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Decentralized load frequency based on H ∞ control
Author(s) -
Ishii Toshiyuki,
Shirai Goro,
Fujita Goro
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/eej.1062
Subject(s) - control theory (sociology) , automatic frequency control , frequency deviation , decentralised system , electric power system , norm (philosophy) , control (management) , transfer function , computer science , frequency regulation , optimal control , control system , frequency response , control engineering , power (physics) , engineering , mathematics , mathematical optimization , telecommunications , physics , electrical engineering , quantum mechanics , artificial intelligence , political science , law
This paper presents a decentralized load frequency control (LFC) based on H ∞ optimal control theory with an observer. A few LFC schemes have been proposed based on the optimal control theory, but they have not considered the change of system parameters in operation and the characteristics of load disturbances in a target system. In this paper, H ∞ robust control is introduced to address such problems. Owing to its practical merit, the proposed control scheme is a decentralized LFC. Employing observer theory, the proposed method requires only frequency and tie‐line power deviation in each area. Numerical simulations are shown to demonstrate the effectiveness of the proposed method. H ∞ control was proven to show greater effectiveness of damping disturbance over the conventional optimal control by the design of control systems aimed at restricting the H ∞ norm of its transfer function. In particular, when a decentralized LFC is applied, by reducing the system size, H ∞ norm is easier to dampen; thus H ∞ control is more effective in the decentralized control. Future research topics include the design of H ∞ control system with a weight on frequency response. © 2001 Scripta Technica, Electr Eng Jpn, 136(3): 28–38, 2001