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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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Analysis and Design of a High Voltage Flyback Converter with Resonant Elements
Hong, Sung-Soo ; Ji, Sang-Keun ; Jung, Young-Jin ; Roh, Chung-Wook ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 107~114
DOI : 10.6113/JPE.2010.10.2.107
This paper presents the operational characteristics of a high voltage flyback converter with resonant elements. In high voltage low power applications, the effect of a transformer’s stray capacitance might be the most important factor that influences the overall performance of the circuit. A detailed mode analysis and the design procedure are presented in designing the high voltage flyback converter. To verify and confirm the validities of the presented analysis and design procedure, a computer simulation and experiments have been performed.
A High-Efficiency, Auto Mode-Hop, Variable-Voltage, Ripple Control Buck Converter
Rokhsat-Yazdi, Ehsan ; Afzali-Kusha, Ali ; Pedram, Massoud ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 115~124
DOI : 10.6113/JPE.2010.10.2.115
In this paper, a simple yet efficient auto mode-hop ripple control structure for buck converters with light load operation enhancement is proposed. The converter, which operates under a wide range of input and output voltages, makes use of a state-dependent hysteretic comparator. Depending on the output current, the converter automatically changes the operating mode. This improves the efficiency and reduces the output voltage ripple for a wide range of output currents for given input and output voltages. The sensitivity of the output voltage to the circuit elements is less than 14%, which is seven times lower than that for conventional converters. To assess the efficiency of the proposed converter, it is designed and implemented with commercially available components. The converter provides an output voltage in the range of 0.9V to 31V for load currents of up to 3A when the input voltage is in the range of 5V to 32V. Analytical design expressions which model the operation of the converter are also presented. This circuit can be implemented easily in a single chip with an external inductor and capacitor for both fixed and variable output voltage applications.
Isolated Topologies of Switched-Resonator Converters
Jabbari, Masoud ; Farzanehfard, Hosein ; Shahgholian, Ghazanfar ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 125~131
DOI : 10.6113/JPE.2010.10.2.125
Switched-resonator converters are a new family of soft switching DC-DC converters where the energy is transferred via a resonator. This paper introduces some isolated topologies of this family. The achieved advantages include, load independent soft-switching, self short-circuit protection, and optimization capability due to topology variety. Compared to conventional series-resonant converters, outstanding advantages such as a smaller fewer number of switches and diodes, a smaller transformer, and lower current stresses are achieved. A general synthesis scheme, functional topologies, and essential relations are included. Experimental results from a laboratory prototype confirm the presented theoretical analysis.
A Novel Interleaving Control Scheme for Boost Converters Operating in Critical Conduction Mode
Yang, Xu ; Ying, Yanping ; Chen, Wenjie ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 132~137
DOI : 10.6113/JPE.2010.10.2.132
Interleaving techniques are widely used to reduce input/output ripples and to increase the power capacity of boost converters operating in critical conduction mode. Two types of phase-shift control schemes are studied in this paper, the turn-on time shifting method and the turn-off time shifting method. It is found that although the turn-off time shifting method exhibits better performance, it suffers from sub-harmonic oscillations at high input voltages. To solve this problem, an intensive quantitative analysis of the sub-harmonic oscillation phenomenon is made in this paper. Based upon that, a novel modified turn off time shifting control scheme for interleaved boost converters operating in critical conduction mode is proposed. An important advantage of this scheme is that both the master phase and the slave phase can operate stably in critical conduction mode without any oscillations in the full input voltage range. This method is implemented with a FPGA based digital PWM control platform, and tests were carried out on a two-phase interleaved boost PFC converter prototype. Experimental results demonstrated the feasibility and performance of the proposed phase-shift control scheme.
Design and Application of a Single Phase Multilevel Inverter Suitable for using as a Voltage Harmonic Source
Beser, Ersoy ; Arifoglu, Birol ; Camur, Sabri ; Beser, Esra Kandemir ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 138~145
DOI : 10.6113/JPE.2010.10.2.138
This paper presents a single phase multilevel inverter for using as a voltage harmonic source. First, a single phase multilevel inverter system is presented and the structural parts of the inverter are described. In order to obtain multilevel output voltage waveforms, a switching strategy based on calculating switching angles is explained and an improved formula for determining switching angles is given. Simulation and experimental results of multilevel voltage waveforms are given for 15, 31 and 127 levels. The proposed topology does not only produce output voltages with low THD values. It also produces the required harmonic components on the output voltage. For this purpose, equations for switching angles are constituted and the switching functions are obtained. These angles control the output voltage as well as provide the required specific harmonics. The proposed inverter structure is simulated for various functions with the required harmonic components. The THD values of the output voltage waves are calculated. The simulated functions are also realized by the proposed inverter structure. By using a harmonic analyzer, the harmonic spectrums, which belong to the output voltage forms, are found and the THD values are measured. Simulation and experimental results are given for the specific functions. The proposed topology produces perfectly suitable results for obtaining the specific harmonic components. Therefore, it is possible to use the structure as a voltage harmonic source in various applications.
