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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Power Electronics
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
Editor in Chief :
Volume & Issues
Volume 12, Issue 6 - Nov 2012
Volume 12, Issue 5 - Sep 2012
Volume 12, Issue 4 - Jul 2012
Volume 12, Issue 3 - May 2012
Volume 12, Issue 2 - Mar 2012
Volume 12, Issue 1 - Jan 2012
Selecting the target year
Implementation of an Interleaved AC/DC Converter with a High Power Factor
Lin, Bor-Ren ; Lin, Li-An ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 377~386
DOI : 10.6113/JPE.2012.12.3.377
An interleaved bridgeless buck-boost AC/DC converter is presented in this paper to achieve the characteristics of low conduction loss, a high power factor and low harmonic and ripple currents. There are only two power semiconductors in the line current path instead of the three power semiconductors in a conventional boost AC/DC converter. A buck-boost converter operated in the boundary conduction mode (BCM) is adopted to control the active switches to achieve the following characteristics: no diode reverse recovery problem, zero current switching (ZCS) turn-off of the rectifier diodes, ZCS turn-on of the power switches, and a low DC bus voltage to reduce the voltage stress of the MOSFETs in the second DC/DC converter. Interleaved pulse-width modulation (PWM) is used to control the switches such that the input and output ripple currents are reduced such that the output capacitance can be reduced. The voltage doubler topology is adopted to double the output voltage in order to extend the useable energy of the capacitor when the line voltage is off. The circuit configuration, principle operation, system analysis, and a design example are discussed and presented in detail. Finally, experiments on a 500W prototype are provided to demonstrate the performance of the proposed converter.
Design and Development of a High-Voltage Transformer-less Power Supply for Ozone Generators Based on a Voltage-fed Full Bridge Resonant Inverter
Amjad, Muhammad ; Salam, Zainal ; Facta, Mochammad ; Ishaque, Kashif ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 387~398
DOI : 10.6113/JPE.2012.12.3.387
It is known that transformer based power supplies for ozone generators have low efficiency, high cost and exhibits a limited frequency range of operation. To overcome these disadvantages, this paper proposes a high frequency ozone generator with the absence of a transformer. The voltage step-up is achieved only by utilizing the resonant tank. This is made possible by a novel combination of ozone chamber materials that allow ozone to be generated at only 1.5 - 3.5
. The input to the resonant tank is driven by a PWM full bridge resonant inverter. Furthermore, zero-current zero-voltage switching (ZCZVS) operation is achieved by employing a duty factor of 25% between the switches of the full bridge. The advantages of the proposed system include high efficiency, low cost and the ability to control ozone production by varying the input voltage to the inverter. The prototype is verified by both simulation and experimental results.
Analysis of Parameter Effects on the Small-Signal Dynamics of Buck Converters with Average Current Mode Control
Li, Ruqi ; O`Brien, Tony ; Lee, John ; Beecroft, John ; Hwang, Kenny ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 399~409
DOI : 10.6113/JPE.2012.12.3.399
In DC-DC Buck converters with average current mode control, the current loop compensator provides additional design freedom to enhance the converter current loop performance. On the other hand, the current loop circuit elements append substantial amount of complexity to not only the inner current loop but also the outer voltage loop, which makes it demanding to quantify circuit and operating parameter effects on the small-signal dynamics of such converters. Despite the difficulty, it is shown in this paper that parameter effects can be analyzed satisfactorily by using an existing small-signal model in conjunction with a newly proposed simplified alternative. As a result of the study, new insight into average current mode control is uncovered and discussed quantitatively. Measurable experimental results on a prototype averaged-current-mode-controlled Buck converter are provided to facilitate the analytical study with good correlation.
