Abstract:
Protecting transmission lines frequently involves applying distance relays. Protective relays must filter their inputs to reject unwanted quantities and retain signal qua...Show MoreMetadata
Abstract:
Protecting transmission lines frequently involves applying distance relays. Protective relays must filter their inputs to reject unwanted quantities and retain signal quantities of relevant interest. Accuracy and convergent speed of filter algorithm are essential for protective relays. A widely applied filter algorithm, the discrete Fourier transform (DFT) can easily remove integer harmonics using simple calculation. However, the voltage and current signals contain serious harmonics and decaying DC during the fault interval. In addition, the decaying DC and higher order harmonics seriously decrease the precision and convergence speed of fundamental frequency signal from DFT. In this investigation, the authors derive a novel algorithm which combines the appropriate analog low pass filter and modified full cycle DFT (FCDFT) or half cycle DFT (HCDFT) algorithm to remove the decaying dc in a voltage or current signal. Using the Electromagnetic Transients Program (EMTP) simulates the transient responses of transmission lines during the fault period. Applying the proposed algorithm in distance relays effectively suppresses the decaying DC and quickly decomposes the accurate fundamental frequency components.
Published in: IEEE Transactions on Power Delivery ( Volume: 16, Issue: 3, July 2001)
DOI: 10.1109/61.924813
National Taiwan University of Science and Technology, Taipei, Taiwan
Sun-Li Yu was born in 1965. He graduated in electrical engineering from the National Taipei Institute of Technology in 1985. He passed the national examination of electrical engineering in 1988. He received the M.S.E.E. degree from the National Tsing Hua University, Hsinchu, Taiwan, in 1990. He joined the Kuang-Wu Institute of Technology as an instructor since 1992. He joined the Ph.D. program in electrical engineering in...Show More
Sun-Li Yu was born in 1965. He graduated in electrical engineering from the National Taipei Institute of Technology in 1985. He passed the national examination of electrical engineering in 1988. He received the M.S.E.E. degree from the National Tsing Hua University, Hsinchu, Taiwan, in 1990. He joined the Kuang-Wu Institute of Technology as an instructor since 1992. He joined the Ph.D. program in electrical engineering in...View more
National Taiwan University of Science and Technology, Taipei, Taiwan
Jyh-Cherng Gu was born in 1958. He received his B.S. degree from the National Taiwan University of Science and Technology (NTUST), Taipei, Taiwan, in 1984. He worked with the Taiwan Electrical and Mechanical Engineering Services, Inc. as an Electrical Engineer from 1984–1986. He received the M.S. and Ph.D. degrees in electrical engineering from the University of Texas at Arlington in 1987 and 1992, respectively. Since the...Show More
Jyh-Cherng Gu was born in 1958. He received his B.S. degree from the National Taiwan University of Science and Technology (NTUST), Taipei, Taiwan, in 1984. He worked with the Taiwan Electrical and Mechanical Engineering Services, Inc. as an Electrical Engineer from 1984–1986. He received the M.S. and Ph.D. degrees in electrical engineering from the University of Texas at Arlington in 1987 and 1992, respectively. Since the...View more
Contents National Taiwan University of Science and Technology, Taipei, Taiwan
Sun-Li Yu was born in 1965. He graduated in electrical engineering from the National Taipei Institute of Technology in 1985. He passed the national examination of electrical engineering in 1988. He received the M.S.E.E. degree from the National Tsing Hua University, Hsinchu, Taiwan, in 1990. He joined the Kuang-Wu Institute of Technology as an instructor since 1992. He joined the Ph.D. program in electrical engineering in NTUST in September 1996.
Sun-Li Yu was born in 1965. He graduated in electrical engineering from the National Taipei Institute of Technology in 1985. He passed the national examination of electrical engineering in 1988. He received the M.S.E.E. degree from the National Tsing Hua University, Hsinchu, Taiwan, in 1990. He joined the Kuang-Wu Institute of Technology as an instructor since 1992. He joined the Ph.D. program in electrical engineering in NTUST in September 1996.View more
National Taiwan University of Science and Technology, Taipei, Taiwan
Jyh-Cherng Gu was born in 1958. He received his B.S. degree from the National Taiwan University of Science and Technology (NTUST), Taipei, Taiwan, in 1984. He worked with the Taiwan Electrical and Mechanical Engineering Services, Inc. as an Electrical Engineer from 1984–1986. He received the M.S. and Ph.D. degrees in electrical engineering from the University of Texas at Arlington in 1987 and 1992, respectively. Since then, he joined the Department of Electrical Engineering at NTUST as an Associate Professor. He has been involved in research on microcomputer-based relay, protection coordination, power quality, and distribution automation for power systems.
Jyh-Cherng Gu was born in 1958. He received his B.S. degree from the National Taiwan University of Science and Technology (NTUST), Taipei, Taiwan, in 1984. He worked with the Taiwan Electrical and Mechanical Engineering Services, Inc. as an Electrical Engineer from 1984–1986. He received the M.S. and Ph.D. degrees in electrical engineering from the University of Texas at Arlington in 1987 and 1992, respectively. Since then, he joined the Department of Electrical Engineering at NTUST as an Associate Professor. He has been involved in research on microcomputer-based relay, protection coordination, power quality, and distribution automation for power systems.View more
