations such as a wind power generation, solar power and micro-turbine, and energy storage. The proposed method which is based on autonomous control method shows high reliability and stability through coordinated droop control of distributed generations and energy storage and also capability of battery management. The operation of stand-alone type DC micro-grid was analyzed using detail simulation model with PSCAD/EMTDC software. Based on simulation results, a hardware simulator was built and tested with commercially available components and performance of system was verified.
Design of Multilevel Variable Output Voltage AC-DC Converter for Power Amplifier of Underwater Acoustic Sensor
Lee, Chang-Yeol ; Kim, In-Dong ; Nho, Eui-Cheol ; Moon, Won-Kyu ; Kim, Won-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 72~83
DOI : 10.6113/TKPE.2013.18.1.72
The paper proposes a new multilevel variable output voltage AC/DC Converter for power supply of power amplifiers used in underwater acoustic sensors. The proposed multilevel variable output voltage AC/DC Converter is composed of two parts. One as the input section is the high efficiency phase-shifted PWM full bridge DC-DC converter to get multiport power sources. The other as the output section is composed of two flying-capacitor 3-level DC-DC converters and a diode bridge circuit to get fast-response and multilevel variable output voltage for an envelope amplifier. Also the paper suggests the detailed circuit topology and design guideline of multilevel variable output voltage AC/DC converter. It also proposes the power balanced control method between 3-level converters and the voltage balanced algorithm for flying capacitors. Its characteristics should be verified by the detailed simulation results. It is anticipated that the proposed converter will be used very well for power amplifiers used in underwater acoustic sensors.
Experiment of Single-phase Grid Connected Battery Charger
An, Hyun-Sung ; Lee, Wujong ; Mun, Byung-Ho ; Park, Il-Kyu ; Jung, Seon-Yong ; Kim, Youngroc ; Cha, Hanju ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 84~90
DOI : 10.6113/TKPE.2013.18.1.84
This paper explains control methods of single-phase grid connected battery charger. Charging mode is control by Constant Current - Constant Voltage method and discharging mode is controlled by active-reactive power control method. Current control method is based on the synchronous reference frame(SRF) PI controller, and the second harmonic of battery current is compensated by an added L-C resonant circuit. Feasibility of the proposed control methods is verified through experiment with a prototype of 5kW single-phase grid connected battery charger.
LCCT Z-Source DC-DC Converter with the Bipolar Output Voltages for Improving the Voltage Stress and Ripple
Park, Jong-Ki ; Shin, Yeon-Soo ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 91~102
DOI : 10.6113/TKPE.2013.18.1.91
This paper proposes the improved LCCT(Inductor-Capacitor-Capacitor-Trans) Z-source DC-DC converter (Improved LCCT ZSDC) which can generate the bipolar output voltages according to duty ratio D. The proposed converter has the characteristic and structure of Quasi Z-source DC-DC converter(Quasi ZSDC) and conventional LCCT Z-source DC-DC converter(LCCT ZSDC). To confirm the validity of the proposed method, PSIM simulation and a DSP based experiment were performed for each converter. In case which the input DC voltage is 70V, the bipolar output DC voltage of positive 90V and negative 50V could generate. Also, as comparison result of the capacitor voltage ripple in Z-network and the input current under the same condition for each converter, the voltage stress and the capacitor voltage in Z-network of the proposed method were lower compared with the conventional methods. Finally, the efficiency for each method was investigated according to load variation and duty ratio D.
Optimized LCL filter Design Method of Utility Interactive Inverter
Jung, Sang-Hyuk ; Choi, Se-Wan ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 103~109
DOI : 10.6113/TKPE.2013.18.1.103
The conventional LCL filter design method of the utility interactive inverter considers only harmonics attenuation of the current injected to the grid. However, in case of utility-interactive inverter with critical load the voltage quality of the critical load should also be considered for LCL filter design. Also, considering cost and volume of LCL filters. it is important to have minimum values of inductance and capacitance as far as the harmonic standards are satisfied. In this paper a LCL filter design method is proposed to satisfy not only the harmonic standards of the grid current during the grid-connected mode but the voltage quality of the critical load during grid-connected mode and stand-alone mode. With the proposed method optimized values of LCL filters could be obtained by applying weighting factor to voltage ripple across the critical load, inductor volume, amount of reactive current and system bandwidth.
Performance Improvement of B4 Inverters by Adding Compensation Voltage
Lee, Dong-Myung ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 1, 2013, Pages 110~116
DOI : 10.6113/TKPE.2013.18.1.110
This paper proposes a current ripple reduction method to improve the control performance of B4 type inverter that is studied for cost-effective drive systems. B4 inverters employ only four switches and they have a center-tapped connection between the split dc-link capacitors and one phase of a three-phase motor or load. In the B4 topology, unbalanced three-phase voltages will be generated due to the dc-link voltage ripple. To solve this problem, this paper presents a voltage distortion compensation method that adjusts the voltage reference with the consideration of dc-link voltage ripple. The validity of the proposed method is verified by simulation and excremental results with an induction machine.