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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Power Electronics
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Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 10, Issue 6 - Nov 2010
Volume 10, Issue 5 - Sep 2010
Volume 10, Issue 4 - Jul 2010
Volume 10, Issue 3 - May 2010
Volume 10, Issue 2 - Mar 2010
Volume 10, Issue 1 - Jan 2010
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Power Loss Analysis of Interleaved Soft Switching Boost Converter for Single-Phase PV-PCS
Kim, Jae-Hyung ; Jung, Yong-Chae ; Lee, Su-Won ; Lee, Tae-Won ; Won, Chung-Yuen ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 335~341
DOI : 10.6113/JPE.2010.10.4.335
In this paper, an interleaved soft switching boost converter for a Photovoltaic Power Conditioning System (PV-PCS) with high efficiency is proposed. In order to raise the efficiency of the proposed converter, a 2-phase interleaved boost converter integrated with soft switching cells is used. All of the switching devices in the proposed converter achieve zero current switching (ZCS) or zero voltage switching (ZVS). Thus, the proposed circuit has a high efficiency characteristic due to low switching losses. To analyze the power losses of the proposed converter, two experimental sets have been built. One consists of normal devices (MOSFETs, Fast Recovery (FR) diodes) and the other consists of advanced power devices (CoolMOSs, SiC-Schottky Barrier Diodes (SBDs)). To verify the validity of the proposed topology, theoretical analysis and experimental results are presented.
A Double-Hybrid Spread-Spectrum Technique for EMI Mitigation in DC-DC Switching Regulators
Dousoky, Gamal M. ; Shoyama, Masahito ; Ninomiya, Tamotsu ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 342~350
DOI : 10.6113/JPE.2010.10.4.342
Randomizing the switching frequency (RSF) to reduce the electromagnetic interference (EMI) of switching power converters is a well-known technique that has been previously discussed. The randomized pulse position (RPP) technique, in which the switching frequency is kept fixed while the pulse position (the delay from the starting of the switching cycle to the turn-on instant within the cycle) is randomized, has been previously addressed in the literature for the same purpose. This paper presents a double-hybrid technique (DHB) for EMI reduction in dc-dc switching regulators. The proposed technique employed both the RSF and the RPP techniques. To effectively spread the conducted-noise frequency spectrum and at the same time attain a satisfactory output voltage quality, two parameters (switching frequency and pulse position) were randomized, and a third parameter (the duty ratio) was controlled by a digital compensator. Implementation was achieved using field programmable gate array (FPGA) technology, which is increasingly being adopted in industrial electronic applications. To evaluate the contribution of the proposed DHB technique, investigations were carried out for each basic PWM, RPP, RSF, and DHB technique. Then a comparison was made of the performances achieved. The experimentally investigated features include the effect of each technique on the common-mode, differential-mode, and total conducted-noise characteristics, and their influence on the converter’s output ripple voltage.
A New Cost-Effective Current-Balancing Multi-Channel LED Driver for a Large Screen LCD Backlight Units
Hong, Sung-Soo ; Lee, Sang-Hyun ; Cho, Sang-Ho ; Roh, Chung-Wook ; Han, Sang-Kyoo ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 351~356
DOI : 10.6113/JPE.2010.10.4.351
A new current-balancing multi-channel LED driver is proposed in this paper. The conventional LED driver system consists of three cascaded power conversion stages and its driver stage has the same number of expensive boost converters as those of the LED channels. On the other hand, the proposed LED driver system consists of two cascaded power stages and its driver stage requires only passive devices instead of expensive boost converters. Nevertheless, all of the currents through multi-channel LEDs can be well balanced. Therefore, it features a smaller system size, improved efficiency, and lower cost. To confirm the validity of the proposed driver, its operation and performance are verified on a prototype for a 46" LCD TV.
