U.D.F.형 가변 주파수 전력 변환기의 구성과 동작 특성에 관한 연구

金光泰(Kwang-Tae Kim),金喆禹(Cheul-U Kim),曺井守(Jung-Soo Cho) 대한전기학회 1993 전기학회논문지 Vol.42 No.4

마이크로프로세서를 이용한 3상 5레벨 PWM 인버어터에 관한 연구

金喆禹,金龍雄 부산대학교 공과대학 1985 硏究報告 Vol.30 No.-

Three phase 5-level PWM inverter using z-80 microprocessor is described. Microprocessor is used to generate reference wave and carrier wave, and to compute switching points for PWM patterns. By variation of modulation index M and frequency ratio R, inverter's output voltage is controlled in the real time. Harmonic components are analyzed theorically and experimentally. The experimental results agree with the theorical value and CVCF operation is suitable at the modulation index M=1.3~2.0.

[논문]직렬형 2배수 권선비 변압비를 이용한 HBML PWM 인버터

고희영,김철우 釜山大學校生産技術硏究所 2005 生産技術硏究所論文集 Vol.64 No.-

본 논문에서는 고조파를 저감하고 출력 파형을 개선하기 위하여 H-Bridge 인버터와 변압기 조합을 이용한 다중레벨 인버터를 구성함에 있어 변압기 출력 전압의 조합을 이용한 새로운 하이브리드형 멀티레벨 인버터를 제안한다. 제안한 다중 레벨 인버터는 THD을 저감하기 위해 변압기의 권션비가 1배,2배,4배인 3대를 사용하여 출력전압을 기존의 9 레벨에서 15 레벨로 증가 하였다. 또한 PWM 인버터 스위칭 패턴을 변경하여 스위칭 소자수를 10개에서 8개로 저감하고,변압기를 4개에서 3개로 저감할 수 있는 방법을 제안한다. 제안된 다중레벨 PWM 인버터의 전력회로 및 제어신호의 타당성을 입증하기 위해 프로토 타입 15레벨 언버터에 대하여 실험을 행하였다.

온천폐수를 이용한 급탕용 축열식 히트펌프 시스템 분석

백남춘,신우철 대한건축학회 2003 대한건축학회논문집 Vol.19 No.4

In this study, the compression type heat pump system using hot spring wastewater, as a heat source, from hotel with sauna was designed and analysed. This system for hot-water supply is composed of heat pump, hot water storage tank, wastewater storage tank, wastewater cleaning bed, etc.. The charging process of heat into the hot water storage tank is achieved only at night time using peak-off electricity. The system design was focussed not only to increase COP but also to use the peak-off electricity. TRNSYS was used for the system simulation and new component for the heat pump was made. As a result, it was forecasted that the yearly mean COP of heat pump is about 4.8 and heat pump can supply 100% of hot water load except winter season weekend. The important thing that should be considered is to decrease the temperature difference between condenser and evaporator during the charging process of heat pump.

電磁機械의 磁氣非線形性의 測定과 等價回路의 表現法

高羲石,金喆禹 慶南大學校 附設 工業技術硏究所 1983 硏究論文集 Vol.1 No.-

본 논문에서 제시하는 실험법은 삼각파 전류를 이용하여 CRT에서 전류와 인덕턴스의 관계궤적을 간단히 나타내는 과정을 제시한 것이다. 이 방법의 이점은 철심에서 포화, 히스테리시스, 와전류를 고려했을때, 電磁機械에 대한 등가회로의 파라메터를 계산하는 방법을 제시한다. An experimetal method proposed in this paper, the triangular current test furnishes a straightforward procedure for the display of the current-inductance locus on a C. R. T. The effectiveness of this method is shown in the evaluation of equivalent electric circuit parameters for the electromechanical machine with the saturation, hystersis and the eddy current in the magnetic core.

병원건물의 에너지소비 특성에 관한 사례연구

임득환,신우철 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

Although hospitals have been known as buildings which consume a lot of energies, the domestic research concerned with this has not been reported to our knowledge. Therefore this study was performed to investigate the energy consumption and characteristics in hospital building. Simulation model was developed by the detailed building energy software, DOE-2 and the validity was verified through the daily measured date. It was found from results that the hospital spent an average of 340 Mcal per square meters annually. And the hot water represented about 40 percent of total energy use, and fan power and heating/cooling energy were next order.

스위치드 릴럭턴스 전동기의 속도제어에 관한 연구

김창현,권영안,김철우 부산대학교 1994 生産技術硏究所論文集 Vol.47 No.

