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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Power Electronics
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
Editor in Chief :
Volume & Issues
Volume 5, Issue 4 - Oct 2005
Volume 5, Issue 3 - Jul 2005
Volume 5, Issue 2 - Apr 2005
Volume 5, Issue 1 - Jan 2005
Selecting the target year
Analysis of an AC/DC Resonant Pulse Power Converter for Energy Harvesting Using a Micro Piezoelectric Device
Chung Gyo-Bum ; Ngo Khai D.T. ;
Journal of Power Electronics, volume 5, issue 4, 2005, Pages 247~256
In order to harvest power in an efficient manner from a micro piezoelectric (PZT) device for charging the battery of a remote system, a new AC/DC resonant pulse power converter is proposed. The proposed power converter has two stages in the power conversion process. The first stage includes N-type MOSFET full bridge rectifier. The second stage includes a boost converter having an N-type MOSFET and a P-type MOSFET. MOSFETs work in the
quadrant region. A small inductor for the boost converter is assigned in order to make the size of the power converter as small as possible, which makes the on-interval of the MOSFET switch of the boost converter ultimately short. Due to this short on-interval, the parasitic junction capacitances of MOSFETs affect the performance of the power converter system. In this paper, the performance of the new converter is analytically and experimentally evaluated with consideration of the parasitic capacitance of switching devices.
Development of Airborne High Density High Voltage Power Supply for Traveling Wave Tubes
Park Young-Ju ;
Journal of Power Electronics, volume 5, issue 4, 2005, Pages 257~263
This paper describes the development and testing results of a high density High Voltage Power Supply (HVPS) that drives microwave Traveling Wave Tubes (TWTs) of phased array transmitters for airborne EW systems. The HVPS is designed to consist of a number of modules connected in series. Among them, especially, the high-density pulse transformer module including the resonant circuit is newly designed to make the HVPS much more reliable. In addition, this paper describes the development of high voltage solid-state modulation using fast switching devices (FETs) and also represents the test results of a modulator module.
Suppression Method for Torque Ripple of PM Synchronous Motor
Yonezawa Hiroyuki ; Taniguchi Katsunori ; Lee Hyun Woo ;
Journal of Power Electronics, volume 5, issue 4, 2005, Pages 264~271
A new modified trapezoidal modulating signal for a pulse width modulation (PWM) inverter suitable for a permanent magnet synchronous motor (PMSM) drive is proposed in this paper. A new modulating signal for the PMSM drive is determined by the characteristic torque ripple of the motor with various electro-motive force (EMF). The proposed modulating signal is able to decrease the torque ripple even if the motor has sinusoidal EMF or non-sinusoidal EMF. By using the proposed modulating signal, the system reduced the torque ripple as well as achieved the effective utilization of the DC supply voltage for the inverter. Many improvements are accomplished by the PWM strategy adapting the modified trapezoidal modulating signal without a change in hardware.
A New Control Scheme for a Class-D Inverter with Induction Heating Jar Application by Constant Switching Frequency
Choi Won-Suk ; Park Nam-Ju ; Lee Dong-Yun ; Hyun Dong-Seok ;
Journal of Power Electronics, volume 5, issue 4, 2005, Pages 272~281
In this paper, a simple power control scheme for a constant frequency Class-D inverter with a variable duty cycle is proposed. It is more suitable and acceptable for high- frequency induction heating (IH) jar applications. The proposed control scheme has the advantages of not only wide power regulation range but also ease of control output power. Also it can achieve a stable and efficient Zero-Voltage-Switching (ZVS) in a whole load range. The control principles of the proposed method are described in detail and its validity is verified through simulated and experimental results on 42.8kHz IGBT for induction heating rated on 1.6kW with constant frequency variable power.
Simultaneous Estimation of Rotor Speed and Rotor Resistance of an Induction Motor Using Variable Rotor Flux
Lee Zhen-Guo ; Jeong Seok-Kwon ;
Journal of Power Electronics, volume 5, issue 4, 2005, Pages 282~288
In this paper, a new speed sensorless induction motor scheme which can estimate rotor speed and rotor resistance simultaneously is presented. The rotor flux with a low frequency sinusoidal waveform is used to conduct on-line simultaneous estimation of the rotor speed and rotor resistance. Hence the proposed sensorless control method is robust to rotor resistance variations. Also, the control scheme has no current minor loop to determine voltage references. It contributes to good control performance at low speeds. Some simulation results supported by experiments are given to show the effectiveness of this method.
