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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
Selecting the target year
An Active Feedforward Compensation for a Current Harmonics Reduction in Three-phase Grid-connected Inverters
Park, Byong-Jun ; Kim, Rae-Young ; Choi, Ki-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 1~7
DOI : 10.6113/TKPE.2014.19.1.1
This paper proposes a current harmonic compensation method for the grid-connected inverter, especially caused by the grid impedance. Grid impedance causes low order harmonics in the grid current and deteriorates power quality. This paper analyzes the negative impact of the grid impedance, and proposes an active feedforward compensation method. Proposing method verified through simulation and experiment with 3-phase 1.5kW voltage source inverter prototype.
A Study on Characteristics Analysis of Winding Method for Common-Mode Choke
Won, Jae-Sun ; Kim, Hee-Seung ; Kim, Jong-Hae ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 8~14
DOI : 10.6113/TKPE.2014.19.1.8
This paper presents the intra capacitance modeling according to the winding method and section bobbin for CM choke capable of the EMI attenuation of broad bands from lower frequency bands to higher frequency bands and high frequency type common-mode choke capable of the EMI attenuation of high frequency band used in the EMI Block of LED-TV SMPS. In case of high frequency type CM choke, it can be explained the parasitic capacitance of A type and section bobbin type winding methods among them is much smaller than the other. The first resonant frequency of the proposed CM choke tends to increase as the parasitic capacitance becomes small and its impedance characteristics also show improved performance as the first resonant frequency increases. In the future, the CM chokes of high frequency type show it can be practically used in not only LED/LCD-TV SMPS but also several applications such as LED Lighting, Adapter and so on.
Parallel Operation of Three-Phase Bi-Directional Isolated Interleaved DC-DC Converters for The Battery Charge/Discharge System
Jo, Hyunsik ; Lee, Jaedo ; Cha, Hanju ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 15~22
DOI : 10.6113/TKPE.2014.19.1.15
Recently, parallel operation of dc-dc converters has been widely used in distributed power systems. In this paper, a control method to achieve parallel operation of three-phase bi-directional isolated interleaved dc-dc converters is discussed for the battery charging and discharging system which consists of the 32 battery charger/dischargers and two three-phase bi-directional isolated interleaved dc-dc converters. In the boost mode, the battery energy is delivered to the grid, whereas the grid energy is transferred to the battery in the buck mode operation. The average current sharing control method is employed to obtain an equal conducting of each phase current in the three-phase dc-dc converter. By using the proposed method, the imbalance factor is gratefully reduced from 8 percent to 1 percent. Two 2.5kW three-phase bi-directional dc-dc converter prototype have been built and the proposed method has been verified through experiments.
Single Power-conversion AC-DC Converter with High Power Factor
Cho, Yong-Won ; Park, Chun-Yoon ; Kwon, Bong-Hwan ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 23~30
DOI : 10.6113/TKPE.2014.19.1.23
This paper proposes a single power-conversion ac-dc converter with a dc-link capacitor-less and high power factor. The proposed converter is derived by integrating a full-bridge diode rectifier and a series-resonant active-clamp dc-dc converter. To obtain a high power factor without a power factor correction circuit, this paper proposes a suitable control algorithm for the proposed converter. The proposed converter provides single power-conversion by using the proposed control algorithm for both power factor correction and output control. Also, the active-clamp circuit clamps the surge voltage of switches and recycles the energy stored in the leakage inductance of the transformer. Moreover, it provides zero-voltage turn-on switching of the switches. Also, a series-resonant circuit of the output-voltage doubler removes the reverse-recovery problem of the output diodes. The proposed converter provides maximum power factor of 0.995 and maximum efficiency of 95.1% at the full-load. The operation principle of the converter is analyzed and verified. Experimental results for a 400W ac-dc converter at a constant switching frequency of 50kHz are obtained to show the performance of the proposed converter.
