COMPUTER에서 SWITCHIG函數를 使用한 3相 INVERTER SIMULATION에 關한 硏究

韓運東 忠州大學校 1994 한국교통대학교 논문집 Vol.29 No.2

Static power converters can be analyzed by means of widely avriable circuit simulation software packages such as PSPICE. However, they are usually modeled as a set of real switch, which results in long execution times and possible convergence problems in the case of complex circuit. This paper proposes macromodels to simulate three-phase power converter on such package. The proposed macromodels are based on converter switching functions rather than actual circuit configuration, and they are suited for steady of state and large signal transient analysis at system level. In this approach, voltage sourceinverters (VSI) are simulated as multiport network avoiding the physical nonlinear micromodels of the power switchs.

SPICE Simulation을 利用한 UPS의 設計와 應用에 關한 硏究

韓運東 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.1

In this paper the well known simulation software package PSPICE "Electrical Circuit Simulation" is used to simulate the performance of an on-line UPS system under steady state and transient operation conditions. The steady state operation of the UPS system includes its normal as well as its standby operation. The transient operation is simulated for different cases, namely, transient from normal to standby condition and vice-versa, in the normal supply, the application of a sudden short circuit in some battery cells, and the application of a sudden load or short circuiting the load.

HVDC System용 승압형 Converter설계에 관한 연구

한운동 忠州大學校 2011 한국교통대학교 논문집 Vol.46 No.-

Switching technique in conventional HVDC transmission system depends on line-commutation of the high power semiconductor switches with fast turn-off capability from the gate, such as Gate turn-off switches(GTO’s). The boost type SVPWM converter has very useful characteristics. One of the main objective of this paper is to show that the useful characteristics is applicable to improve the operation capabilities of the HVDC station. In this study, the boost type SVPWM converters exercise direct control over the voltage amplitude, the voltage angle, and the frequency. the proposed system improved that the SVPWM inverter with the force-commutated in HVDC system is very useful and the feasible system.

CPLD를 利用한 電力變換用 專用칩 開發에 關한 硏究

韓運東,林炳國 충주대 2001 한국교통대학교 논문집 Vol.35 No.2

The use of HDL(Hardware Description Language) is now central to the ASIC(Application Specific Integrated Circuit).HDL-based ASIC can simplify the process of development and has a competition in market because it reduce the consuming time for the design of IC(Integrated circuit) in system level.Therefore, the development of power electronics system on chip (SOC), to design microcontroller and switching logic as one chip, is required extremely for the purpose of having reliability and low cost in power electronics which is based on switching elements.The major application of SOC is variable converter, active filter, inverter for induction motor, UPS and power supply with a view to reducing electromagnetic pollution.

전기자동차용 EDLC축전시스템의 제어 알고리즘 연구

한운동 忠州大學校 2012 한국교통대학교 논문집 Vol.47 No.-

Recently, in energy storage system, the EDLC is paid attention as a new environmentally friendly energy storage element. This capacitor has higher energy density than the electrolytic capacitor. Also, this capacitor has a lot of advantage such as no maintenance, longer life cycle and faster charge-discharge time than the battery system. But the EDLC must have a each charge-discharge controller to control high effective, a direct-parallel switching circuit to effectively use energy, and several compensation techniques to control a optimal operating.

有限要素法에 依한 磁界計算에 關한 硏究

韓運東 忠州大學校 1986 한국교통대학교 논문집 Vol.20 No.1

In this study, an application of Finite Element Method which in principle based variational calculus has been presented for the two-dimensional analysis of magemethic flux. The energy functional for nonlinear magnetostatic problems and for steady state sinusoidal induction problems are presented. One such functional is used to assemble a matrix equation for the magnetic vector potential. Boundary conditions and matrix solution techniques are as well as postprocessing to obtain various electromagnetic parameters. Finally a sychronous motor analysis is presented as a typical application.

Solid-static Switching device를 使用한 電力 品質改善에 關한 硏究

韓運東 충주대 산업과학기술연구소 2001 産業科學論文集 Vol.9 No.-

Utility distribution networks, sensitive industrial loads, and critical commercial operations all suffer from various types of outages and service interruptions which can cost significant financial loss per incident based on process down-time, lost production, idle work forces, and other factors. The types of interruption which are experienced can generally be classified as power quality related problems caused by voltage sag and swells, lightning strikes, and other distribution system related disturbances. In many instances, the use of a Solid-State Transfer Switch(SSTS) and or a Distribution Level Static Compensator(D-STATCOM) can be som of the most cost-effective solutions for these types of power quality problems. The SSTS, which essentially consists of a pair of thyristor switch devices, enables seamless transfer of energy from a primary source to an alternate source in order to avoid service interruption upon a deficiency in power quality. The D-STATCOM, which consists of a thyristor-based voltage source inverter, uses advanced power electronics to provide voltage stabilization, flicker suppression, power factor correction, harmonic control, and a host of other power quality solutions for both utility and industrial applications.

特定高調波 除去方式에 依한 交流 制御用 Inverter 硏究

韓運東,池平植 충주대 2004 産業科學論文集 Vol.12 No.-

In electrical industry, development of inverter technique make to control AC motor precisely. So the using inverter spreads fast. The motor using inverter has high efficiency, characteristic of constant torque, output and etc. However, in spite of many good things of using inverter, VS-Motor is used widely because of simple control and cheap cost. VS-Motor is speed control method using eddy-current coupling. This method installs eddy-current coupling with constant speed driving induction motor and controls rotating speed through a charging change of a excitation current, particularly. But this method has large losses and low efficiency because of heating as slip drum in low speed region. In cooling, addition of a mechanical devices is difficult and in volume, large space is occupied. Using SCR for control, efficiency of system is low. In case of inverter, though advantage of high efficiency and high performance the price is expensive. Therefore, in this study, we developed VVVF Inverter system for controlling AC power. A using micro-controller can make the price down and it has many devices so it can be expected the system's compact and low noise effect.

DVR用 인버터 필터의 設計 및 分析

한운동 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-

The role of the inverter-side filter used in the dynamic voltage restorer (DVR) is examined. Using circuit analysis method, it is shown that the selection of the filter parameters can affect the DVR inverter rating. Furthermore, with the DVR filter-series injection transformer combination, the loading effect of the filter on the restorer and the primary supply system has been quantified under normal as well as voltage sag conditions. A systematic filter design method is then proposed, the primary objective of which is to achieve specific harmonic performance while ensuring that the DVR inverter rating and the loading effect are minimized. Illustrative examples are also included.

고압방전램프용 전자식 안정기의 에너지 절약형 설계

한운동 忠州大學校 2009 한국교통대학교 논문집 Vol.44 No.-

In this study, PI current controller was designed to control high frequency resonant ballast for high voltage discharge lamps. To get power modulation and spectrum diffusion effect with PWM and pulse width modulation of lamp current, 200[Hz] of low frequency signal was applied to input of current controller. Also, arc stability was investigated according to frequency of modulation wave and modulation rate. electronic ballast for 250[W] high voltage discharge lamp was manufactured. proposed pulse width modulation reduce acoustic resonance and usefulness of designed controller was confirmed.