Direct Current Control Method Based On One Cycle Controller for Double-Frequency Buck Converters
Luo, Quanming ; Zhi, Shubo ; Lu, Weiguo ; Zhou, Luowei ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 410~417
DOI : 10.6113/JPE.2012.12.3.410
In this paper, a direct current control method based on a one-cycle controller (DCOCC) for double frequency buck converters (DF buck) is proposed. This control method can make the average current through the high frequency and low frequency inductors of a DF buck converter equal. This is similar to the average current control method. However, the design of the loop compensator is much easier when compared with the average current control. Since the average current though the high frequency and low frequency inductors is equivalent, the current stress of the high frequency switches and the switch losses are minimized. Therefore, the efficiency of the DF buck converter is improved. Firstly, the operation principle of DCOCC is described, then the small signal models of a one cycle controller and a DF buck converter are presented based on the state space average method. Eventually, a system block diagram of the DCOCC controlled DF buck is established and the compensator is designed. Finally, simulation and experiment results are given to verify the correction of the theory analysis.
Improving the Overall Efficiency for DC/DC Converter with LoV-HiC System
Han, Dong-Hwa ; Lee, Young-Jin ; Kwon, Wan-Sung ; Bou-Rabee, Mohammed A. ; Choe, Gyu-Ha ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 418~428
DOI : 10.6113/JPE.2012.12.3.418
It is very important to improve the overall efficiency of systems with a source of power that has low-voltage high-current terminal characteristics such as fuel cells. A resonant converter is required for high efficiency systems. However, the peak value of the switches current is large in a resonant converter. This peak current requires a large number of switches and results in system failures. In this paper, an analysis and experiments of a resonant isolation push-pull converter are performed. A switching loss analysis is performed in order to compare losses between a resonant push pull converter and a hard switching push-pull converter. Specially, the conduction loss is studied based on the ratio between the resonant frequency and the switching frequency. In addition, a method for improving the efficiency is implemented with conventional HF insolation converters.
Single-Stage High-Power-Factor Electronic Ballast with a Symmetrical Class-DE Resonant Rectifier
Ekkaravarodome, Chainarin ; Jirasereeamornkul, Kamon ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 429~438
DOI : 10.6113/JPE.2012.12.3.429
This paper presents the use of a novel, single-stage high-power-factor electronic ballast with a symmetrical class-DE low-
resonant rectifier as a power-factor corrector for fluorescent lamps. The power-factor correction is achieved by using a bridge rectifier to utilize the function of a symmetrical class-DE resonant rectifier. By employing this topology, the peak and ripple values of the input current are reduced, allowing for a reduced filter inductor volume of the EMI filter. Since the conduction angle of the bridge rectifier diode current was increased, a low-line current harmonic and a power factor near unity can be obtained. A prototype ballast, operating at an 84-kHz fixed frequency and a 220-
, 50-Hz line input voltage, was utilized to drive a T8-36W fluorescent lamp. Experimental results are presented which verify the theoretical analysis.
Input-Series Multiple-Output Auxiliary Power Supply Scheme Based on Transformer-Integration for High-Input-Voltage Applications
Meng, Tao ; Ben, Hongqi ; Wei, Guo ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 439~447
DOI : 10.6113/JPE.2012.12.3.439
In this paper, an input-series auxiliary power supply scheme is proposed, which is suitable for high input voltage and multiple-output applications. The power supply scheme is based on a two-transistor forward topology, all of the series modules have a common duty ratio, all the switches are turned on and off simultaneously, and the whole circuit has a single power transformer. It does not require an additional controller but still achieves efficient input voltage sharing (IVS) for each series module through its inherent transformer-integration strategy. The IVS process of this power supply scheme is analyzed in detail and the design considerations for the related parameters are given. Finally, a 100W multiple-output auxiliary power supply prototype is built, and the experimental results verify the feasibility of the proposed scheme and the validity of the theoretical analysis.
