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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 11, Issue 6 - Nov 2011
Volume 11, Issue 5 - Sep 2011
Volume 11, Issue 4 - Jul 2011
Volume 11, Issue 3 - May 2011
Volume 11, Issue 2 - Mar 2011
Volume 11, Issue 1 - Jan 2011
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A Fully Soft Switched Two Quadrant Bidirectional Soft Switching Converter for Ultra Capacitor Interface Circuits
Mirzaei, Amin ; Farzanehfard, Hosein ; Adib, Ehsan ; Jusoh, Awang ; Salam, Zainal ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 1~9
DOI : 10.6113/JPE.2011.11.1.001
This paper describes a two quadrant bidirectional soft switching converter for ultra capacitor interface circuits. The total efficiency of the energy storage system in terms of size and cost can be increased by a combination of batteries and ultra capacitors. The required system energy is provided by a battery, while an ultra capacitor is used at high load power pulses. The ultra capacitor voltage changes during charge and discharge modes, therefore an interface circuit is required between the ultra capacitor and the battery. This interface circuit must have good efficiency while providing bidirectional power conversion to capture energy from regenerative braking, downhill driving and the protecting ultra capacitor from immediate discharge. In this paper a fully soft switched two quadrant bidirectional soft switching converter for ultra capacitor interface circuits is introduced and the elements of the converter are reduced considerably. In this paper, zero voltage transient (ZVT) and zero current transient (ZCT) techniques are applied to increase efficiency. The proposed converter acts as a ZCT Buck to charge the ultra capacitor. On the other hand, it acts as a ZVT Boost to discharge the ultra capacitor. A laboratory prototype converter is designed and realized for hybrid vehicle applications. The experimental results presented confirm the theoretical and simulation results.
Quasi Resonant DC Link Inverter with a Simple Auxiliary Circuit
Amini, Mohammad Reza ; Farzanehfard, Hosein ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 10~15
DOI : 10.6113/JPE.2011.11.1.010
In this paper, a new soft switching three phase inverter with a quasi-resonant dc-link is presented. The proposed inverter has a dc-link switch and an auxiliary switch. The inverter switches are turned on and off under zero voltage switching condition and all auxiliary circuit switches and diodes are also soft switched. The control utilizes PWM and the auxiliary switch does not require an isolated gate drive circuit. In this paper, the operation analysis and design considerations of the proposed soft switching inverter are discussed. The presented experimental results of a realized prototype confirm the theoretical analysis.
Zero-Voltage-Switching Boost Converter Using a Coupled Inductor
Do, Hyun-Lark ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 16~20
DOI : 10.6113/JPE.2011.11.1.016
This paper presents a zero-voltage-switching (ZVS) boost converter using a coupled inductor. It utilizes an additional winding to the boost inductor and an auxiliary diode. The ZVS characteristic of the proposed converter reduces the switching losses of the active power switches and raises the power conversion efficiency. The principle of operation and a system analysis are presented. The theoretical analysis and performance of the proposed converter were verified with a 100W experimental prototype operating at a 107 kHz switching frequency.
Multilevel Inverter to Reduce Common Mode Voltage in AC Motor Drives Using SPWM Technique
Renge, Mohan M. ; Suryawanshi, Hiralal M. ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 21~27
DOI : 10.6113/JPE.2011.11.1.021
In this paper, an approach to reduce common-mode voltage (CMV) at the output of multilevel inverters using a phase opposition disposed (POD) sinusoidal pulse width modulation (SPWM) technique is proposed. The SPWM technique does not require computations therefore, this technique is easy to implement on-line in digital controllers. A good tradeoff between the quality of the output voltage and the magnitude of the CMV is achieved in this paper. This paper realizes the implementation of a POD-SPWM technique to reduce CMV using a five-level diode clamped inverter for a three phase induction motor. Experimental and simulation results demonstrate the feasibility of the proposed technique.
A Digitally Controlled Three-Phase Cycloconverter Type High Frequency AC Link Inverter Using Space Vector Modulation
Sha, Deshang ; Qin, Zian ; Wu, Dan ; Liao, Xiaozhong ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 28~36
DOI : 10.6113/JPE.2011.11.1.028
In this paper, a three phase cycloconverter type high frequency AC link inverter is discussed. The configuration consists of a high frequency full-bridge inverter and a high frequency transformer followed by a three phase cycloconverter whose switch is composed of anti-series connected MOSFETs with a common source. A simple digital control strategy based on space vector modulation (SVM) and repetitive control for the cycloconverter is proposed although its input voltage is a high frequency AC pulse. The operation principle of the proposed control strategy is analyzed and the equivalent working modes during one interval are also presented. The effectiveness of the proposed control strategy is verified through Matlab/Simulink simulations and experiments on a 1.45kW prototype.
