Premium
Selection of the best siting of static var compensators for effective damping
Author(s) -
Okamoto Hiroshi,
Kurita Atsushi,
Kobayashi Naoki,
Sekine Yasuji
Publication year - 1996
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/eej.4391170107
Subject(s) - control theory (sociology) , static var compensator , modal , electric power system , stability (learning theory) , swing , steady state (chemistry) , modal analysis , voltage , transient (computer programming) , engineering , mode (computer interface) , power (physics) , ac power , computer science , control (management) , finite element method , physics , mechanical engineering , chemistry , structural engineering , quantum mechanics , artificial intelligence , machine learning , polymer chemistry , electrical engineering , operating system
A static Var compensator (SVC) can improve the steady‐state stability (or the small signal stability), if it is located appropriately. The present paper proposes a method for selecting the best siting of SVC in large‐scale power systems for damping effectively. Conventionally, it is thought that SVC improves steady‐state stability by its voltage regulating ability. From this point of view, the stability can be improved significantly if SVC is located at the bus which has a large voltage fluctuation due to the lightly damped power swing mode. In contrast to the conventional viewpoint, the present paper makes it clear that the steady‐state stability deteriorates by the conventional voltage regulating control of SVC in some cases. Therefore, the voltage fluctuation is not an appropriate index for effective damping. This paper explains the mechanism of improvement of steady‐state stability by SVC in terms of modal analysis. On the basis of modal analysis, an index for determining the location of SVC is derived. The index is called LIED (Location Index for Effective Damping) by the authors. Digital simulations are conducted for an 8‐machine longitudinal system and a 29‐machine looped system to demonstrate the validity of the proposed index.