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Approach and structure of stabilizing control system preventing an extension of synchronism loss |
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| Authors: | Yoshifumi Ōura Mamoru Suzuki Ken Yanagihashi Masihiro Sato Ryouichi Tsukui Tetsuro Matsushima Kazuya Omata |
| Affiliation: | 1. Tokyo Electric Power Co.
Yoshifumi Oura graduated from Fukushima Technical High School in 1954 and joined the Tokyo Electric Power Co. He passed the Denken First Class in 1962. He is in charge of a section on the development, management and control technology of system protection and control system in the System Operation Division, and recently was promoted to general Manager of that Division (in charge of control system technology). He received a Paper Award in 1987 and a Progress Award in 1989 from the I.E.E., Japan.;2. Tokyo Electric Power Co. Mamoru Suzuki obtained a Master's degree from the Engineering Division, Keio University in 1974 and joined the Tokyo Electric Power Co. He has been engaged in the development of the power supply automatization system and the protection and control systems of power systems in the Control Technology Department of the company's System Operation Division. He is currently Head of that Department. He received a Paper Award from the I.E.E., Japan in 1991.;3. Tokyo Electric Power Co. Ken Yanagihashi obtained a Master's degree from the Engineering Research Division, Shizuoka University in March 1980 and joined the Tokyo Electric Power Co. After having worked in the maintenance of hydropower generation facilities and system operation business, he is engaged at present in the development of system protection and control system in the Control Technology Department of the System Operation Division. He is now a Deputy Head of the Department. He received a Paper Award from the I.E.E., Japan in 1991.;4. Toshiba Corporation Masahiro Sato graduated in 1968 from the Department of Electrical Engineering, Tohoku University in March 1968 and joined the Toshiba Corporation. He is engaged in research on security monitoring and stabilization method of power systems. He received a Master's degree from Purdue University (U.S.) in 1978. He also has a Dr. of Eng. degree. He received a Progress Award from the I.E.E., Japan in 1975.;5. Toshiba Corporation Ryouichi Tsukui graduated in 1971 from the Department of Electrical Engineering, Faculty of Science and Engineering, Waseda University and joined the Toshiba Corporation. He is engaged mainly in the development of protection and control systems of power systems. He is presently a Head of the System Protection and Control Group of the Power System Technology Division.;6. Toshiba Corporation Tetsuro Matsushima graduated from the Department of Electrical Engineering, Faculty of Engineering, University of Tokyo in June 1971 and joined the Tokyo Shibaura Electric Co. [now Toshiba Corporation] in July of the same year. Since then he has been engaged in the design of protective relaying equipment, development of digital relays, and development of system stabilization equipment at Fuchu Works.;7. Toshiba Corporation Kazuya Omata obtained a Master's degree from the Science and Engineering Research Division of Waseda University in 1980 and joined the Toshiba Corporation. Since then he has been engaged in research on monitoring and control methods of power systems at Heavy Electrical Technology Research Laboratory. |
| Abstract: | Recently, large-capacity power stations have been built far from load centers with long-distance transmission lines. Therefore, if a fault occurs at the line, generators in the large-capacity power station may lose synchronism from the remaining generators 1, 3]. To prevent an extension of loss of synchronism to other generators, fast shedding of some generators is an effective measure. The following methods have been proposed so far: A method 3] based on energy function approach; and a method 2] which estimates and predicts the relative swing among generators using data measured on-line at each generator and proposes shedding some generators for stabilization. This method requires a large communication network for an exchange of data between power stations. This paper presents a new stabilizing method and a newly developed stabilizing control system which does not require a large communication network because it utilizes generator output, voltage and current measured on-line in the vicinity of the large-capacity power station. Using these measured data, the system estimates and predicts the relative swing between generators in the large-capacity power station and the remaining generators. Finally, the number of generators to be shed for stabilization is decided and shedding is performed. Configuration and characteristics of the developed stabilizing control system are shown. The validity of this method is confirmed by simulation and testing using an artificial power system. |
| Keywords: | Power system transient stability stabilizing control system real time measurement estimation prediction voltage phase angle generator shedding |