Suppression of Common-Mode Voltage in a Multi-Central Large-Scale PV Generation Systems for Medium-Voltage Grid Connection
Bae, Young-Sang ; Kim, Rae-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 31~40
DOI : 10.6113/TKPE.2014.19.1.31
This paper describes an optimal configuration for multi-central inverters in a medium-voltage (MV) grid, which is suitable for large-scale photovoltaic (PV) power plants. We theoretically analyze a proposed common-mode equivalent model for problems associated with multi-central transformerless-type three-phase full bridge(3-FB) PV inverters employing two-winding MV transformers. We propose a synchronized PWM control strategy to effectively reduce the common-mode voltages that may simultaneously occur. In addition, we propose that the existing 3-FB topology may also have the configuration of a multi-central inverter with a two-winding MV transformer by making a simple circuit modification. Simulation and experimental results of three 350kW PV inverters in a multi-central configuration verify the effectiveness of the proposed synchronization control strategy. The modified transformerless-type 3-FB topology for a multi-central PV inverter configuration is verified using an experimental prototype of a 100kW PV inverter.
Control Strategy for a Grid Stabilization of a Large Scale PV Generation System based on German Grid Code
Bae, Young-Sang ; Kim, Rae-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 41~50
DOI : 10.6113/TKPE.2014.19.1.41
The rising penetration of renewable energy resulted in the development of grid-connected large-scale power plants. Therefore, grid stabilization, which depends on the system-type or grid of each country, plays an important role and has been strengthened by different grid codes. With this background, VDE-AR-N 4105 for photovoltaic (PV) systems connected to the low-voltage grid and the German Association of Energy and Water Industries (BDEW) introduced the medium-voltage grid code for connecting power plants to the grid and they are the most stringent certifications. In this paper, an optimal control strategy scheme for three-phase grid-connected PV system is enhanced with VDE-AR-N 4105 and BDEW grid code, where both active/reactive powers are controlled. Simulation and experimental results of 100kW PV inverter are shown to verify the effectiveness of the proposed implemental control strategy.
Mathematical Consideration on PV Cell Modeling
Park, Hyeonah ; Kim, Hyosung ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 51~56
DOI : 10.6113/TKPE.2014.19.1.51
PV cell modeling is necessary both for software and hardware simulators in analyzing and testing the performance of PV generation systems. Unique I-V curve of a PV cell identifies its own characteristics by electrical equivalent model that is composed of diode constants (
), photo-generated current (
), series resistance (
), and shunt resistance (
). Photo-generated current can be easily estimated since it is proportional to irradiation level. However, other electrical parameters should be solved from the manufacturer's data sheet that is consisted with three remarkable operating points such as open circuit voltage (
), short circuit current (
), and maximum power voltage/current (
). This paper explains and analyzes mathematical process of a novel PV cell modeling algorithm that was proposed by the authors with the name of "K-algorithm".
Development of 12V, 1000A Isolated Bidirectional Resonant DC-DC Converter
Park, Jun-Sung ; Choi, Se-Wan ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 57~63
DOI : 10.6113/TKPE.2014.19.1.57
In this paper a bidirectional DC-DC converter is proposed for renewable energy systems, eco-friendly vehicles, energy storage systems, uninterruptible power supply(UPS) systems and battery test equipments. The two-stage bidirectional converter employing a fixed-frequency series loaded resonant converter is designed to be capable of operating under zero-current-switching turn on and turn off regardless of voltage and load variation, and hence its magnetic components and EMI filters can be optimized. And efficiencies and volumes of the two-stage bidirectional converters are compared according to configuration of isolated and non-isolated parts and a two-stage topology suitable for low voltage and high current applications is proposed. A 12kW(12V, 1000A) prototype of the proposed converter has been built and tested to verify the validity of the proposed operation.
