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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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The Modified Control Method of Boost Converter for PV System in DCM
Lee, Young-Jin ; Han, Dong-Hwa ; Byen, Byeong-Joo ; Choi, Jung-Muk ; Bayasgalan, Dugarjav ; Choe, Gyu-Ha ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 297~304
DOI : 10.6113/TKPE.2013.18.4.297
This paper presents a improved control technique to overcome disadvantage when the inductor current of boost converter in PV system becomes DCM(Discontinuous Conduction Mode) due to the low insolation. MPPT(Maximum Power Point Tracking) output reference voltage could not be exactly followed by conventional dual-loop PI control method used typically because of the error between the actual current and measured current. Therefore, in this paper, Hybrid controller that changes the control method in DCM and CCM(Continuous Conduction Mode), and single state feedback controller are used to compensate that problem. The proposed control technique was verified by simulation using PSIM 9.0 and experiments.
Enhanced Voltage Gain Single-Phase Current-Fed qZ-Source Inverter
Shin, Hyun-Hak ; Cha, Hon-Nyong ; Kim, Heung-Geun ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 305~311
DOI : 10.6113/TKPE.2013.18.4.305
This paper proposes a performance improvement of existing single-phase current-fed qZ-Source inverter. Voltage gain of the traditional voltage-fed full-bridge inverter and single-phase current-fed qZ-source inverter is only equal to or smaller than input voltage. The proposed inverter can obtain twice higher voltage gain than the single-phase current-fed qZ-Source inverter by adding an extra switch and a capacitor in the circuit. In addition, the proposed inverter shares the common ground between dc input and ac output voltage. Therefore, the proposed inverter can eliminate the possible ground leakage current problem when it is used for grid-tied photovoltaic inverter system. A 120 W prototype inverter is built and tested to verify performances of the proposed inverter.
Soft Switching Control Method for Photovoltaic AC Module Flyback Inverter using Synchronous Rectifier
Jang, Jin-Woo ; Kim, Young-Ho ; Choi, Bong-Yeon ; Jung, Yong-Chae ; Won, Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 312~321
DOI : 10.6113/TKPE.2013.18.4.312
In this paper, high efficiency control method for flyback inverter with synchronous rectifier(SR) based on photovoltaic AC modules is proposed. In this control method, the operation of SR is classified according to the voltage spike across main switch SP. When the voltage spike across SP is lower than the rating voltage of SP, the operation of active clamp circuit is interrupted for reducing the switching loss of auxiliary switch. In this time, the SR is operated for soft-switching of SP. When the voltage spike across Sp is higher than the rating voltage of SP, the operation of active circuit is activated for reducing the voltage spike. The SR is operated for reducing the conduction loss of secondary output diode. Thus, a switching loss of the main switch can be reduced in low power region, and weighted-efficiency can be improved. A theoretical analysis and the design principle of the proposed method are provided. And validity is confirmed through simulation and experimental results.
Single-Phase Series Type Quasi Z-Source Voltage Sag-Swell Compensator for Voltage Compensation of Entire Region
Eom, Jun-Hyun ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 322~332
DOI : 10.6113/TKPE.2013.18.4.322
Conventional single-phase series quasi Z-source voltage compensator can not compensate for voltage sag less than 50% that frequently occurs in the industrial field. In this study, single-phase series quasi Z-source voltage sag-swell compensator which can compensate the voltage variation of entire range is proposed. The proposed system is composed of two quasi Z-source AC-AC converters connected in series with output terminal stage. Voltage sag less than 50% could be compensated by the intersection switching control of the upper converter duty ratio and of the upper converter duty ratio. Also the compensation voltage and its flowchart for each compensation mode are presented for entire sag-swell region. To confirm the validity of the proposed system, a DSP(DSP28335) controlled experimental system was manufactured. As a result, the proposed system could compensate for the voltage sag/swell of 20% and 60%. Finally, voltage compensation factor and THD(Total Harmonic Distortion) according to voltage variation and load change were measured, and voltage quality shows a good results.
Advanced Control of Three-Phase Four-Wire Inverters using Feedback Linearization under Unbalanced and Nonlinear Load Conditions
Vo, Nguyen Qui Tu ; Lee, Dong-Choon ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 333~341
DOI : 10.6113/TKPE.2013.18.4.333
In this paper, a feedback linearization control is proposed to regulate the output voltages of a three-phase four-wire inverter under the unbalanced and nonlinear load conditions. First, the nonlinear model of system including the output LC filters is derived in the d-q-0 synchronous reference frame. Then, the system is linearized by the multi-input multi-output feedback linearization. The tracking controllers for d-q-0-components of three-phase line-to-neutral load voltages are designed by linear control theory. The experimental results have shown that the proposed control method gives the good performance in response to the load conditions.
An Improved Non-Isolated 3-Level High Step-Up Boost Converter
Kim, Su-Han ; Cha, Hon-Nyong ; Kim, Heung-Geun ; Choi, Byung-Cho ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 342~348
DOI : 10.6113/TKPE.2013.18.4.342
In this paper, an improved non-isolated 3-level high step-up boost converter is proposed. By using the well known duality principle, the proposed converter is derived from two-phase buck converter. Compared with the traditional boost converter and 3-level boost converter, the proposed converter can obtain very high voltage conversion ratio and the voltage stress of switching devices and diodes is only 1/4 of the output voltage. A 1 kW prototype converter is built and tested to verify performances of the proposed converter.
