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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
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Volume & Issues
Volume 9, Issue 6 - Nov 2009
Volume 9, Issue 5 - Sep 2009
Volume 9, Issue 4 - Jun 2009
Volume 9, Issue 3 - May 2009
Volume 9, Issue 2 - Mar 2009
Volume 9, Issue 1 - Jan 2009
Selecting the target year
A Single-Stage AC/DC Converter with Low Voltage Stresses and Reduced Switching Losses
Kim, Kyu-Tae ; Choi, Woo-Young ; Kwon, Jung-Min ; Kwon, Bong-Hwan ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 823~834
This paper proposes a high-efficiency single-stage ac/dc converter. The proposed converter features low voltage stresses and reduced switching losses. It operates at the boundary of discontinuous- and continuous-conduction modes by employing variable switching frequency control. The turn-on switching loss of the switch can be reduced by turning it on when the voltage across it is at a minimum. The voltage across the bulk capacitor is independent of the output loads and maintained within the practical range for the universal line input, so the problem of high voltage stress across the bulk capacitor is alleviated. Moreover, the voltage stress of the output diodes is clamped to the output voltage, and the output diodes are turned off at zero-current. Thus, the reverse-recovery related losses of the output diodes are eliminated. The operational principles and circuit analysis are presented. A prototype circuit was built and tested for a 150 W (50V/3A) output power. The experimental results verify the performance of the proposed converter.
A New Soft Switching Step-Down/Up Converter with Inherent PFC Performance
Jabbari, Masoud ; Farzanehfard, Hosein ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 835~844
In this paper a new buck-boost type DC-DC converter is presented. Its voltage gain is positive, all active elements operate under soft-switching condition independent of loading, magnetic isolation and self output short-circuit protection exist, and very fast dynamic operation is achievable by a simple bang-bang controller. This converter also exhibits appropriate PFC characteristics since its input current is inherently proportional to the source voltage. When the voltage source is off-line, it is sufficient to add an inductor after the rectifier, then near unity power factor is achievable. All essential guidelines to design the converter as a DC-DC and a PFC regulator are presented. Simulation and experimental results verify the developed theoretical analysis.
Radial Force Control of a Novel Hybrid Pole BLSRM
Wang, Hui-Jun ; Lee, Dong-Hee ; Ahn, Jin-Woo ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 845~853
This paper presents a novel hybrid pole BLSRM (Bearingless Switched Reluctance Motor) and its radial force control scheme. The proposed hybrid pole BLSRM has separated radial force poles and rotating torque poles. According to the FEM analysis, the proposed BLSRM has an excellent linear characteristic of radial force and controllability that is independent from the torque current. The radial force can be produced by the radial force winding which is wound at the separated radial force poles. The rotating torque is produced by the excitation current of the torque windings which are wound at the torque pole. The proposed radial force control scheme is independent of the phase torque winding current. A simple PID controller and look-up table are used to maintain a constant rotor air-gap. The proposed BLSRM and its radial force control scheme are verified by FEM analysis and experimental tests.
Super-Lift DC-DC Converters: Graphical Analysis and Modelling
Zhu, Miao ; Luo, Fang Lin ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 854~865
Super-lift dc-dc converters are a series of advanced step-up dc-dc topologies that provide high voltage transfer gains by super-lift techniques. This paper presents a developed graphical modelling method for super-lift converters and gives a thorough analysis with a consideration of the effects caused by parasitic parameters and diodes' forward voltage drop. The general guidelines for constructing and deriving graphical models are provided for system analysis. By applying it to examples, the proposed method shows the advantages of high convenience and feasibility. Both the circuit simulation and experimental results are given to support the theoretical analysis.
Variable Structure PWM Controller for Highly Efficient PV Inverters
Oh, Seong-Jin ; SunWoo, Myoung-Ho ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 866~873
In general, the output voltage level of a PV array varies widely at various irradiances and temperatures. The MPP (Maximum Power Point) range of a medium- or high-power PV PCS is normally 450~830Vdc or 300~600Vdc. This means the PV PCS should operate in a wide range of modulation indexes. The PV PCS should satisfy the harmonic current requirement that the TDD (Total demand distortion) shall not exceed 5%. This paper proposes a new PWM control method for a medium- or high-power PV PCS which increases the efficiency of power conversion in all operation ranges with acceptable harmonic ripple currents. This paper compares and analyzes appropriate PWM schemes for the PV PCS in the view points of conversion efficiency and current harmonics.
