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345kv 미금 변전소 외부 계통의 등가축약 기법을 이용한 EMTP 모델링에 관한 연구
권기진,정기석,서규석,Kwon, Ki-Jin,Jeong, Ki-Seok,Seo, Gyu-Seok 한국산업융합학회 2011 한국산업융합학회 논문집 Vol.14 No.3
EMTP-RV is the very powerful program to analyze the dynamic operation of the power system. To use this package in the large complex power system, it is very important to simplify the power system to simple equivalent network. In our study the 100 MVA STATCOM is placed at 345kV "MIGUM" which is the one of the 345kV substations of the Korean Electric Power System that is consist of more than 1000-bus. MIGUM substation is connected with 7 separated transmission lines to main Korean Electric power system. We developed a new method to simplify the network except the substation that we want to analysis. The power system outside the 345kV substation is modeled into the equivalent network. The loop network outside the substation can be modeled to simplified Thevenin equivalent network. The proposed method is applied to IEEE-14 Reliability Test System and the results shows the effectiveness of the method.
345㎸ 미금 변전소 외부 계통의 등가축약 기법을 이용한 EMTP 모델링에 관한 연구
권기진(Ki-Jin Kwon),정기석(Ki-Seok Jeong),서규석(Gyu-Seok Seo) 한국산업융합학회 2011 한국산업융합학회 논문집 Vol.14 No.3
EMTP-RV is the very powerful program to analyze the dynamic operation of the power system. To use this package in the large complex power system, it is very important to simplify the power system to simple equivalent network. In our study the 100 MVA STATCOM is placed at 345㎸ “MIGUM” which is the one of the 345㎸ substations of the Korean Electric Power System that is consist of more than 1000-bus. MIGUM substation is connected with 7 separated transmission lines to main Korean Electric power system. We developed a new method to simplify the network except the substation that we want to analysis. The power system outside the 345㎸ substation is modeled into the equivalent network. The loop network outside the substation can be modeled to simplified Thevenin equivalent network. The proposed method is applied to IEEE-14 Reliability Test System and the results shows the effectiveness of the method.
색차계를 이용한 색온도 산출 및 분광계와의 측정치 비교에 관한 연구
권기진(Ki Jin Kwon),박명구(Park Myoung Ku),박세일(Park Se Il),노경호(Kyung Ho Noh) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
The spectrophotometer of spectrum sensor type which enable to measure the correlated color temperature at wavelength is in general use for measuring correlated color temperature. However, this equipment is too expensive for normal laboratory to make a purchase. So, we are doing research on the alternative method for using filter type colorimeter that not only display color coordinate but relatively cheaper than spectrophotometer.
휴대용 열차접근경보장치에 적용되는 GPS모드와 RF모드의 거리 및 속도 분석
권기진(Ki Jin Kwon),온정근(Jung-Ghun Ohn),심재복(Jae-bock Shim),최영하(Choi Yung ha) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
A portable train approaching warning device can be used in order to reduce accidents of the workers on the rail, who are working without recognizing the approaching train, and to secure the safety of the workers. It can be installed in the train so that workers can recognize the approaching train. However, it is not easy to identify the location of the train precisely. In this study GPS and RF devices, which are used to calculate the location of the train were reviewed, to see how much error tolerance they have in the field, to analyze the distance for normal transmission between the receiver and transmitter, to verify the conformity of the portable train approaching warning device developed as a prototype model to the current rail system, and to provide the related fields with the analysis results to improve the existing or application technology. Additionally, test methods to locate the train were introduced and each test result was compared and analyzed.
열차속도에 따른 GPS형 열차접근경보기의 경보안정성 분석
권기진(Ki Jin Kwon),온정근(Jung-Ghun Ohn),심재복(Jae-bock Shim),최영하(Choi Yung ha) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
GPS type portable-alarm-system is composed of satellite receiving equipment, signal transmission equipment, etc. Time errors occur because of the processing methods of the satellite receiving equipment and signal generator, the positional error of GPS itself, etc. With the recent rise of train speed, it becomes very important to secure the stability of portable-alarm-system from time errors. The present study estimated errors caused by the structure of portable-alarm-system, GPS errors, etc., and verified them. In addition, it examined the effects of such errors on portable-alarm-system according to train speed.
공간 스캔과 구형 방식의 분광측정 시스템 색온도 측정치 비교 및 분석에 관한 연구
권기진(Ki Jin Kwon),박세일(Park Se Il),박명구(Park Myoung Ku),노경호(Kyung Ho Noh) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
So far luminaire product Correlated Color Temperature(CCT) has been measured through lamp measured value(whole spectrum). But when mesuring with LED luminaire which is developed integral type(lamp and luminaire), some problem is arising because of the measurement equipment size and method. Thus following thesis studied comparing CCT with sphere-spectroradiometer system and spectroradiometer spatially scanned and effectiveness of two measurement method.