A Carrier-Based Pulse Width Modulation Method for Indirect Matrix Converters
Nguyen, Dinh-Tuyen ; Lee, Hong-Hee ; Chun, Tae-Won ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 448~457
DOI : 10.6113/JPE.2012.12.3.448
This paper proposes a carrier-based pulse width modulation (PWM) method to control an indirect matrix converter (IMC) by analyzing the relationship between the space vector PWM (SVPWM) and the carrier-based PWM. The complexity of the SVPWM method for an IMC can be reduced by using an equivalent carrier-based PWM method. The advantage of the proposed algorithm is its ability use only one symmetrical triangular carrier signal to generate the gate signals for all of the power switches in both the rectifier and inverter stages as compared to the conventional method where the carrier signal used in the rectifier stage is different from that of the inverter stage. In addition, by using a suitable offset voltage component in the modulation signals, the output voltage magnitude reaches 0.866 of the input voltage magnitude. Simulation and experimental results are provided in order to validate the proposed method.
DC-Link Active Power Filter for High-Power Single-Phase PWM Converters
Li, Hongbo ; Zhang, Kai ; Zhao, Hui ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 458~467
DOI : 10.6113/JPE.2012.12.3.458
Single phase converters suffer from ripple power pulsating at twice the line frequency. The ripple power is usually absorbed by a bulky capacitor bank and/or a dedicative LC resonant link, resulting in a low power density and a high cost. An alternative solution is using a dc link active power filter (APF) to direct the pulsating power into another energy-storage component. The main dc link filter capacitor can then be reduced substantially. Based on a mainstream dc APF topology, this paper proposed a new control strategy incorporating both dual-loop control and repetitive control. The circuit parameter design is also re-examined from a control point of view. The proposed APF scheme has better control performance, and is more suited for high power applications since it works in CCM and with a low switching frequency.
Maximum Torque Control of an IPMSM Drive Using an Adaptive Learning Fuzzy-Neural Network
Ko, Jae-Sub ; Choi, Jung-Sik ; Chung, Dong-Hwa ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 468~476
DOI : 10.6113/JPE.2012.12.3.468
The interior permanent magnet synchronous motor (IPMSM) has been widely used in electric vehicle applications due to its excellent power to weigh ratio. This paper proposes the maximum torque control of an IPMSM drive using an adaptive learning (AL) fuzzy neural network (FNN) and an artificial neural network (ANN). This control method is applicable over the entire speed range while taking into consideration the limits of the inverter`s rated current and voltage. This maximum torque control is an executed control through an optimal d-axis current that is calculated according to the operating conditions. This paper proposes a novel technique for the high performance speed control of an IPMSM using AL-FNN and ANN. The AL-FNN is a control algorithm that is a combination of adaptive control and a FNN. This control algorithm has a powerful numerical processing capability and a high adaptability. In addition, this paper proposes the speed control of an IPMSM using an AL-FNN, the estimation of speed using an ANN and a maximum torque control using the optimal d-axis current according to the operating conditions. The proposed control algorithm is applied to an IPMSM drive system. This paper demonstrates the validity of the proposed algorithms through result analysis based on experiments under various operating conditions.
Extension of the Operating Speed for Vector-Controlled Induction Machine Drives in the Overmodulation Range
Nguyen, Thanh Hai ; Lee, Dong-Choon ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 477~486
DOI : 10.6113/JPE.2012.12.3.477
This paper proposes a novel current control scheme for vector-controlled induction machine (IM) drives in the overmodulation (OVM) range, with which the voltage utilization of the voltage-source inverter (VSI) can be maximized. In the OVM region, the original voltage reference is modified by changing its magnitude and angle, which causes the motor current to be distorted, resulting in a deterioration of the current control performance. To meet with this situation, the harmonic components in the feedback currents should be eliminated before being input to the PI current controllers. For this, a composite observer is applied to extract the fundamental and harmonic components from the distorted currents, which gives a good performance without a delay and the effect of a fundamental frequency variation. In addition, through a detailed analysis of the response of the PI current controllers in the OVM range, the effectiveness of using the composite observer is demonstrated. Simulation and experimental results for a 3-kW induction motor drive are shown to verify the validity of the proposed method.