Carrier Based Single-State PWM Technique for Minimizing Vector Errors in Multilevel Inverters
Nho, Nguyen Van ; Hai, Quach Thanh ; Lee, Hong-Hee ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 357~364
DOI : 10.6113/JPE.2010.10.4.357
In this paper, a novel analysis of a carrier based PWM method for multilevel inverters is presented. The space vector PWM and carrier based PWM correlations in multilevel inverters are investigated in a nominal two-level switching diagram. The obtained results can be applied to design various carrier PWM techniques. In this paper, a carrier based single-state PWM technique, which reduces the switching number and optimizes the active voltage errors, is presented. This PWM technique can be advantageous if there are a large number of levels. The proposed method is mathematically formulated and demonstrated by simulations and experimental results.
Analysis and Implementation of Multiphase Multilevel Hybrid Single Carrier Sinusoidal Modulation
Govindaraju, C. ; Baskaran, K. ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 365~373
DOI : 10.6113/JPE.2010.10.4.365
This paper proposes a hybrid single carrier sinusoidal modulation suitable for multiphase multilevel inverters. Multiphase multilevel inverters are controlled by hybrid modulation to provide multiphase variable voltage and a variable frequency supply. The proposed modulation combines the benefits of fundamental frequency modulation and single carrier sinusoidal modulation (SC-SPWM) strategies. The main characteristics of hybrid modulation are a reduction in switching losses and improved harmonic performance. The proposed algorithm can be applied to cascaded multilevel inverter topologies. It has low computational complexity and it is suitable for hardware implementations. SC-SPWM and its base modulation design are implemented on a TMS320F2407 digital signal processor (DSP). A Complex Programmable Logic Device realizes the hybrid PWM algorithm and it is integrated with a DSP processor for hybrid SC-SPWM generation. The feasibility of this hybrid modulation is verified by spectral analysis, power loss analysis, simulation and experimental results.
A Novel Pulse-Width and Amplitude Modulation (PWAM) Control Strategy for Power Converters
Ghoreishy, Hoda ; Varjani, Ali Yazdian ; Farhangi, Shahrokh ; Mohamadian, Mustafa ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 374~381
DOI : 10.6113/JPE.2010.10.4.374
Typical power electronic converters employ only pulse width modulation (PWM) to generate specific switching patterns. In this paper, a novel control strategy combining both pulse-width and amplitude modulation strategies (PWAM) has been proposed for power converters. The Pulse Amplitude Modulation (PAM), used in communication systems, has been applied to power electronic converters. This increases the degrees of freedom in eliminating or mitigating harmonics when compared to the conventional PWM strategies. The role of PAM in the novel PWAM strategy is based on the control of the converter's dc sources values. Software implementation of the conventional PWM and the PWAM control strategies has been applied to a five-level inverter for mitigating selective harmonics. Results show the superiority of the proposed strategy from the THD point of view along with a reduction in the inverter power dissipation.
Improvement in Control Performance of a Servo System Compensating Bandwidth Variations at Low Speed
Ji, Young-Eun ; Park, Je-Wook ; Hwang, Seon-Hwan ; Baek, Kwang-Ryul ; Kim, Jang-Mok ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 382~387
DOI : 10.6113/JPE.2010.10.4.382
This paper presents a novel design method for determining the PID gains of a speed controller for a servo system compensating variations in bandwidth at a low speed. The variations in bandwidth of a speed controller are measured at a low speed and the relationship between the bandwidth and the damping ratio are verified by determining the location of the closed loop pole. The proposed algorithm uses the z-transform of a plant and speed controller and applies the time-varying sampling method for determining the PID gains of the speed controller at low speed. The magnitude and the phase condition are considered for finding a suitable control gain. The usefulness and effectiveness of the proposed method is demonstrated through experimental results such as low speed control and robust disturbance responses.