Current-Type Nine-Switch Inverters
Dehghan, Seyed Mohammad ; Mohamadian, Mustafa ; Yazdian, Ali ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 146~154
DOI : 10.6113/JPE.2010.10.2.146
In this paper two dual output current-type inverters are proposed. These inverters have been called a current source nines-witch inverter and a current-type z-source nine-switch inverter by the authors. The proposed inverters have two independent current source outputs. Compared to two independent current source inverters, the proposed converters are implemented with fewer semiconductor switches. Space vector modulation (SVM) is proposed for these converters. Simulation results show the validity and performance of the proposed inverters.
Dual Vector Control Strategy for a Three-Stage Hybrid Cascaded Multilevel Inverter
Kadir, Mohamad N. Abdul ; Mekhilef, Saad ; Ping, Hew Wooi ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 155~164
DOI : 10.6113/JPE.2010.10.2.155
This paper presents a voltage control algorithm for a hybrid multilevel inverter based on a staged-perception of the inverter voltage vector diagram. The algorithm is applied to control a three-stage eighteen-level hybrid inverter, which has been designed with a maximum number of symmetrical levels. The inverter has a two-level main stage built using a conventional six-switch inverter and medium- and low- voltage three-level stages constructed using cascaded H-bridge cells. The distinctive feature of the proposed algorithm is its ability to avoid the undesirable high switching frequency for high- and medium- voltage stages despite the fact that the inverter's dc sources voltages are selected to maximize the number of levels by state redundancy elimination. The high- and medium- voltage stages switching algorithms have been developed to assure fundamental switching frequency operation of the high voltage stage and not more than few times this frequency for the medium voltage stage. The low voltage stage is controlled using a SVPWM to achieve the reference voltage vector exactly and to set the order of the dominant harmonics. The inverter has been constructed and the control algorithm has been implemented. Test results show that the proposed algorithm achieves the desired features and all of the major hypotheses have been verified.
A Comparative Study of Controllers for CSI Fed Induction Motor
Kumar, Piush ; Agarwal, Vineeta ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 165~170
DOI : 10.6113/JPE.2010.10.2.165
This paper presents a comparative study of P and PI controllers for a current source inverter (CSI) fed induction motor drive system. A dq model has been used which incorporates the induction motor and the inverter power supply with current feedback. The model is used first to generate the steady state curves to determine the operating point through computer simulations using the software package MATLAB. Then a transient analysis has been carried out for different values of the speed and current controller parameters. The controller value is adjusted by the Ziegler-Nichols method. It has been observed that the transient time to reach the steady state value is larger with the PI controller than with the P controller.
PMSM Position Control with a SUI PID Controller
Abu El-Sebah, Mohamed I. ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 171~175
DOI : 10.6113/JPE.2010.10.2.171
This paper introduces the application of a SUI PID controller for permanent magnet (PM) drive systems. The drive system model is developed via FO control. Simulation of the system is carried out to predict the performance at no load and under load. The results and comparisons indicate that application of a SUI PID controller is effective for sensorless PM drive systems.
Active Cancellation of PMSM Torque Ripple Caused by Magnetic Saturation for EPS Applications
Lee, Geun-Ho ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 176~180
DOI : 10.6113/JPE.2010.10.2.176
This paper deals with a control method to reduce the torque ripple of a permanent magnet synchronous motor (PMSM) for electric power steering (EPS) systems. Such an application requires a very low torque ripple in order to maintain a good steering feel. However, because of spatial limitations, it cannot help having a partial saturation in the iron core of the PMSM for an EPS system, and this saturation results in a significant torque ripple. Thus, this paper analyzes the torque ripple caused by the magnetic saturation of a PMSM and proposes a method with respect to inductance measurement to verify the partial saturation. In addition, it is shown that a compensation current is needed in order to minimize the torque ripple when a PMSM is driven in the high torque region. The estimation process of the current and the torque ripple decreased by the current are presented and verified with test results.
