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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 17, Issue 6 - Dec 2012
Volume 17, Issue 5 - Oct 2012
Volume 17, Issue 4 - Aug 2012
Volume 17, Issue 3 - Jun 2012
Volume 17, Issue 2 - Apr 2012
Volume 17, Issue 1 - Feb 2012
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A New Synthetic Test Circuit for Testing Thyristor Valve in HVDC Converter
Kim, Kyeong-Tae ; Han, Byung-Moon ; Jung, Jae-Hun ; Nho, Eui-Cheol ; Chung, Yong-Ho ; Baek, Seung-Taek ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 191~197
DOI : 10.6113/TKPE.2012.17.3.191
This paper proposes a new synthetic test circuit (STC) to confirm the switching operation of thyristor valve in HVDC converter. The proposed STC uses a 6-pulse thyristor converter with 2-phase chopper as a high-current source to provide turn-on current to the test valve. The operation of proposed STC was verified through theoretical analysis and computer simulations. Based on computer simulations, a hardware scaled model was built and tested to confirm the feasibility of implementing a real-size test facility. The proposed system has an advantage of simple structure and operation over the existing system.
Development of Three Phase 10kW Voltage Sag Compensator
Chae, Seung-Woo ; Cho, Hyun-Sik ; Lee, Il-Yong ; Kong, Se-Il ; Han, Byung-Moon ; Cha, Han-Ju ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 198~204
DOI : 10.6113/TKPE.2012.17.3.198
3-Phase voltage sag compensator protects a critical load from grid sags. The paper presents an algorithm and design of 3-phase voltage compensator. Compensator algorithm consists of a 3-phase voltage sag detection, thyrister commutation method and inverter output voltage control. The compensator satisfies SEMI F47 standard and 10kW 3-phase voltage sag compensator prototype is assembled. Validity of the proposed compensator is verified by simulation and experiment.
Variable Step-Size MPPT Control based on Fuzzy Logic for a Small Wind Power System
Choi, Dae-Keun ; Lee, Kyo-Beum ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 205~212
DOI : 10.6113/TKPE.2012.17.3.205
This paper proposes the fuzzy logic based variable step-size MPPT (Maximum Power Point Tracking) method for the stability at the steady state and the improvement of the transient response in the wind power system. If the change value of duty ratio is set on stability of the steady state, MPPT control traces to maximum power point slowly. And if the change value is set on improvement of the transient response, the system output oscillates at the maximum power point. By adjusting the step size with fuzzy logic, it can be improved the MPPT response speed and stability at steady state when MPPT control is performed to track the maximum power point. The effectiveness of the proposed method has been verified by simulations and experimental results.
Compensation Scheme for Dead Time and Inverter Nonlinearity Insensitive to IPMSM Parameter Variations
Park, Dong-Min ; Kim, Kyeong-Hwa ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 213~221
DOI : 10.6113/TKPE.2012.17.3.213
In a PWM inverter-fed IPMSM (Interior Permanent Magnet Synchronous Motor) drive, a dead time is inserted to prevent a breakdown of switching device caused by the short-circuit of DC link. This distorts the inverter output voltage resulting in a current distortion and torque ripple. In addition to the dead time, nonlinearity exists in switching devices of the PWM inverter, which is generally dependent on operating conditions such as the temperature, DC link voltage, and current. The voltage disturbance caused by the dead time and inverter nonlinearity directly influences on the inverter output performance, and it is known to be more severe at low speed. In this paper, a new compensation scheme for the dead time and inverter nonlinearity under the parameter variation is proposed for a PWM inverter-fed IPMSM drive. The overall system is implemented using DSP TMS320F28335 and the validity of the proposed algorithm is verified through the simulation and experiments.
A SOC Estimation using Kalman Filter for Lithium-Polymer Battery
Jang, Ki-Wook ; Chung, Gyo-Bum ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 222~229
DOI : 10.6113/TKPE.2012.17.3.222
The SOC estimation method based on Kalman Filter(KF) requires the accurate battery model to express the electrical characteristics of the battery. However, the performance of KF SOC estimator can hardly be improved because of the nonlinear characteristic of the battery. This paper proposes the new KF SOC estimator of Lithium-Polymer Battery(LiPB), which considers the variation of parameters based on the hysteresis effect, the magnitude of SOC, the charging/discharging mode and the on/off load conditions. The proposed SOC estimation method is verified with the PSIM simulation combined the experimental data of the LiPB.
Active-Clamp AC-DC Converter with Direct Power Conversion
Cho, Yong-Won ; Kwon, Bong-Hwan ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 230~237
DOI : 10.6113/TKPE.2012.17.3.230
This paper proposes an active-clamp ac-dc converter with direct power conversion that has a simple structure and achieves high efficiency. The proposed converter is derived by integrating the step-down ac chopper and the output-voltage doubler. The proposed converter provides direct ac-dc conversion and dc output voltage without using any full-bridge diode rectifier. The step-down ac chopper using an active-clamp mechanism serves to clamp the voltage spike across the main switches and provides zero-voltage turn-on switching. The resonant-current path formed by the leakage inductance of the transformer and the resonant capacitor of the output-voltage doubler achieves the zero-current turn-off switching of the output diodes. The operation principle of the converter is analyzed and verified. A 500W prototype is implemented to show the performance of the proposed converter. The prototype provides maximum efficiency of 95.1% at the full load.
