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A Study on LQG/LTR Control for Damping Inter-Area Oscillations in Power Systems

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4 Author(s)
Zolotas, A.C. ; Dept. of Electr. & Electron. Eng., Imperial Coll., London ; Chaudhuri, B. ; Jaimoukha, I.M. ; Korba, P.

This brief presents results on a robust linear quadratic Gaussian (LQG) damping control scheme for improving the inter-area mode oscillations of power systems. A technique is also proposed to guarantee minimum-phase/well-damped transmission zeros by appropriately "squaring" the design plant, for the purposes of efficient robust recovery. A 7th-order multiple-input single-output (MISO) centralized controller is designed for a 16-machine, 5-area power system (138th order) reinforced with a thyristor-controlled series capacitor (TCSC) to improve the damping of the critical inter-area modes by employing appropriate global signal measurements. Loop transfer recovery (LTR) is then applied to reinforce controller robustness in the case of faults and unknown disturbances. The performance of the designed system is assessed in the frequency domain and via appropriate time-domain simulations based upon the nonlinear model under a variety of scenaria

Published in:

Control Systems Technology, IEEE Transactions on  (Volume:15 ,  Issue: 1 )

Date of Publication:

Jan. 2007

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