A Study on LLCL Filter to Reduce Harmonic Current of Grid Connected Power Inverter
An, Byoung-Woong ; Hong, Chang-Pyo ; Kim, Hag-Wone ; Cho, Kwan-Yuhl ; Lim, Byung-Kuk ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 64~70
DOI : 10.6113/TKPE.2014.19.1.64
In this paper, the new LLCL filter is proposed for grid connected three-phase PWM inverter for passive damping. LLCL filter inserts a small inductor in the branch of the capacitor of the traditional LCL filter to compose a series resonant circuit to reduce the switching-frequency component on grid current. Using LLCL filter, the switching-frequency current ripple components can be attenuated much better than the LCL filter, leading to a decrease in the total inductance. However, the resonance phenomena caused by zero impedance from the addition of LC branch in LLCL filter can be a big problem. Resonance phenomena of LLCL filter can be a source of grid system instability, so proper damping methods are required. However, it is difficult to apply a passive damping method in the conventional LLCL filter, because the damping resistor increase impedance of the LC branch. Therefore, switching frequency component of grid current can not much attenuated by low Q of LC series resonance effect. In this paper, a new LLCL filter is proposed to overcome the conventional LLCL filter with passive damping. The validity of the proposed method is proven by simulation and experimental result.
Input Voltage Sensorless Control for 3 Phase Vienna Rectifier
Lee, Sang-Ri ; Kim, Hag-Wone ; Cho, Kwan-Yuhl ; Hwang, Soon-Sang ; Yoon, Byung-Chul ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 71~79
DOI : 10.6113/TKPE.2014.19.1.71
In this paper, a new grid voltage estimation algorithm without voltage sensors is proposed for the three-phase vienna rectifier. Generally, input voltage sensor circuits increase size and cost of the PWM rectifier In order to reduce the cost and size and in order to increase reliability from the electrical noise, grid voltage estimation scheme without input voltage sensor is highly required. In this paper, the grid voltage estimation algorithm is proposed by a simple MRAS(Model Reference Adaptive System) observer without input voltage sensors. The validity of the proposed method is proven by simulation and experiment on the three-phase vienna rectifier system.
Loss Analysis of Power Conversion Equipment for Efficiency Improvement
Kim, Min-Kook ; Woo, Dong-Gyun ; Lee, Byoung-Kuk ; Kim, Nam-Jun ; Kim, Jong-Soo ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 80~90
DOI : 10.6113/TKPE.2014.19.1.80
This paper suggests loss analysis and calculation methods for efficiency improvement of power conversion equipment in detail. The detailed loss analysis and calculation has been conducted for 3.3kW On-board Battery Charger considering temperature condition. The validity of the analysis and calculation method is verified by simulation model.
Power Factor Correction LED Driver with Small 120Hz Current Ripple
Sakong, Suk-Chin ; Park, Hyun-Seo ; Kang, Jeong-Il ; Han, Sang-Kyoo ;
The Transactions of the Korean Institute of Power Electronics, volume 19, issue 1, 2014, Pages 91~97
DOI : 10.6113/TKPE.2014.19.1.91
Recently, the LED(Light Emitting Diode) is expected to replace conventional lamps including incandescent, halogen and fluorescent lamps for some general illumination application, due to some obvious features such as high luminous efficiency, safety, long life, environment-friendly characteristics and so on. To drive the LED, a single stage PFC(Power Factor Correction) flyback converter has been adopted to satisfy the isolation, PFC and low cost. The conventional flyback LED driver has the serious disadvantage of high 120Hz output current ripple caused by the PFC operation. To overcome this drawback, a new PFC flyback with low 120Hz output current ripple is proposed in this paper. It is composed of 2 power stages, the DCM(Discontinuous Conduction Mode) flyback converter for PFC and BCM(Boundary Conduction Mode) boost converter for tightly regulated LED current. Since the link capacitor is located in the secondary side, its voltage stress is small. Moreover, since the driver is composed of 2 power stages, small output filter and link capacitor can be used. Especially, since the flyback is operated at DCM, the PFC can be automatically obtained and thus, an additional PFC IC is not necessary. Therefore, only one control IC for BCM boost converter is required. To confirm the validity of the proposed converter, theoretical analysis and experimental results from a prototype of 24W LED driver are presented.