Induction Generator Using PWM Converter and Its Small-Scale Power Applications to Variable-Speed Renewable-Energy Generation
Ahmed Tarek ; Nishida Katsumi ; Nakaoka Mutsuo ;
Journal of Power Electronics, volume 5, issue 4, 2005, Pages 289~304
This paper describes a simple control structure and power conditioning system for an indirect vector controlled stand-alone induction generator (IG) used to operate under variable speed. The required reactive power for the IG system is supplied by means of a capacitor bank and a voltage-source PWM converter. Using a capacitor bank to transfer the reactive power to the IG under the rated speed and no-load conditions starts the IG operation and reduces the PWM converter size. The vector control structure for the variable speed IG power conditioning system compensates for changes in the electrical three-phase and DC loads while considering the magnetizing curve of the IG. The vector control structure is developed to regulate the DC link voltage of the PWM converter and the IG output voltage. The experimental and simulated performance results of the IG power conditioning system at various speeds and loads are given and show that this proposed scheme can be used efficiently for a variable speed, wind energy conversion system.
Development of a Welding Machine System Using Brown Gas by Improved Water Electrolyzation
Lee Yong-Kyun ; Lee Sang-yong ; Jeong Byung-Hwan ; Mok Hyung-Soo ; Choe Gyu-Ha ;
Journal of Power Electronics, volume 5, issue 4, 2005, Pages 305~311
Throughout the world, studies on the water energization are currently under way. Of those, Brown gas, which is generated through the electrolyzation of water and is a mixed gas of the constant volume of 2 parts hydrogen to 1 part oxygen, has better characteristics in terms of economy, energy efficiency, and environmental affinity than those of acetylene gas and LPG (Liquefied Petroleum Gas) used for existing welding machines. This paper analyzes the characteristics of Brown gas and presents methods for increasing the generating efficiency of Brown gas by designing a power supply to deliver power to a water-electrolytic cell and designing a cylindrical electrode to improve the efficiency of the electrolyzer needed for water electrolyzation. Based on the above the methods, a welding machine using Brown gas is developed. And the generation efficiency of Brown gas is measured tinder different conditions (duty ratio, frequency and amplitude) of supplied power.
A Compensator for Lateral Current Reduction Applied to Autonomously Controlled UPSs Connected in Parallel
Sato Kazuhide Kazuhide ; Kawamura Atsuo ;
Journal of Power Electronics, volume 5, issue 4, 2005, Pages 312~318
This paper presents a compensator for reduction of the reactive lateral current in multiple autonomously controlled uninterruptible power supplies (UPS) connected in parallel. This compensator acts directly on the control equation for voltage amplitude and it provides an improved current distribution especially in the case of parallel connection of UPSs with different output power ratings. Observations show that the original control equation for output voltage amplitude is efficient for voltage regulation but it causes great variation of voltage levels. A compensator with the same structure is added to counterbalance the variation caused by the original control equation. Simulations show promising results with the employment of the proposed compensator. Our simulations are confirmed by experimental results using three UPSs with different output ratings and voltage limiters (
) connected in parallel under various conditions.
A Dynamic Performance Study of an HVDC System using a Hybrid Simulator
Kim Chan-Ki ; Yang Byeong-Mo ; Lee Hahk-Sung ;
Journal of Power Electronics, volume 5, issue 4, 2005, Pages 319~328
This paper deals with the development of a new type of simulator for the study of the dynamic performance of an HVDC scheme. The new simulator uses a digital model of the power equipment and an analogue model of the existing HVDC controller. This simulator is used to study the dynamic performance of the Cheju - Haenam HVDC system and to verify the control characteristics of the HVDC system. The paper discusses the simulator development requirements and criteria. The paper provides guidelines for the development of the simulator and presents the results of the simulation studies.
Analysis of Voltage Regulation by DSTATCOM - Using the EMTDC Program
Jeon Young-Soo ; Kwak No-Hong ; Choo Jin-Boo ;
Journal of Power Electronics, volume 5, issue 4, 2005, Pages 329~334
The DSTATCOM(Distribution Static Synchronous Compensator) is one of the Custom Power Devices that can regulate voltage. The DSTATCOM operates as a shunt connected static var compensator whose capacitive or inductive output current can be controlled independent of the system voltage. The magnitude of the compensated voltage is limited by characteristics of the system and the load. Compensation capability of the DSTATCOM which can inject 1 MVAR reactive power was simulated by EMTDC under several conditions. This paper analyzes the effect of the DSTATCOM's compensation considering the length and kind of distribution line, the power factor and magnitude of the load, and the duration and magnitude of the voltage variation.