Battery Energy Storage Based Voltage and Frequency Controller for Isolated Pico Hydro Systems
Singh, Bhim ; Rajagopal, V. ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 874~883
This paper deals with an integrated voltage and frequency (VF) controller for isolated asynchronous generators (IAG) driven by a constant power pico-hydro uncontrolled turbine feeding three-phase four-wire loads. The proposed VF controller is used to control the frequency and voltage of an IAG with load leveling. Such a VF controller is also known as an integrated electronic load controller (IELC) which is realized using an isolated star/polygon transformer with a voltage source converter (VSC) and a battery at its DC bus. The proposed generating system with a VFC is modeled and simulated in MATLAB along with Simulink and Simpower system (SPS) toolboxes. The simulated results are presented to demonstrate the performance of an isolated asynchronous generator feeding three-phase four-wire loads with neutral current compensation.
An Address Voltage Stabilization Circuit for the Single-Side Driving Method of AC Plasma Display Panels
Kim, Tae-Hyung ; Kang, Jung-Won ; Lee, Jun-Young ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 884~891
An address voltage stabilization circuit for the single-side driving (SSD) method for AC plasma display panels (PDP) is proposed. The single-side driving method, which eliminates a common sustaining driver, uses only two electrodes in a three electrode AC PDP structure. The high-impedance (Hi-Z) mode operation of the data drive ICs during the sustaining period is needed for surface gas-discharge without misfiring in the SSD method but it produces the problem that the address voltage increases up to the breakdown voltage. The proposed circuit based on a flyback converter can stabilize the address voltage under the breakdown voltage and provide better surface gas-discharge performance without any misfiring in the SSD scheme.
Dynamic Coordination Strategies between HVDC and STATCOM
Kim, Chan-Ki ; Sood, Vijay ; Lee, Seok-Jin ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 892~902
This paper deals with the dynamic voltage control problem at the inverter end of a HVDC link when connected to a weak AC system which has the potential for harmonic instability and commutation failures. The dynamic voltage control problem is tackled with a STATCOM (Static Compensator), which not only provides a rapid recovery from harmonic instability and commutation failures but also offers a lower cost filter design for HVDC systems. PSCAD/EMTDC simulations are presented to validate the proposed topology and to demonstrate its robust performance.
Digital Control of a Power Factor Correction Boost Rectifier Using Diode Current Sensing Technique
Shin, Jong-Won ; Hyeon, Byeong-Cheol ; Cho, Bo-Hyung ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 903~910
In this paper, a digital average current mode control using diode current sensing technique is proposed. Although the conventional inductor current sensing technique is widely used, the sensed signal of the current is negative. As a result, it requires an additional circuit to be applied to general digital controller ICs. The proposed diode current sensing method not only minimizes the peripheral circuit around the digital IC but also consumes less power to sense current information than the inductor current sensing method. The feasibility of the proposed technique is verified by experiments using a 500W power factor correction (PFC) boost rectifier.
Sensorless Control of a Single-Phase Switched Reluctance Motor Using Residual Flux
Yang, Hyong-Yeol ; Shin, Duck-Shick ; Lim, Young-Cheol ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 911~918
This paper presents a new sensorless control method for single-phase switched reluctance motors using induced electromotive force (EMF) due to the residual flux both on the stator and the rotor during phase commutation. The induced EMF falls to zero when the rotor pole moves away from the overlap with the stator pole. By detecting this instant, the speed and position of the rotor can be simply estimated. This method is very simple to implement and it is insensitive to variations in the system parameters as it does not require any stored magnetic data or offline inductance measurements but requires only measurements of the terminal voltage and a simple analog circuit. The proposed method is implemented on a 6/6 single-phase switched reluctance motor. However, it can also be implemented on a multiphase SRM regardless of the size, operation speed and switching mode of the motor hence making the proposed method viable to many applications. Simulation and experimental verification is provided to demonstrate the feasibility of the proposed method.
