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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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A High Performance Three-Phase Telecom Supply Incorporating a HF Switched Mode Rectifier with a Phase Shifted PWM Controller
Shahani, Arushi ; Singh, Bhim ; Bhuvaneshwari, G. ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 219~227
DOI : 10.6113/JPE.2010.10.3.219
Telecom supplies need to conform to low Total Harmonic Distortion (THD) and high Power Factor (PF) as per IEC 61000-3-2 and IEEE 519-1992 standards. These high rating power supplies use a three phase utility in which low THD and high PF are realized via various passive and active wave shaping schemes. In this paper, a new design for three phase telecom power supplies is presented with circuit parameter values optimized for high performance in terms of a low THD, high PF, low ripple and high line and load regulation using a suitable combination of various strategies. The performance of the power supply is validated by extensive simulations.
Conducted-Noise Characteristics of a Digitally-Controlled Randomly-Switched DC-DC Converter with an FPGA-Based Implementation
Dousoky, Gamal M. ; Shoyama, Masahito ; Ninomiya, Tamotsu ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 228~234
DOI : 10.6113/JPE.2010.10.3.228
This paper investigates the conducted-noise characteristics of a digitally-controlled randomly-switched dc-dc converter. In order to investigate the effect of the suggested digital controller on the conducted-noise characteristics of a dc-dc converter, three factors have been studied: the field-programmable gate array (FPGA) clock speed, the randomization ratio percentage, and the effect of using a closed loop feedback controller. A field-programmable gate array is much more flexible than analog control circuits, has a lower cost, and can be used for power supply applications. A novel FPGA-based implementation has been suggested for obtaining the experimental validations and realizing the studied concepts. Furthermore, the experimental results have been discussed and design guidelines have been included.
An Isolated Soft-Switching Bidirectional Buck-Boost Inverter for Fuel Cell Applications
Zhang, Lianghua ; Yang, Xu ; Chen, Wenjie ; Yao, Xiaofeng ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 235~244
DOI : 10.6113/JPE.2010.10.3.235
This paper presents a new isolated soft-switching bidirectional buck-boost inverter for fuel cell applications. The buck-boost inverter combines an isolated DC-DC converter with a conventional inverter to implement buck-boost DC-DC and DC-AC conversion. The main switches achieve zero voltage switching and zero current switching by using a novel synchronous switching SVPWM and the volume of the transformer in the forward and fly-back mode is also minimized. This inverter is suitable for wide input voltage applications due to its high efficiency under all conditions. An active clamping circuit reduces the switch's spike voltage and regenerates the energy stored in the leakage inductance of the transformer; therefore, the overall efficiency is improved. This paper presents the operating principle, a theoretical analysis and design guidelines. Simulation and experimental results have validated the characteristics of the buck-boost inverter.
Digital Control Strategy for Input-Series-Output-Parallel Modular DC/DC Converters
Sha, Deshang ; Guo, Zhiqiang ; Liao, Xiaozhong ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 245~250
DOI : 10.6113/JPE.2010.10.3.245
Input-series-output-parallel (ISOP) converters consisting of multiple modular DC/DC converters can enable low voltage rating switches to be used under high voltage input applications. This paper presents a digital control strategy, which can achieve equal sharing of input voltage for a modular ISOP system consisting of two-transistor forward DC/DC converters by forcing the input voltages of neighboring modules to be equal. The proposed scheme is analyzed using small signals analysis based on the state space average method. The performance of the proposed control strategy is verified with an experimental prototype of an ISOP converter made up of three two-switch forward converters.
Optimal Topologies for Cascaded Sub-Multilevel Converters
Babaei, Ebrahim ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 251~261
DOI : 10.6113/JPE.2010.10.3.251
The general function of a multilevel converter is to synthesize a desired output voltage from several levels of dc voltages as inputs. In order to increase the steps in the output voltage, a new topology is recommended in , which benefits from a series connection of sub-multilevel converters. In the procedure described in this reference, despite all the advantages, it is not possible to produce all the steps (odd and even) in the output. In addition, for producing an output voltage with a constant number of steps, there are different configurations with a different number of components. In this paper, the optimal structures for this topology are investigated for various objectives such as minimum number of switches and dc voltage sources and minimum standing voltage on the switches for producing the maximum output voltage steps. Two new algorithms for determining the dc voltage sources magnitudes have been proposed. Finally, in order to verify the theoretical issues, simulation and experimental results for a 49-level converter with a maximum output voltage of 200V are presented.