SOC Estimation Based on OCV for NiMH Batteries Using an Improved Takacs Model
Windarko, Novie Ayub ; Choi, Jae-Ho ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 181~186
DOI : 10.6113/JPE.2010.10.2.181
This paper presents a new method for the estimation of State of Charge (SOC) for NiMH batteries. Among the conventional methods to estimate SOC, Coulomb Counting is widely used, but this method is not precise due to error integration. Another method that has been proposed to estimate SOC is by using a measurement of the Open Circuit Voltage (OCV). This method is found to be a precise one for SOC estimation. In NiMH batteries, the hysteresis characteristic of OCV is very strong compared to other type of batteries. Another characteristic of NiMH battery to be considered is that the OCV of a NiMH battery under discharging mode is lower than it is under charging mode. In this paper, the OCV is modeled by a simple method based on a hyperbolic function which well known as Takacs’s model. The OCV model is then used for SOC estimation. Although the model is simple, the error is within 10%.
Development of a Thermoelectric Cooling System for a High Efficiency BIPV Module
Choi, Jung-Sik ; Ko, Jae-Sub ; Chung, Dong-Hwa ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 187~193
DOI : 10.6113/JPE.2010.10.2.187
This paper proposes a cooling system using thermoelectric elements for improving the output of building integrated photovoltaic (BIPV) modules. The temperature characteristics that improve the output of a BIPV system have rarely been studied up to now but some researchers have proposed a method using a ventilator. The efficiency of a ventilator depends mainly on the weather such as wind, irradiation etc. Because this cooling system is so sensitive to the velocity of the wind, it is unable to operate in the nominal operating cell temperature (NOCT) or the standard test condition (STC) which allow it to generate the maximum output. This paper proposes a cooling system using thermoelectric elements to solve such problems. The temperature control of thermoelectric elements can be controlled independently in an outdoor environment because it is performed by a micro-controller. In addition, it can be operated around the NOCT or the STC through an algorithm for temperature control. Therefore, the output of the system is increased and the efficiency is raised. This paper proves the validity of the proposed method by comparing the data obtained through experiments on the cooling systems of BIPV modules using a ventilator and thermoelectric elements.
An Improved Control Strategy Using a PI-Resonant Controller for an Unbalanced Stand-Alone Doubly-Fed Induction Generator
Phan, Van-Tung ; Lee, Hong-Hee ; Chun, Tae-Won ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 194~202
DOI : 10.6113/JPE.2010.10.2.194
The main cause of degradation in an unbalanced stand-alone doubly-fed induction generator (DFIG) system is negative sequence components that exist in the generated stator voltages. To eliminate these components, a hybrid current controller composed of a proportional-integral controller and a resonant regulator is developed in this paper. The proposed controller is applied to the rotor-side converter of a DFIG system for the purpose of compensating the negative stator voltage sequences. The proposed current controller is implemented in a single positive rotating reference frame and therefore the controller can directly regulate both the positive and negative sequence components without the need for sequential decomposition of the measured rotor currents. In terms of compensation capability and accuracy, simulations and experimental results demonstrated the excellent performance of the proposed control method when compared to conventional vector control schemes.
Three-Phase Line-Interactive Dynamic Voltage Restorer with a New Sag Detection Algorithm
Jeong, Jong-Kyou ; Lee, Ji-Heon ; Han, Byung-Moon ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 203~209
DOI : 10.6113/JPE.2010.10.2.203
This paper describes the development of a three-phase line-interactive DVR with a new sag detection algorithm. The developed detection algorithm has a hybrid structure composed of an instantaneous detector and RMS-variation detectors. The source voltage passes through the sliding-window DFT and RMS calculator, and the instantaneous sag detector. If an instantaneous sag is detected, the RMS variation detector-1 is selected to calculate the RMS variation. The RMS variation detector-2 is selected when the instantaneous sag occurs under the operation of the RMS variation detector-1. The feasibility of the proposed algorithm is verified through computer simulations and experimental work with a prototype of a line-interactive DVR with a 3kVA rating. The line-interactive DVR with the proposed algorithm can compensate for an input voltage sag or an interruption within a 2ms delay. The developed DVR can effectively compensate for a voltage sag or interruption in sensitive loads, such as computers, communications equipment, and automation equipment.
Design Considerations of a Lithium Ion Battery Management System (BMS) for the STSAT-3 Satellite
Park, Kyung-Hwa ; Kim, Chol-Ho ; Cho, Hee-Keun ; Seo, Joung-Ki ;
Journal of Power Electronics, volume 10, issue 2, 2010, Pages 210~217
DOI : 10.6113/JPE.2010.10.2.210
This paper introduces a lithium ion battery management system (BMS) for the STSAT-3 satellite. The specifications of a lithium ion battery unit are proposed to supply power to the satellite and the overall electrical and mechanical designs for a lithium ion battery management system are presented. The structural simulation results will be shown to confirm the behavior of both the BMS and the cells.