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LMI Based Wide Area TCSC Controller in Mitigating Small Signal Oscillations
D. Mondal1, A. Chakrabarti2, A. Sengupta3 

1D. Mondal is with the Department of Electronics and Instrumentation Engineering, Haldia Institute of Technology, Purba Medinipur, Haldia, India.
2A. Chakrabarti is with the Department of Electrical Engineering, Bengal Engineering and Science University, Howrah, India.
3A. Sengupta is with the Department of Electrical Engineering, Bengal Engineering and Science University, Howrah, India.
Manuscript received on December 03, 2011. | Revised Manuscript received on December 18, 2011. | Manuscript published on January 05, 2012. | PP: 139-144 | Volume-1 Issue-6, January 2012. | Retrieval Number: F0285111611/2012©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: This paper proposes a Linear Matrix Inequality (LMI) based Η robust controller design employing Wide Area Measurement (WAM) based stabilizing signals as generator speed. A Three-input, Single-output (TISO) controller is designed for a Thyristor Controlled Series compensator (TCSC) in order to mitigate small signal oscillations in a multimachine power system. The controller design has been carried out based on the Η mixed-sensitivity formulation in a LMI framework with pole-placement constraint. The small signal performance of the test system has been examined employing eigenvalue analysis as well as time domain response. The designed controller is found to be robust against disturbances like varying generations as well as load power demand.
Keywords: H∞ Robust Controller, Linear Matrix Inequality, Small Signal Oscillations, Thyristor Controlled Series Compensator, Wide Area Measurement.