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H-Infinity Analysis Method For The Small Signal Stability Of Power System

Mei Shengwei,Che Wenyan

PROCEEDINGS OF THE 26TH CHINESE CONTROL CONFERENCE, VOL 3（2007）

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Abstract
This work is concerned with the small signal stability problem in multi-machine systems. By means of H theory, firstly the math model with disturbances is constructed; and secondly, the excitation control law for each generator is designed based on solving Riccati Equation. Finally, simulations performed on 4-machine system shows that the proposed H method has more advantages over LQR method in both damping ratio and H-infinity norm of the corresponding closed-loop system and so can enhance the small signal stability of power system greatly.
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Key words
small signal stability,H-infinity method,excitation control,multi-machine systems
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