Acoustic Noise Reduction and Power Factor Correction in Switched Reluctance Motor Drives
Rashidi, Amir ; Saghaiannejad, Sayed Mortaza ; Mousavi, Sayed Javad ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 37~44
DOI : 10.6113/JPE.2011.11.1.037
In this paper, a four-phase 8/6-pole 4-kW SR motor drive model is presented. Based on experimental data, the model allows an accurate simulation of a drive in dynamic operation. Simulations are performed and a laboratory type set-up is built based on a TI TMS320F2812 platform to experimentally verify the theoretical results obtained for a SR motor. To reduce acoustic noise and to correct the power factor of this drive, a two-stage power converter is proposed that uses a current source rectifier (CSR) as the input stage for the asymmetrical converter of the studied SRM. Employing the space-vector modulation (SVM) method in matrix converters, the CSR switching allows the dc link`s capacitors to be eliminated and the power factor of the SRM drive to be improved. As the electrical motive force (emf) is directly proportional to the rotor speed, the input voltage to the machine can be programmed to be a function of the speed with the modulation index of the CSR, leading to a reduction in the acoustic noise of the SRM drive. Simulation of the whole SRM drive system is performed using MATLAB-Simulink. The results fully comply with the required conditions such as power factor correction with an improvement in the THD.
Comparison and Evaluation of Anti-Windup PI Controllers
Li, Xin-Lan ; Park, Jong-Gyu ; Shin, Hwi-Beom ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 45~50
DOI : 10.6113/JPE.2011.11.1.045
This paper proposes a method for comparing and evaluating anti-windup proportional-integral (PI) control strategies. The so-called PI plane is used and its coordinate is composed of the error and the integral state. In addition, an anti-windup PI controller with integral state prediction is proposed. The anti-windup scheme can be easily analyzed and evaluated on the PI plane in detail. Representative anti-windup methods are experimentally applied to the speed control of a vector-controlled induction motor driven by a pulse width modulated (PWM) voltage-source inverter (VSI). The experimental results compare the anti-windup PI controllers. It is empathized that the initial value of the integral state at the beginning of the linear range dominates the control performance in terms of overshoot and settling time.
Developing Function Models of Back-to-Back PWM Converters for Simplified Simulation
Van, Tan Luong ; Lee, Dong-Choon ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 51~58
DOI : 10.6113/JPE.2011.11.1.051
In this paper, a function model of back-to-back PWM converters, based on the switching function, is developed for simplified simulation of power electronic application systems. For the function model, the PWM power switches are represented by dependent power sources. By using the proposed function model, the computer memory and the run time required for the simulation of power circuits can be significantly reduced. It is shown that the simulation results generated from the function models are almost the same as the ones obtained by using the switching power device model.
Modeling of the Sampling Effect in the P-Type Average Current Mode Control
Jung, Young-Seok ; Kim, Marn-Go ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 59~63
DOI : 10.6113/JPE.2011.11.1.059
This paper presents the modeling of the sampling effect in the p-type average current mode control. The prediction of the high frequency components near half of the switching frequency in the current loop gain is given for the p-type average current mode control. By the proposed model, the prediction accuracy is improved when compared to that of conventional models. The proposed method is applied to a buck converter, and then the measurement results are analyzed.
Improved Deadbeat Current Controller with a Repetitive-Control-Based Observer for PWM Rectifiers
Gao, Jilei ; Zheng, Trillion Q. ; Lin, Fei ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 64~73
DOI : 10.6113/JPE.2011.11.1.064
The stability of PWM rectifiers with a deadbeat current controller is seriously influenced by computation time delays and low-pass filters inserted into the current-sampling circuit. Predictive current control is often adopted to solve this problem. However, grid current predictive precision is affected by many factors such as grid voltage estimated errors, plant model mismatches, dead time and so on. In addition, the predictive current error aggravates the grid current distortion. To improve the grid current predictive precision, an improved deadbeat current controller with a repetitive-control-based observer to predict the grid current is proposed in this paper. The design principle of the proposed observer is given and its stability is discussed. The predictive performance of the observer is also analyzed in the frequency domain. It is shown that the grid predictive error can be decreased with the proposed method in the related bode diagrams. Experimental results show that the proposed method can minimize the current predictive error, improve the current loop robustness and reduce the grid current THD of PWM rectifiers.
A Novel Filter Design for Output LC Filters of PWM Inverters
Kim, Hyo-Sung ; Sul, Seung-Ki ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 74~81
DOI : 10.6113/JPE.2011.11.1.074
The cutoff frequency of the output LC filters of PWM inverters limits the control bandwidth of the converter system while it attenuates voltage ripples that are caused by inverter switching activities. For a selected cutoff frequency of an output LC filter, an infinite number of L-C combinations is possible. This paper analyses the characteristics of output LC filters for PWM inverters terms of the L-C combinations. Practical circuit conditions such as no-loads, full resistive-loads, and inductive-load conditions are considered in the analysis. This paper proposes a LC filter design method for PWM inverters considering both the voltage ynamics and he inverter stack size. An experimental PWM inverter system based on the proposed output LC lter design uideline is built and tested.