DP Formulation of Microgrid Operation with Heat and Electricity Constraints
Nguyen, Minh Y ; Choi, Nack-Hyun ; Yoon, Yong-Tae ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 919~928
Microgrids (MGs) are typically comprised of distributed generators (DGs) including renewable energy sources (RESs), storage devices and controllable loads, which can operate in either interconnected or isolated mode from the main distribution grid. This paper introduces a novel dynamic programming (DP) approach to MG optimization which takes into consideration the coordination of energy supply in terms of heat and electricity. The DP method has been applied successfully to several cases in power system operations. In this paper, a special emphasis is placed on the uncontrollability of RESs, the constraints of DGs, and the application of demand response (DR) programs such as directed load control (DLC), interruptible/curtaillable (I/C) service, and/or demand-side bidding (DSB) in the deregulated market. Finally, in order to illustrate the optimization results, this approach is applied to a couple of examples of MGs in a certain configuration. The results also show the maximum profit that can be achieved.
High Efficiency Soft-Switching Boost Converter Using a Single Switch
Kim, Jun-Ho ; Jung, Doo-Yong ; Park, Sang-Hoon ; Won, Chung-Yuen ; Jung, Yong-Chae ; Lee, Su-Won ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 929~939
This paper presents a new soft-switching boost converter based on the LC resonance and passive clamping technique without additional active switches. The circuit achieves high efficiency and low voltage stress by adopting a soft switching method using LC resonance. This paper gives a mathematical analysis of each mode and a detailed design procedure of the proposed boost converter. First of all, the operational principles are verified through simulation results. Then, according to the design procedure, we designed and built a 1.5[kW] prototype soft switching boost converter. Through the experimental results, we demonstrated the validity and usefulness of the proposed boost converter.
A Loss Minimization Control Strategy for Direct Torque Controlled Interior Permanent Magnet Synchronous Motors
Siahbalaee, Jafar ; Vaez-Zadeh, Sadegh ; Tahami, Farzad ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 940~948
The main objective of this a paper is to improve the efficiency of permanent magnet synchronous motors (PMSMs) by using an improved direct torque control (DTC) strategy. The basic idea behind the proposed strategy is to predict the impact of a small change in the stator flux amplitude at each sampling period to decrease electrical loss before the change is applied. Accordingly, at every sampling time, a voltage vector is predicted and applied to the machine to fulfill the flux change. The motor drive simulations confirm a significant improvement in efficiency as well as a very fast and smooth response under the proposed strategy.
Investigation of Fault-Mode Behaviors of Matrix Converters
Kwak, Sang-Shin ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 949~959
This paper presents a systematic investigation of the fault-mode behaviors of matrix converter systems. Knowledge about converter behaviors after fault occurrence is important from the standpoint of reliable system design, protection and fault-tolerant control. Converter behaviors have been, in detail, examined with both qualitative and quantitative approaches for key fault types, such as switch open-circuited faults and switch short-circuited faults. Investigating the fault-mode behaviors of matrix converters reveals that converter operation with switch short-circuited faults leads to overvoltage stresses as well as overcurrent stresses on other healthy switching components. On the other hand, switch open-circuited faults only result in overvoltage to other switching components. This study can be used to predict fault-mode converter behaviors and determine additional stresses on remaining power circuit components under fault-mode operations.
Development of Hybrid Electric Compressor Motor Drive System for Hybrid Electrical Vehicles
Jung, Tae-Uk ;
Journal of Power Electronics, volume 9, issue 6, 2009, Pages 960~968
This paper presents a design optimization process for interior permanent magnet synchronous motors (IPMSM) for hybrid electric compressors (HEC) which are applied to hybrid electrical vehicles. A hybrid electric compressor is composed of an electric motor driving section and an engine driving section which is connected to the engine by a pulley belt. A hybrid electric compressor driving motor requires half of the full driving power of a compressor. Even though an engine is not operated at the idling stop mode, the electric motor drives the air-conditioner compressor by itself so that the air conditioning system can produce its minimum cooling capacity. In this paper, the design optimization of an IPMSM for a 42 (V) applied voltage system is studied using the design of experiment (DOE) and response surface method (RSM) of 6sigma. The driving characteristics of this motor drive system are measured and analyzed by experiment.