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A decentralized control system for stabilizing multimachine power systems
Author(s) -
Ohtsuka Kei,
Nishida Makoto,
Morioka Yasuo,
Yachida Kenji
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.4391160506
Subject(s) - control theory (sociology) , electric power system , decentralised system , control engineering , stability (learning theory) , control system , power (physics) , control (management) , engineering , state (computer science) , state variable , variable (mathematics) , control variable , computer science , mathematics , mathematical analysis , physics , electrical engineering , algorithm , quantum mechanics , artificial intelligence , machine learning , thermodynamics
A decentralized control system is studied for stabilizing multimachine power systems. A longitudinal power system with three areas, each having one machine, is considered in this study. A decentralized control design method is proposed, which is based on the optimal regulator theory. First a centralized control system is designed without any consideration on whether state variables are all available or not. Second a pseudo‐decentralized control system is designed by omitting control gains corresponding to state variables which give hardly any effects on the power system stability. It is found that only one variable of phase angle of each machine is absolutely necessary for the pseudo‐decentralized control system. This leads to an idea based on power system engineering, that is to say, new variables of tieline power flow are introduced in the decentralized control system design to substitute for the phase angle of each machine. Thus a decentralized control system for power system stability can be designed using the new variables of tieline power flow. It is demonstrated from simulation studies that the decentralized control system improves even longitudinal power system stability as well as the centralized control system.