A Sensorless MPPT Control Using an Adaptive Neuro-Fuzzy Logic for PV Battery Chargers
Kim, Jung-Hyun ; Kim, Gwang-Seob ; Lee, Kyo-Beum ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 349~358
DOI : 10.6113/TKPE.2013.18.4.349
In this paper, the sensorless MPPT algorithm is proposed where the performance of varied duty ratio change has been improved using multi-layer neuro-fuzzy that aligns with neuro-fuzzy based optimized membership function. Since the change of duty ratio of sensorless MPPT is varied by using the neuro-fuzzy, the MPPT response speed is faster than the convectional method and is able to reduce the steady-state ripple. The neuro fuzzy controller has the response characteristics which is superior to the existing fuzzy controller, because of the usage of the optimal width of the fuzzy membership function. The effectiveness of the proposed method has been verified by simulations and experimental results.
A Zero-Current-Transition Synchronous Buck Converter Using Auxiliary Circuit with Soft-Switching
Lee, Eui-Cheon ; Choi, Hyun-Chil ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 359~366
DOI : 10.6113/TKPE.2013.18.4.359
This paper proposes a zero-current-transition(ZCT) synchronous buck converter using auxiliary circuit with soft-switching for light weight and high efficiency. In this scheme, an auxiliary circuit is added to the conventional synchronous rectifier buck converter and used to achieve soft-switching condition for both the main switch and synchronous switch. In addition, the switch in the auxiliary circuit operates under soft-switching conditions. Thus, the proposed converter provides a higher efficiency. The basic operations, in this paper, are discussed and design guidelines are presented. The usefulness of the proposed converter is verified on a 200KHz, 20 W prototype converter.
Torque Ripple Reduction based on Flux Linkage Harmonics Observer for an Interior PM Synchronous Motor including Back EMF Harmonics
Jin, Yong-Sin ; Kim, Hag-Wone ; Cho, Kwan-Yuhl ; Lim, Byung-Kuk ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 367~375
DOI : 10.6113/TKPE.2013.18.4.367
The mechanical vibration of a PM synchronous motor at low speeds due to the back emf harmonics may be serious problems in some application such as MDPS(Motor driven power steering), electric vehicles. In this paper, torque ripple reduction for an interior PM synchronous motor including back emf harmonics is proposed. The dq flux linkage harmonics of the permanent magnet are estimated on real time by using the dq currents of the real system and the model of the MRAS observer. Based on the estimated flux linkage harmonics, the dq harmonic currents for reducing the torque ripples are compensated on the dq reference currents. The estimation of the flux linkage harmonics by the MRAS observer and the torque ripple reduction of the proposed algorithm was verified by the simulation and experiment.
Design of the Unmanned Solar Vehicle with Quick Response of Maximum Power Point Tracking
Shin, Yesl ; Lee, Kyo-Beum ; Jeon, Yong-Ho ; Song, Bong-Sob ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 376~386
DOI : 10.6113/TKPE.2013.18.4.376
This paper proposes an improved Maximum Power Point Tracking method and design methods of unmanned solar vehicle system by parts of hardware, unmanned driving control and power conversion. The hardware design is offered on the weight reduction and structural reliability by using structural analysis software. The technique of curve fitting is applied to unmanned control system due to minimizing the vehicle's behavior. Furthermore, lateral controller applying actuator dynamics is robust enough to prevent performance degradation by measurement noise regarding position and heading angle. The power conversion system contains battery charger system and tapped-inductor boost converter. In the battery charger system, variable step-size MPPT is conducted for quick response of maximum power point tracking. The validity of the proposed algorithm are verified by simulations and experiments.
Droop Control for Parallel Inverers in Islanded Microgrid Considering Unbalanced Low-Voltage Line Impedances
Lim, Kyung-Bae ; Choi, Jaeho ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 387~396
DOI : 10.6113/TKPE.2013.18.4.387
This paper investigates the droop control of parallel inverters for an islanded mode of microgrid. Frequency and voltage droop control is one of power control and load demand sharing methods. However, although the active power is properly shared, the reactive power sharing is inaccurate with conventional method due to the unequal line impedances and the power coupling of active - reactive power. In order to solve this problem, an improved droop method with virtual inductor concept and a voltage and current controller properly designed have been considered and analyzed through the PSiM simulation. The performance of improved droop method is analyzed in not only low-voltage line but also medium voltage line.
The Design of Long-life and High-efficiency Passive LED Drivers using LC Parallel Resonance
Lee, Eun-Soo ; Choi, Bo-Hwan ; Cheon, Jun-Pil ; Kim, Bong-Cheol ; Rim, Chun-Taek ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 397~402
DOI : 10.6113/TKPE.2013.18.4.397
This paper proposes a new passive type LED driver which satisfies the standard of power factor (PF) and total harmonic distortion (THD). The proposed passive LED driver also has high-efficiency and long-life time characteristics compared to active LED driver which is composed of op-amp, switches and so on. By using just passive components such as inductor, capacitor, and diode, it has resolved extremely short-life time and low-efficiency problems of previous LED drivers. It has achieved PF of 0.99, THD of 16.4 %, and the total efficiency of 95 %. The proposed passive LED driver is fully analyzed and verified by simulations and experiments, which results are in good agreement each other.
A Bidirectional Three-phase Push-pull Zero-Voltage Switching DC-DC Converter
Kwon, Min-Ho ; Han, Kook-In ; Park, Jung-Sung ; Choi, Se-Wan ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 4, 2013, Pages 403~411
DOI : 10.6113/TKPE.2013.18.4.403
This paper proposes an isolated bidirectional three-phase push-pull dc-dc converter for high power application such as eco-friendly vehicles, renewable energy systems, energy storage systems, and solid-state transformers. The proposed converter achieves ZVS turn-on of all switches and volume of passive components is small by an effect of three-phase interleaving. The proposed converter has identical switching pattern for both boost and buck mode, and therefore can provide seamless characteristic at the mode transition. A 3kW prototype of the proposed converter has been built and tested to verify the validity of the proposed operation.