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Recognition of coherent swing in power systems and detection of step‐out using power and current measured on tie lines
Author(s) -
Minagawa Tamotsu,
Ichikawa Yoshinori,
Sato Masahiro,
Ishihara Yuji
Publication year - 1997
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(199706)119:4<22::aid-eej3>3.0.co;2-l
Subject(s) - synchronism , swing , control theory (sociology) , generator (circuit theory) , power (physics) , line (geometry) , fault (geology) , phase angle (astronomy) , voltage , electric power system , electrical engineering , computer science , engineering , mathematics , physics , acoustics , optics , control (management) , geometry , quantum mechanics , artificial intelligence , seismology , geology
When a fault occurs in a large interconnected power system, several generators may swing coherently and form a group. Loss of synchronism may occur among groups of these generators. In order to develop a stabilizing control system, two new methods are proposed in this paper. The first method is to select generators which swing coherently. The method uses a new index that is based on the physical relation: when two generators swing coherently, the phase angle of a generator terminal voltage increases when the angle of the other generator increases, and decreases when the other decreases. To detect a loss of synchronism, the power P and current I measured on a line with the interval of a certain time period are used. By using this method, the position of the operating point of power system after disturbance on the power angle curve can be estimated. This means that the degree of stability can be observed with a small number of observations measured on a line. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 119(4): 22–31, 1997