Switched reluctance motor has several advantages as a variable speed motor. This paper studies a speed control of SRM with widely slotted opto interrupter. A low resolution of the position sensor is compensated through additional counters. The variable structure system with feedforward control and PI control of turn on angle and turn off angle is proposed as a control method. This control method is verified through the experiment in this paper. 스위치드 릴럭턴스 전동기(SRM)는 제작의 용이성, 구동회로의 안정성등 여러가지 장점으로 가변속 전동기로서 많은 주목을 받고 있다. 본 논문에서는 위치센서로서 광폭 광센서를 사용하는 SRM의 속도제어에 관하여 연구한다. 저 해상도의 위치신호는 카운터 보조회로를 부가하여 보상하였고, 속도제어방식으로는 점호각과 소호각을 피드포워드제어 또는 PI제어를 수행하는 가변구조 시스템으로써 응답속도 및 속도추종 성능이 양호하게 이루어지는 제어알고리즘을 제시하였다. 또한 본 연구에서 SRM 구동시스템을 제작하고 실험을 통하여 본 제어알고리즘의 우수성을 입증하였다.

인덕턴스 추론기법에 의한 SRM의 센서리스 제어

권혁운,최서익,김철우 부산대학교 생산기술연구소 2001 生産技術硏究所論文集 Vol.60 No.-

본 논문은 SRM의 회전자 위치 정보를 얻는 새로운 방법을 제시하였다. 회전자의 위치에 따라 인덕턴스가 변화함을 이용하며 비여자상의 펄스 전류, 펄스 전압를 측정하고 인덕턴스를 측정하여 위치를 예측한다. Micro-processor는 비여자상을 결정하고 테스트 결과는 SRM의 센스리스 제어가 가능함을 보여주고 있다. This paper describes a new methods of detecting rotor position in SRM (switched reluctance motor). A low-cost position-sensing scheme using stator inductance measurement is presented in this paper. An analog electronic technique can be applied to measure the inductance of a nonconducting phase by measuring phase current and pulse voltage. Micro-processor is decided to the nonconducting phase. Test results show that this technique is a possible approach to detect the rotor position of an SRM.

냉 · 난방 및 조명에너지를 통합 고려한 DSSC BIPV창호의 사무소건물 적용 효과 연구

심세라(Sim Se-Ra),윤종호(Yoon Jong-Ho),신우철(Shin U-Cheul) 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.3

The aim of this study is to evaluate how much would the building energy consumption be saved by applying DSSC BIPV window which is possible to control the transmittance and express the color in the office building. For this, physical characteristics such as transmittance and reflectance, U-factor of DSSC are analyzed and an annual energy consumption that is connected to dimming control is calculated when DSSC BIPV window is applied by alternate clear window system. As a result, It is possible to reduce the an annual energy consumption as much as 4.1% by just change the clear double window system to DSSC BIPV double window system because the major factor to reduce energy consumption in the office that has much cooling load than other building is SHGC. When the thermal insulation properties of DSSC BIPV window with low-e coating and making triple window are improved, energy saving ratio is about 9%. Plus, energy saving ratio of 25~28% in lighting energy consumption is possible when the dimming control system with DSSC BIPV window is adopt.

사무소 건물의 창호에너지소비효율등급제 적용성 평가

이수만(Soo Man Lee),김동윤(Dong Yun Kim),안정혁(Jung Hyuk An),이철성(Cheol Seng Lee),신우철(U Cheul Shin) 대한설비공학회 2019 설비공학 논문집 Vol.31 No.10

In this study, we analyzed the annual heating and cooling energy requirements of reference building with 97 certificated windows using TRNSYS 17, to review the applicability of the “Window Energy Consumption Efficiency Rating System” to the office building. The analyzed model was a medium-size office building with lightweight curtain walls and a window-to-wall ratio of 52%. The results are as follow : First, the annual total thermal load was 60,261 to 111,616 kWh and the ratio of heating load to cooling load was 1:9 showing that cooling was the main factor of the thermal load. Second, the total thermal load by SHGC showing an almost perfect linear relationship. The F-test significance probability in the regression model was 0.000 meaning statistical significance and the coefficient of determination was 0.9656 showing high correlation. In contrast, the F-test significance probability in the regression model by U-value was 0.00484 showing statistical significance but the coefficient of determination was 0.0805 showing low correlation. Third, the SHGC of window was the main factor of the total thermal load in the office building. It showed the limitation of subject in “Window Energy Consumption Efficiency Rating System” which was limited to insulation performance and airtight performance. Thus, in to evaluate the window sets in terms of energy saving, the “Window Energy Consumption Efficiency Rating System” with SHGC should be considered.