An improved Fast Decoupled Load Flow calculation method for distribution systems with high R/X ratio is proposed. This method is based on a coordinate transformation in Y-matrix for Jacobian matrix in the load flow method. The biggest advantage of so-called Fast Decoupled Load Flow(FDLF) method over the conventional Newton-Raphson method is the short computation time for large power systems which is achieved by the reduced size of Jacobian matrix. However, it is said to worsen convergence characteristics for distribution systems with lines of high R/X ratios compared to the conventional Newton-Raphson method. In order to overcome the problem, the authors employed a coordinate transformation in Y-matrix of the Fast Decoupled method. Better convergence processes in the improved Fast Decoupled method are demonstrated and some discussions are given in case of the analysis of the distribution systems with high R/X ratio lines. Index Terms--Power flow calculation, Newton-Raphson method, Fast decoupled load flow, Distribution systems VI. BIOGRAPHIES Daiki Yamashita (StM'07) is a Ph.D student at Waseda University, Tokyo Japan. He has received his B.S degree from the Department of Electrical Engineering and Bioscience, Waseda University in 2008, and an M.S. degree from the Graduate School of Environment and Energy Engineering, Waseda University, in 2010. His current interests are optimal scheduling problem concerning CO2 emission trading or emission limitations and model of Electric Vehicle Markets and Charging Infrastructure. He is a student member of IEE of Japan and IEEE. Kaoru Koyanagi (M'96) received his B.S degree in applied physics from Tokyo University of Education in 1971. He obtained Ph.D. degree in electrical engineering from Tokyo Metropolitan University in 2000. From 1971From to 1996, he was with Toshiba Corp. working on power system analytical engineering. He has been involved in various aspects of power system stability analysis and design of control systems. He is currently with Environment and Energy Research Center, Waseda University, Japan. He is chartered engineer in UK, and is a member of IEE of Japan, IET and IEEE.Ryuichi Yokoyama received the degrees of B.S., M.S., and Ph.D. in electrical engineering from Waseda University, Tokyo, Japan, in 1968, 1970, and 1974 respectively. After working in Mitsubishi Research Institute, from 1978 through 2007, he was a professor in the Faculty of Technology of Tokyo Metropolitan University. Since 2007, he has been a professor of the Graduate School of Environment and Energy Engineering in Waseda University. His fields of interests include planning, operation, control and optimization of large-scale environment and energy systems, and economic analysis and risk management of smart grid and community. He is a fellow of IEEE and a senior member of IEE of Japan, and a member of CIGRE. Chairmen of Standardization Commissions of Electric Apparatus and Wind Generation Grid Connection Commission in METI Japan. The president of Consortium of Power System Technology of...
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