An Experimental Analysis of the Ripple Current Applied Variable Frequency Characteristic in a Polymer Electrolyte Membrane Fuel Cell
Kim, Jong-Hoon ; Jang, Min-Ho ; Choe, Jun-Seok ; Kim, Do-Young ; Tak, Yong-Sug ; Cho, Bo-Hyung ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 82~89
DOI : 10.6113/JPE.2011.11.1.082
Differences in the frequency characteristic applied to a ripple current may shorten fuel cell life span and worsen the fuel efficiency. Therefore, this paper presents an experimental analysis of the ripple current applied variable frequency characteristic in a polymer electrolyte membrane fuel cell (PEMFC). This paper provides the first attempt to examine the impact of ripple current through immediate measurements on a single cell test. After cycling for hours at three frequencies, each polarization and impedance curve is obtained and compared with those of a fuel cell. Through experimental results, it can be absolutely concluded that low frequency ripple current leads to long-term degradation of a fuel cell. Three different PEMFC failures such as membrane dehydration, flooding and carbon monoxide (CO) poisoning that lead to an increase in the impedance magnitude at low frequencies are simply introduced.
Sensitivity-Based Method for the Effective Location of SSSC
Eghtedarpour, Navid ; Seifi, Ali Reza ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 90~96
DOI : 10.6113/JPE.2011.11.1.090
Congestion management is one of the most challenging aspects in the recently deregulated electricity markets. FACTS devices have been shown to be an efficient alternative to control the flow of power in lines, resulting in increased loadability, lower system loss and a reduced cost of production. In this paper, the application of a static series synchronous compensator (SSSC) for the purpose of congestion management of power systems has been studied. A sensitivity-based analysis method is utilized for effective determination of the SSSC location in an electricity market. The method is topology based and it is independent of the system operation point. A power injection p-model is developed for the SSSC in this study. Numerical results based on the modified IEEE 14 bus system with/without the SSSC demonstrate the feasibility as well as the effectiveness of the SSSC for congestion management in a network. The results obtained when using the SSSC to improve system transfer capability and congestion management is encouraging.
High Efficiency Alternating Current Driver for Capacitive Loads Using a Current-Balance Transformer
Baek, Jong-Bok ; Cho, Bo-Hyung ; Park, Joung-Hu ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 97~104
DOI : 10.6113/JPE.2011.11.1.097
This paper proposes a new alternating current driving method for highly capacitive loads such as plasma display panels or piezoelectric actuators, etc. In the proposed scheme, a current balance transformer, which has two windings with the same turn-ratio, provides not only a resonance inductance for energy recovery but also a current balance among all of the switching devices of the driver for current stress reduction. The smaller conduction loss than conventional circuits occurs due to the dual conduction paths which are parallel each other in the current balance transformer. Also, the leakage inductances of the transformer are utilized as resonant inductors for energy recovery by the series resonance to the capacitive load. Furthermore, the resonance contributes to the small switching losses of the switching devices by soft-switching operation. To confirm the validity of the proposed circuit, prototype hardware with a 12-inch mercury-free flat fluorescent lamp is implemented. The experimental results are compared with a conventional energy-recovery circuit from the perspective of luminance performances.
Design Optimization of Linear Synchronous Motors for Overall Improvement of Thrust, Efficiency, Power Factor and Material Consumption
Vaez-Zadeh, Sadegh ; Hosseini, Monir Sadat ;
Journal of Power Electronics, volume 11, issue 1, 2011, Pages 105~111
DOI : 10.6113/JPE.2011.11.1.105
By having accurate knowledge of the magnetic field distribution and the thrust calculation in linear synchronous motors, assessing the performance and optimization of the motor design are possible. In this paper, after carrying out a performance analysis of a single-sided wound secondary linear synchronous motor by varying the motor design parameters in a layer model and a d-q model, machine single- and multi-objective design optimizations are carried out to improve the thrust density of the motor based on the motor weight and the motor efficiency multiplied by its power factor by defining various objective functions including a flexible objective function. A genetic algorithm is employed to search for the optimal design. The results confirm that an overall improvement in the thrust mean, efficiency multiplied by the power factor, and thrust to the motor weight ratio are obtained. Several design conclusions are drawn from the motor analysis and the design optimization. Finally, a finite element analysis is employed to evaluate the effectiveness of the employed machine models and the proposed optimization method.