Series-Parallel Connected Capacitor Type Boost Converter for a Single-Phase SRM
Lee, Dong-Hee ; Liang, Jiang ; Ahn, Jin-Woo ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 388~395
DOI : 10.6113/JPE.2010.10.4.388
An active boost converter for a single phase SRM using series-parallel connected capacitors is proposed in this paper. The proposed active boost converter has two diodes and one power switch with an anti-parallel diode and one additional boost capacitor. The additional boost capacitor could be series or parallel connected to the dc-link capacitor to produce proper excitation and demagnetization voltage. The proposed active boost converter can easily achieve a fast excitation and demagnetization from the capacitor connection. In this paper, series and parallel connected converters are reviewed, and the detailed operating modes as well as the voltage characteristics of the proposed converter are analyzed. The simulation and experimental results shows the effectiveness of the proposed active boost converter.
Simple Estimation Scheme for Initial Rotor Position and Inductances for Effective MTPA-Operation in Wind-Power Systems using an IPMSM
Kang, Yi-Kyu ; Jeong, Hea-Gwang ; Lee, Kyo-Beum ; Lee, Dong-Choon ; Kim, Jang-Mok ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 396~404
DOI : 10.6113/JPE.2010.10.4.396
This paper presents simple schemes used to estimate the initial rotor position and the d- and q-axis inductances for effective Maximum Torque per Ampere (MTPA) operation in a wind-power system using an IPMSM (Interior Permanent Magnet Synchronous Machine). An IPMSM essentially requires an exact coordinate transformation and accurate inductance values to use a reluctance torque caused by the saliency characteristic. In the proposed high-frequency voltage testing method, there is no voltage drop caused by the resistance and the electromotive force. The initial rotor position and the inductance can be measured through an analysis of the stator current without turning the rotor. The experimental results are presented in order to illustrate the feasibility of the proposed method.
Development of a Novel Tracking System for Photovoltaic Efficiency in Low Level Radiation
Choi, Jung-Sik ; Ko, Jae-Sub ; Chung, Dong-Hwa ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 405~411
DOI : 10.6113/JPE.2010.10.4.405
This paper proposes a novel tracking algorithm considering radiation to improve the power of a photovoltaic (PV) tracking system. The sensor method used in a conventional PV plant is unable to track the sun's exact position when the intensity of solar radiation is low. It also has the problem of malfunctions in the tracking system due to rapid changes in the climate. The program method generates power loss due to unnecessary operation of the tracking system because it is not adapted to various weather conditions. This tracking system does not increase the power above that of a power of tracking system fixed at a specific position due to these problems. To reduce the power loss, this paper proposes a novel control algorithm for a tracking system and proves the validity of the proposed control algorithm through a comparison with the conventional PV tracking method.
New Reference Generation for a Single-Phase Active Power Filter to Improve Steady State Performance
Lee, Ji-Heon ; Jeong, Jong-Kyou ; Han, Byung-Moon ; Bae, Byung-Yeol ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 412~418
DOI : 10.6113/JPE.2010.10.4.412
This paper proposes a new algorithm to generate a reference signal for an active power filter using a sliding-window FFT operation to improve the steady-state performance of the active power filter. In the proposed algorithm the sliding-window FFT operation is applied to the load current to generate the reference value for the compensating current. The magnitude and phase-angle for each order of harmonics are respectively averaged for 14 periods. Furthermore, the phase-angle delay for each order of harmonics passing through the controller is corrected in advance to improve the compensation performance. The steady-state and transient performance of the proposed algorithm was verified through computer simulations and experimental work with a hardware prototype. A single-phase active power filter with the proposed algorithm can offer a reduction in THD from 75% to 4% when it is applied to a non-linear load composed of a diode bridge and a RC circuit. The active power filter with the proposed reference generation method shows accurate harmonic compensation performance compared with previously developed methods, in which the THD of source current is higher than 5%.