Design of a Cascaded H-Bridge Multilevel Inverter Based on Power Electronics Building Blocks and Control for High Performance
Park, Young-Min ; Ryu, Han-Seong ; Lee, Hyun-Won ; Jung, Myung-Gil ; Lee, Se-Hyun ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 262~269
DOI : 10.6113/JPE.2010.10.3.262
This paper proposes a practical design for a Cascaded H-Bridge Multilevel (CHBM) inverter based on Power Electronics Building Blocks (PEBB) and high performance control to improve current control and increase fault tolerance. It is shown that the expansion and modularization characteristics of the CHBM inverter are improved since the individual inverter modules operate more independently, when using the PEBB concept. It is also shown that the performance of current control can be improved with voltage delay compensation and the fault tolerance can be increased by using unbalance three-phase control. The proposed design and control methods are described in detail and the validity of the proposed system is verified experimentally in various industrial fields.
Identification of DC-Link Capacitance for Single-Phase AC/DC PWM Converters
Pu, Xing-Si ; Nguyen, Thanh Hai ; Lee, Dong-Choon ; Lee, Suk-Gyu ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 270~276
DOI : 10.6113/JPE.2010.10.3.270
In this paper, a capacitance estimation scheme for DC-link capacitors for single-phase AC/DC PWM converters is proposed. Under the no-load condition, a controlled AC current (30[Hz]) is injected into the input side, which then causes AC voltage ripples at the DC output side. Or, a controlled AC voltage can be directly injected into the DC output side. By extracting the AC voltage/current and power components on the DC output side using digital filters, the capacitance value can be calculated, where the recursive least squares (RLS) algorithm is used. The proposed methods can be simply implemented with software only and additional hardware is not required. From the experiment results, a high accuracy estimation of capacitances less than 0.85% has been obtained.
Efficient Hybrid Carrier Based Space Vector Modulation for a Cascaded Multilevel Inverter
Govindaraju, C. ; Baskaran, K. ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 277~284
DOI : 10.6113/JPE.2010.10.3.277
This paper presents a novel hybrid carrier based space vector modulation for cascaded multilevel inverters. The proposed technique inherits the properties of carrier based space vector modulation and the fundamental frequency modulation strategy. The main characteristic of this modulation are the reduction of power loss, and improved harmonic performance. The carrier based space vector modulation algorithm is implemented with a TMS320F2407 digital signal processor. A Xilinx Complex Programmable Logic Device is used to develop the hybrid PWM control algorithm and it is integrated with a digital signal processor for hybrid carrier based space vector PWM generation. The inverter offers less weighted total harmonic distortion and it operates with equal electrostatic and electromagnetic stress among the power devices. The feasibility of the proposed technique is verified by spectral analysis, simulation, and experimental results.
Current Mode Integrated Control Technique for Z-Source Inverter Fed Induction Motor Drives
Thangaprakash, Sengodan ; Krishnan, Ammasai ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 285~292
DOI : 10.6113/JPE.2010.10.3.285
This paper presents a current mode integrated control technique (CM-ICT) using a modified voltage space vector modulation (MSVM) for Z-source inverter (ZSI) fed induction motor drives. MSVM provides a better DC voltage boost in the dc-link, a wide range of AC output voltage controllability and a better line harmonic profile. In a voltage mode ICT (VM-ICT), the outer voltage feedback loop alone is designed and it enforces the desired line voltage to the motor drive. An integrated control technique (ICT), with an inner current feedback loop is proposed in this paper for the purpose of line current limiting and soft operation of the drive. The current command generated by the PI controller and limiter in the outer voltage feedback loop, is compared with the actual line current, and the error is processed through the PI controller and a limiter. This limiter ensures that, the voltage control signal to the Z-source inverter is constrained to a safe level. The rise and fall of the control signal voltage are made to be gradual, so as to protect the induction motor drive and the Z-source inverter from transients. The single stage controller arrangement of the proposed CM-ICT offers easier compensation. Analysis, Matlab/Simulink simulations, and experimental results have been presented to validate the proposed technique.
PFC Dual Boost Converter Based on Input Voltage Estimation for DC Inverter Air Conditioner
Park, Gwi-Geun ; Kwon, Kee-Yong ; Kim, Tae-Woong ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 293~299
DOI : 10.6113/JPE.2010.10.3.293
In this paper, a single-phase PFC (Power Factor Correction) dual boost converter based on input voltage estimation is studied for DC inverter air conditioner. It is focused on improving input power factor and power quality to satisfy the recent harmonic current regulation standards. Furthermore the input voltage estimation is introduced for price competitive products. A low cost and reasonable control system is implemented using a specified high-speed 32-bit microprocessor. Their effectiveness are verified through theoretical analysis and experiments.
