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Expert system for voltage control in restoration of EHV power system following complete blackout
Author(s) -
Kakimoto Naoto,
Lin Bunpin,
Sugihara Hiroaki
Publication year - 1995
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.4391150104
Subject(s) - blackout , voltage , transformer , electric power system , engineering , high voltage , generator (circuit theory) , electric power transmission , ac power , electrical engineering , power transmission , transmission system , power (physics) , transmission (telecommunications) , reliability engineering , computer science , physics , quantum mechanics
This paper considers voltage control in restoration of EHV power systems. Restoration of a power system is performed by energizing transmission lines sequentially from initial power sources. These operations have already been programmed into an expert system developed by the authors. However, energizing no‐load transmission lines causes some bus voltages to rise 20 percent more than rated voltages, and transformers can tolerate a 20 percent voltage rise only for 1 min. Here, the expert system is supplemented with a function for checking bus voltages and reactive powers of initial sources, and which automatically switches on reactors. Conditions for switching reactors and selecting appropriate reactors are written by rules, hence they are easy to modify. The target of voltage control is to keep bus voltages with in ±5 percent, and to keep reactive powers of generators within 30 percent of generator capacity. Applying this method to three basic restoration patterns of a model power system shows that small adjustment of switching conditions is sufficient for two patterns, and some modification of the restoration procedure is necessary for the other pattern to obtain good voltage profiles through the restoration process.