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EMTDC를 이용한 D-STATCOM의 전압제어 효과분석
전영수(Y.S. Jeon),박상호(S.H. Park),김수열(S.Y. Kim),이재욱(J.W. Lee),곽노홍(N.H. Kwak),추진부(J.B Choo) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
고도화 정보화시대의 도래로 수용가측의 전력품질에 대한 관심이 나날이 높아지고 있고, 전원 품질에 의한 경제적 피해가 늘어나면서 중요 부하 및 계통을 보호하기 위한 전력품질 보상기기 개발에 대한 연구가 활발히 진행되고 있다. 대표적인 전력품질 향상기기로는 D-STATCOM, DVR, SSTS 등이 있다.
연료분무 및 연소 1 : 밸브리프트 변화에 따른 연소실내 흡기유동 및 연료분포에 대한 수치 해석적 연구
전영수 ( Y S Jeon ),송미지 ( M J Song ),이성욱 ( S W Lee ),김경배 ( K B Kim ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
While variable valve actuation or variable valve lift (VVL) is used increasingly in spark ignition (SI) engines to improve the volumetric efficiency or to reduce the pumping losses, it is necessary to understand the impact of variable valve lift and timing on the in-cylinder gas motions and mixing processes. In this paper, characteristics of the in-cylinder flow and fuel distribution for various valve lifts(4, 6, 8, 10mm) were simulated in a GDI engine. It is expected that the investigation will be helpful in understanding and improving GDI combustion when a VVL system is used. The CFD results showed that a increased valve lift could significantly enhance the mixture and in-cylinder tumble motion because of the accelerated air flow. Also, it can be found that the fuel distribution is more affected by earlier injection (during intake process) than that of later injection (end of compression). These may contribute to an improvement in the air-fuel mixing but also to an optimization of intake and exhaust system.
A Study on the Application of the DVR System using EMTDC Simulation
최영도(Y. D. Choy),곽노홍(N. H. Kwak),전영수(Y. S. Jeon),전동훈(D. H. Jeon) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
Recently, the interest on power quality has been hot issue because the equipments cause voltage disturbance and become more sensitive to the voltage disturbance. The DVR(Dynamic Voltage Restorer) is one of the Custom Power Device that can compensate the voltage. DVR operates as a series connected compensator whose output voltage can be controlled system voltage. And the magnitude of compensation voltage is limited by the characteristics of system and load. Compensation capability of DVR was simulated by EMTDC under several condition. This paper analyzed effect of DVR's compensation at power quality test center which has SSFG(Sag, swell, and Flicker Generator, CPDs(SSTS, DVR, DSTATCOM), and loads.