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Unbalanced power flow calculation of a power system containing a variable‐speed generator
Author(s) -
Tamura Junji,
Kubo Masahiro,
Nagano Toshiyuki
Publication year - 2001
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 - 10.1002/1520-6416(200102)134:3<34::aid-eej5>3.0.co;2-w
Subject(s) - transformer , power flow , generator (circuit theory) , electric power transmission , power (physics) , control theory (sociology) , three phase , electric power system , power flow study , engineering , inverter , electrical engineering , electronic engineering , ac power , computer science , voltage , physics , control (management) , quantum mechanics , artificial intelligence
There are some factors that render a power system network unbalanced: UHV transmission lines in which three‐phase transmission lines are not transposed, an unbalanced transformer, unbalanced load as well as sustained unbalanced faults. On the other hand, the number of variable‐speed generators used in pumping‐up power stations has recently been increasing in Japan. This paper presents a new means of calculating unbalanced power flow of a power system which contains variable‐speed pumping‐up generators. This new technique is based on the phase coordinate method, because a power system which has elements of unsymmetrical impedance can easily be analyzed by using it. In this paper, phase coordinate models of the variable‐speed generator and its secondary exciting circuit, composed of a GTO converter/inverter, are analyzed first. Procedures of power flow calculation of unbalanced power systems follow. © 2000 Scripta Technica, Electr Eng Jpn, 134(3): 34–43, 2001