Low Cost High Power Density Photovoltaic Power Conditioning System with an Energy Storage System
Jang, Du-Hee ; Han, Sang-Kyoo ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 487~494
DOI : 10.6113/JPE.2012.12.3.487
A new low cost high power density photovoltaic power conditioning system (PV PCS) with an energy storage system is proposed in this paper. Its high power density and cost effectiveness can be achieved through the unification of the maximum power point tracker and the battery charger/discharger. Despite the reduced power stage, the proposed system can achieve the same performance in terms of maximum power point tracking and battery charging/discharging as the conventional system. When a utility power failure happens, the proposed system cannot perform maximum power point tracking at the UPS mode. However, the predetermined battery voltage near the maximum power point of the PV array can effectively generate a reasonable PV power even at the UPS mode. Therefore, it features a simpler structure, less mass, lower cost, and fewer devices. Finally, to confirm the operation, validity, and features of the proposed system, a theoretical analysis and experimental results from a single phase AC 220Vrms/1.5kW prototype are presented.
Improved Grid Voltage Control Strategy for Wind Farms with DFIGs Connected to Distribution Networks
Zhang, Xueguang ; Pan, Weiming ; Liu, Yicheng ; Xu, Dianguo ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 495~502
DOI : 10.6113/JPE.2012.12.3.495
This paper presents an improved grid voltage control strategy for wind farms with doubly-fed induction generators (DFIGs) connected to distribution networks based on an analysis of the operation limits of DFIG systems. A modified reactive power limit calculation method in different operation states is proposed and a reactive power control strategy during grid voltage dips/rises is further discussed. A control strategy for compensating unbalanced grid voltage, based on DFIG systems, by injecting negative sequence current into the grid through the grid side converter (GSC) is proposed. In addition, the negative current limit of the GSC is discussed. The distribution principle of the negative sequence current among the different DFIG systems in a wind farm is also introduced. The validity of the proposed voltage control strategy is demonstrated by Matlab/Simulink simulations. It is shown that the stability of a wind farm and the power grid can be improved with the proposed strategy.
Analog Control Algorithm for Maximum Power Trackers Employed in Photovoltaic Applications
Ji, Sang-Keun ; Jang, Du-Hee ; Hong, Sung-Soo ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 503~508
DOI : 10.6113/JPE.2012.12.3.503
Tracking the Maximum Power Point (MPP) of a photovoltaic (PV) array is usually an essential part of a PV system. The problem addressed by Maximum Power Point Tracking (MPPT) techniques is to find the voltage
at which a PV array should operate to generate the maximum power output
under a given temperature and irradiance. MPPT control methods such as the perturb and observe method and the incremental conductance method require a microprocessor or DSP to determine if the duty cycle should be increased or not. This paper proposes a simple and fast analog MPPT method. The proposed control scheme tracks the MPP very quickly and its hardware implementation is simple when compared with the conventional techniques. The new algorithm can successfully track the MPP even in the case of rapidly changing atmospheric conditions. In addition, it has higher efficiency than ordinary algorithms.
Control Strategies for Multilevel APFs Based on the Windowed-FFT and Resonant Controllers
Han, Yang ;
Journal of Power Electronics, volume 12, issue 3, 2012, Pages 509~517
DOI : 10.6113/JPE.2012.12.3.509
This paper presents control strategies for cascaded H-bridge multilevel active power filters (APFs). A current loop controller is implemented using a proportional-resonant (PR) regulator, which achieves zero steady-state error at target frequencies. The power balancing mechanism for the dc-link capacitor voltages is analyzed and a voltage balancing controller is presented. To mitigate the picket-fence effect of the conventional FFT algorithm under asynchronous sampling conditions, the Hanning Windowed-FFT algorithm is proposed for reference current generation (RCG). This calculates the frequency, amplitude and phase of individual harmonic components accurately and as a result, selective harmonic compensation (SHC) is achieved. Simulation and experimental results are presented, which verify the validity and effectiveness of the devised control algorithms.