A Sensorless Speed Control of 2-Phase Asymmetric SRM with Parameter Compensator
Lim, Geun-Min ; Ahn, Jin-Woo ; Lee, Dong-Hee ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 238~245
DOI : 10.6113/TKPE.2012.17.3.238
This paper presents a sensorless speed control of a 2-phase switch reluctance motor(SRM). The proposed sensorless control scheme is based on the slide mode observer with parameter compensator to improve the estimation performance. In the stand still position, the initial rotor position is determined by pulse current responses of each phase windings and the current difference. In order to determine an accurate initial rotor position, the two initial rotor positions are estimated by the difference of the pulse currents. From the stand still to the operating region, a simple open loop control which determines the commutation sequence by the pulse current of the unexcited phase winding is used. When the motor speed is reached to the sensorless control region, the estimated rotor position and speed by the slide mode observer are used to control the SRM. The flux calculator used in the slide mode observer is designed by phase voltage and the voltage drops in the phase resistance of the winding. The accuracy of the flux calculator is dependent on the phase resistance. For the continuous update of the phase resistance, current gradient at the inductance break point is used in this paper. The error of the estimated rotor position at the current gradient position is used to update the phase resistance to improve the sensorless scheme. The proposed sensorless speed control scheme is verified with a practical compressor used in home appliances. And the results show the effectiveness of the proposed control scheme.
Position Correction Method for Misaligned Hall-Effect Sensor of BLDC Motor using BACK-EMF Estimation
Park, Je-Wook ; Kim, Jong-Hoon ; Kim, Jang-Mok ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 246~251
DOI : 10.6113/TKPE.2012.17.3.246
This paper proposes a new position compensation method for misaligned Hall-effect sensors of BLDCM(Brushless DC Motor). If the Hall-effect sensors are installed at wrong position, the exact rotor position cannot be obtained. Therefore, when the BLDCM is controlled with this wrong position, the torque ripple can be increased and the average torque also decreases. The back-EMF of BLDCM can be obtained by using the voltage equation and by multiplying the back-EMF constant and rotor speed. At a constant speed, the estimated back-EMF by using the multiplication of the back-EMF constant and rotor speed is constant, but the estimated back-EMF from the voltage equation decreases at the commutation point because the line-to-line back-EMF of two conducting phases is start to decrease at this point. Therefore, by using the difference between these two estimated back-EMFs, the commutation point of the phase current can be determined and position compensation can be carried out. The proposed position correction method doesn't require additional hardware circuit and can be easily implemented. The validity of the proposed position compensation method is verified through several experiments.
Power Line Communication Method with Splitting of Power Transmission Interval
Cho, Jae-Seung ; Hwang, Il-Kyu ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 252~258
DOI : 10.6113/TKPE.2012.17.3.252
This paper studies the power line communication method with splitting of power transmission interval in the small DC power system using pulse width modulation. The method divides the entire interval for transmitting power and data into a power transmission interval where power is supplied to a load and a data transmission interval where power from the power supply to the load is disconnected. The circuit is designed for the implementation to separate the power line from the power supply and load. The results of tests show the feasibility of the proposed power line communication method.
Design and Implementation of a Current Controller for Boost Converters Using a DSP
Lee, Kwang-Woon ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 259~265
DOI : 10.6113/TKPE.2012.17.3.259
This paper introduces a method for design and implementation of a current controller for boost converter operating in continuous conduction mode (CCM) using a digital signal processor (DSP). A Proportional-Integral (PI) type current controller outputs an average voltage command for inductor, used in the input side of the boost converter, and the duty-ratio of PWM (pulse width modulation) signal for switching device is directly calculated from the average voltage command. The gains of the PI current controller are selected such that the current response characteristics are the same as those of a first-order low-pass filter. The proposed current control scheme is implemented using a DSP based on fixed-point math operations and an experimental study has been performed to validate the proposed method.
Switch Open Fault Detection and Tolerant Operation Method for Three Phase PWM Rectifier
Shin, Hee-Keun ; An, Byoung-Woong ; Kim, Hag-Wone ; Cho, Kwan-Yuhl ; Jung, Shin-Myung ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 266~273
DOI : 10.6113/TKPE.2012.17.3.266
In this paper, the new open fault detection and tolerant operation method for 3 phase PWM rectifier is proposed. When open fault occurred on the inverter switches of 3 Phase PWM rectifier, the DC link voltage ripple is increased because the input current of the faulty phase is distorted. In this case, the quality of electric power would decrease, and the life time of DC link capacitor is decreased. The open fault is detected by a simple MRAS(Model Reference Adaptive System) without additional hardware sensors, and the tolerant operation carried out by turning on the opposite switch of the faulty switch without any redundancy. By the proposed method, the faulty phase input current can be controlled, so that 3-phase input current is balanced relatively under the faulty condition and the voltage ripple of DC link output is reduced. The validity of the proposed technique is proved on the 6kW 3-phase PWM rectifier system by simulation and experiment.
Comparison of Current Controllers of Grid-connected PCS for Distributed Resources
Park, Jong-Hyoung ; Jo, Teak-Hyun ; Kim, Heung-Geun ; Chun, Tae-Won ; Nho, Eui-Cheol ; Cha, Hon-Nyung ;
The Transactions of the Korean Institute of Power Electronics, volume 17, issue 3, 2012, Pages 274~280
DOI : 10.6113/TKPE.2012.17.3.274
In this paper, three current controllers for a grid-connected PCS using an LCL filter are compared and analyzed. Current controllers discussed in this paper are linear controllers such as PI (proportional-integral), PR (proportional-resonant), and DB (deadbeat) controller. Both transient and steady state responses of each controller are compared through both simulation and experiment. Although the DB controller has the fastest transient response and the lowest THD in the steady state, the DB controller has two cycles delay of current response in the steady state and has the stability problem which can be occurred due to variation of the system parameters. On the one hand the responses of PR controller are not much different from that of DB controller but the other hand that are not only strong to noise of grid current but also have smaller THD than PI controller. Considering the response time and stability issue of three controllers, the PR controller has the best performance among three controllers and thus can be strongly recommended as a current controller for a grid-connected PCS.