Parallel Control of Shunt Active Power Filters in Capacity Proportion Frequency Allocation Mode
Zhang, Shuquan ; Dai, Ke ; Xie, Bin ; Kang, Yong ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 419~427
DOI : 10.6113/JPE.2010.10.4.419
A parallel control strategy in capacity proportion frequency allocation mode for shunt active power filters (APFs) is proposed to overcome some of the difficulties in high power applications. To improve the compensation accuracy and overall system stability, an improved selective harmonic current control based on multiple synchronous rotating reference coordinates is presented in a single APF unit, which approximately implements zero steady-state error compensation. The combined decoupling strategy is proposed and theoretically analyzed to simplify selective harmonic current control. Improved selective harmonic current control forms the basis for multi-APF parallel operation. Therefore, a parallel control strategy is proposed to realize a proper optimization so that the APFs with a larger capacity compensate more harmonic current and the ones with a smaller capacity compensate less harmonic current, which is very practical for accurate harmonic current compensation and stable grid operation in high power applications. This is verified by experimental results. The total harmonic distortion (THD) is reduced from 29% to 2.7% for a typical uncontrolled rectifier load with a resistor and an inductor in a laboratory platform.
Reduction of Input Current Harmonics for Three Phase PWM Converter Systems under a Distorted Utility Voltage
Park, Nae-Chun ; Mok, Hyung-Soo ; Kim, Sang-Hoon ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 428~433
DOI : 10.6113/JPE.2010.10.4.428
This paper proposes a harmonics reduction technique for the input currents of three phase PWM converters. The quality of the phase angle information on the utility voltage connected to the PWM converters affects their control performance. Under a distorted utility voltage, the extracted phase angle based on the synchronous reference frame PLL method is distorted. This causes large harmonics in the input currents of a PWM converter. In this paper, a harmonics reduction method that makes the input currents in the PWM converter sinusoidal even under distorted utility conditions is proposed. By the proposed method, without additional hardware, the THD (Total Harmonic Distortion) of the input currents can be readily limited to below 5% which is the harmonic current requirements of IEEE std. 519. Its validity is verified by simulations and experimental results.
A General Purpose Inverter Set-Up for Power Electronics Laboratory Experiments
Kayakesen, Mustafa Erman ; Cadirci, Isik ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 434~443
DOI : 10.6113/JPE.2010.10.4.434
A general purpose experimental set-up has been designed and implemented for students to carry out various experiments on inverters in the power electronics laboratories of universities, during a few hours of laboratory work. This is the first inverter setup that incorporates hardware and software control, as well as an optional user interface in a laboratory experimental set-up of a single multi-purpose inverter, thus making the system versatile and very practical for both undergraduate and graduate students. The system can be controlled either by a computer or through a liquid crystal display (LCD) and a keypad control unit, and it constitutes a low-cost alternative to relatively expensive commercial teaching sets. The computer provides a user friendly interface and easier control for laboratory environments equipped with computers. The LCD and keypad units eliminate the need for a computer, which makes this system usable in the laboratory as a standalone unit as well.
Design of a Microcontroller Based Electronic Load Controller for a Self Excited Induction Generator Supplying Single-Phase Loads
Gao, Sarsing ; Murthy, S. S. ; Bhuvaneswari, G. ; Gayathri, M. Sree Lalitha ;
Journal of Power Electronics, volume 10, issue 4, 2010, Pages 444~449
DOI : 10.6113/JPE.2010.10.4.444
The generation of electric power using self excited induction generation (SEIG) is a viable option in remote and rural areas where grid electricity is not available. The generated voltage and frequency of these machines, however, varies with varying loads. This characteristic can be resolved either by adjusting the values of the excitation capacitance or by controlling the prime mover speed. Further, in a single-point constant power application, where the machines deliver a fixed amount of power, the electronic load controller (ELC) can be used to switch-in or switch-out a dump load whenever the consumer load decreases or increases respectively. This paper presents a detailed analysis and the design of a microcontroller based SEIG -ELC system intended for stand-alone pico hydro power generation. The simulated performance of the controller is supplemented by experimental results.