PMSM Angle Detection Based on the Edge Field Measurements by Hall Sensors
Kim, Jae-Uk ; Jung, Sung-Yoon ; Nam, Kwang-Hee ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 300~305
DOI : 10.6113/JPE.2010.10.3.300
This paper presents a two Hall sensor method for rotor angle detection in permanent magnet synchronous motors (PMSM). To minimize the implementation complexity, the system is designed to measure the edge field of permanent magnet pieces. However, there are nonlinearities in the measured values of the edge field. In this work, an angle correction algorithm is proposed, and the improvements in accuracy are verified through experiments. Finally, a field orientation controller is constructed with the proposed angle detection algorithm.
A New Optimum Design for a Single Input Fuzzy Controller Applied to DC to AC Converters
Ayob, Shahrin Md. ; Salam, Zainal ; Azli, Naziha Ahmad ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 306~312
DOI : 10.6113/JPE.2010.10.3.306
In this paper, the design of an optimum single input Fuzzy controller for application in dc to ac converters is presented. Contrary to conventional Fuzzy controllers, the proposed controller has a smaller number of rules and tuning parameters but is capable of performing identically to a conventional controller. These benefits lead to a simpler controller design. The controller is designed as a PI controller for small-signal disturbances. However, for optimum large-signal performance, heuristic tuning is used. The tuning is less complicated and hence optimum large-signal performance is achievable. The system is simulated and a hardware prototype was developed for comparison purposes.
Reduction of Current Ripples due to Current Measurement Errors in a Doubly Fed Induction Generator
Park, Gwi-Geun ; Hwang, Seon-Hwan ; Kim, Jang-Mok ; Lee, Kyo-Beum ; Lee, Dong-Choon ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 313~319
DOI : 10.6113/JPE.2010.10.3.313
This paper proposes a new compensation algorithm for the current measurement errors in a DFIG (Doubly Fed Induction Generator). Generally, current measurement path with current sensors and analog devices has non-ideal factors like offset and scaling errors. As a result, the dq-axis currents of the synchronous reference frame have one and two times ripple components of the slip frequency. In this paper, the main concept of the proposed algorithm is implemented by integrating the 3-phase rotor currents into the stationary reference frame to compensate for the measured current ripples in a DFIG. The proposed algorithm has several beneficial features: easy implementation, less computation time, and robustness with regard to variations in the electrical parameters. The effectiveness of the proposed algorithm is verified by several experiments.
Electrical Technologies for Grid Integration of Ocean Wave Power into the UK National Grid
Ahmed, Tarek ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 320~327
DOI : 10.6113/JPE.2010.10.3.320
In this paper, multiple offshore wave energy converters with different output characteristics are connected to one power distribution substation. The connection between the power take-off of the different wave energy converters and the electrical power transmission system is presented in order to investigate whether multiple wave energy converters can augment energy yield and improve network integration capabilities. Moreover, the model of an array of wave energy converters is developed with the goal of analyzing the effects of the offshore wave farm on the electrical network to which it is connected. It is also developed to ensure that the electricity generated by the array is sufficiently controllable, and of a quality that can be integrate into the electricity supply network without unduly increasing the cost of connection, production or delivery.
Mitigation of Low Frequency AC Ripple in Single-Phase Photovoltaic Power Conditioning Systems
Lee, Sang-Hoey ; An, Tae-Pung ; Cha, Han-Ju ;
Journal of Power Electronics, volume 10, issue 3, 2010, Pages 328~333
DOI : 10.6113/JPE.2010.10.3.328
A photovoltaic power conditioning system (PV PCS) that contains single-phase dc/ac inverters tends to draw an ac ripple current at twice the output frequency. Such a ripple current perturbs the operating points of solar cells continuously and it may reduce the efficiency of the current based maximum power point tracking technique (CMPPT). In this paper, the ripple current generation in a dc link and boost inductor is analyzed using the ac equivalent circuit of a dc/dc boost converter. A new feed-forward ripple current compensation method to incorporate a current control loop into a dc/dc converter for ripple reduction is proposed. The proposed feed-forward compensation method is verified by simulation and experimental results. These results show a 41.8 % reduction in the peak-to peak ac ripple. In addition, the dc/ac inverter control system uses an automatic voltage regulation (AVR) function to mitigate the ac ripple voltage effect in the dc link. A 3kW PV PCS prototype has been built and its experimental results are given to verify the effectiveness of the proposed method.