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레이저를 이용한 얇은 원통형 튜브에서의 유도초음파 발생
김현묵,정경일,장경영,안형근,곽노권,이창목 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1
레이저를 이용하여 두께가 얇은 원통형 튜브에 유도초음파를 발생하고, 공기-결합 트랜스듀서를 이용하여 비접촉식으로 수신하였다. 원통형 튜브는 발전설비의 열교환기 및 증기발생기 튜브에 사용되는 인코넬(Inconnel)튜브이다. 레이저의 조사 경로에 선 배열 슬릿을 삽입하여 유도 초음파의 파장을 조절하였다. 파장이 일정할 때 발생되는 모드를 이론적인 분산선도로부터 예측하고, 예측된 위상속도로부터 공기-결합 트랜스듀서의 경사각을 결정하였다. 원통형 튜브에는 축대칭 모드가 지배적으로 발생하는 것으로 나타났다. 이러한 결과는 웨이블렛 변환에 의한 시간-주파수 선도와 이론적인 분산선도를 비교한 결과 증명되었다.
Hyun-Houng Kim,Chan-Joo Lee,Jong-Bae Park,Joong-Rin Shin,Sang-Yun Jeong 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.4
This paper presents a new numerical algorithm for the fault location estimation and arcing fault detection when a single-phase arcing ground fault occurs on a transmission line. The proposed algorithm derived in the spectrum domain is based on the synchronized voltage and current samples measured from the PMUs (Phasor Measurement Units) installed at both ends of the transmission lines. In this paper, the algorithm uses DFT (Discrete Fourier Transform) for estimation. The algorithm uses a short data window for real-time transmission line protection. Also, from the calculated arc voltage amplitude, a decision can be made whether the fault is permanent or transient. The proposed algorithm is tested through computer simulation to show its effectiveness.
Hyun-Houng Kim,Yun-Won Jeong,Chan-Joo Lee,Jong-Bae Park,Joong-Rin Shin 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.3
This paper presents a new two-terminal numerical algorithm for fault location estimation using the synchronized phasor in time-domain. The proposed algorithm is also based on the synchronized voltage and current phasor measured from the PMUs (Phasor Measurement Units) installed at both ends of the transmission lines. In this paper, the algorithm is given without shunt capacitance and with shunt capacitance using n -model and estimated using DFT (Discrete Fourier Transform) and LES (Least Error Squares Method). The algorithm uses a very short data window and classification for real-time transmission line protection. To verify the validity of the proposed algorithm, the Electro-Magnetic Transient Program (EMTP) and MATLAB are used.
金鉉烘(Hyun-Houng Kim),金眞鎬(Jin-Ho Kim),金亨中(Hyeong-Jung Kim),朴宗培(Jong-Bae Park),愼重麟(Joong-Rin Shin) 대한전기학회 2008 전기학회논문지 Vol.57 No.1
This paper presents a new approach of a evaluation of location marginal prices(LMPs) considering demand response resources in the competitive electricity market. The stabilization of the electric power supply and demand balance has been one of the major important activities in electric power industry. Recently, much attention is paid to the demand-side resources which are responsive to incentives or time-varying prices and existing power system planning and operation activities are incorporated with the so-called demand response resources. In this paper, we first present an analytical method for calculation of LMPs considering demand response resources and then break down the LMPs into three components. In this study, we assume that Korean power system consists of two major regions, one which is the metropolitan and the other is non-metropolitan region. In the case study, we have considered several LMPs cases with different use of locational demand response resource and we can obtain a locational signal to demand response resources. Also, the economics of demand response resources are evaluated, compared with the increase of transmission line capacity and of generation capacity.
金鉉烘(Hyun-Houng Kim),曺基善(Ki-Seon Cho),鄭允源(Yun-Won Jeong),朴宗培(Jong-Bae Park),愼重麟(Joong-Rin Shin) 대한전기학회 2007 전기학회논문지 Vol.56 No.8
This paper presents a graphical windows-based software for the education and training of transmission network charge. The motivation for the development of the simulator is to provide students with a simple and useable tool for gaining an intuitive feel for transmission network charge. The developed simulator consists of the main module (MMI,GUI), the power flow module (PF), the power flow tracing module (PFT), and usage cost DB module (UCD). Each module has a separate graphical and interactive interfacing window. The developed simulator provides with two power system analysis methods (i.e., DC-PF and Modified DC-PF) and supports the PSS/E input data format to load input data of power system. Also, power flow tracing can be calculate using four methods such as "Felix Wu", "Modified Felix Wu", "DCLF ICRP", and "Reverse MW mile". Results of calculation for transmission usage cost are displayed and compared on the window through the table and/or chart. Therefore, the developed simulator can be utilize as a useful tool for effective education and training of transmission network charge.
경쟁시장내의 수요자원입찰을 고려한 모선별 한계가격의 구성요소산정 기법
金鉉烘(Hyun-Houng Kim),金眞鎬(Jin-Ho Kim),朴宗培(Jong-Bae Park),愼重麟(Joong-Rin Shin) 대한전기학회 2008 전기학회논문지 Vol.57 No.7
This paper presents a new approach for the evaluation of location marginal prices (LMPs) considering demand-side bidding (DSB) in a competitive electricity market. The stabilization of the electric power supply and demand balance is one of the major important activities in electric power industry. In this paper, we present an analytical method for calculation of LMPs considering DSB, which has opportunity to compete with generating units, as England & Wales Pool's DSB scheme[1]. Also, we propose a new approach that LMP considering DSB is divided into three components. The proposed approach can be used for the evaluation of demand-side bidding into the electricity market and the assessment of the influence of DSB on total production costs and LMPs as well as three components.
Kim, Hyun-Houng,Lee, Chan-Joo,Park, Jong-Bae,Shin, Joong-Rin,Jeong, Sang-Yun The Korean Institute of Electrical Engineers 2008 Journal of Electrical Engineering & Technology Vol.3 No.4
This paper presents a new numerical algorithm for the fault location estimation and arcing fault detection when a single-phase arcing ground fault occurs on a transmission line. The proposed algorithm derived in the spectrum domain is based on the synchronized voltage and current samples measured from the PMUs(Phasor Measurement Units) installed at both ends of the transmission lines. In this paper, the algorithm uses DFT(Discrete Fourier Transform) for estimation. The algorithm uses a short data window for real-time transmission line protection. Also, from the calculated arc voltage amplitude, a decision can be made whether the fault is permanent or transient. The proposed algorithm is tested through computer simulation to show its effectiveness.
순차적 클러스터링기법을 이용한 송전 계통의 지역별 그룹핑
김현홍(Hyun-Houng Kim),이우남(Woo-Nam Lee),박종배(Jong-Bae Park),신중린(Joong-Rin Shin),김진호(Jin-Ho Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.5
This paper introduces a sequential clustering technique as a tool for an effective grouping of transmission systems. The interconnected network system retains information about the location of each line. With this information, this paper aims to carry out initial clustering through the transmission usage rate, compare the similarity measures of regional information with the similarity measures of location price, and introduce the techniques of the clustering method. This transmission usage rate uses power flow based on congestion costs and similarity measurements using the FCM (Fuzzy C-Mean) algorithm. This paper also aims to prove the propriety of the proposed clustering method by comparing it with existing clustering methods that use the similarity measurement system. The proposed algorithm is demonstrated through the IEEE 39-bus RTS and Korea power system.