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LQR based Power System Stabilizer for Damping Oscillations with Frequency Response Analysis

Niharika Agrawal, Faheem Ahmed Khan, Mamatha Gowda

Abstract


The demand of electricity is continuously increasing. Due to lack of conventional sources of energy to meet the rising demand different renewable sources of energy like wind, solar, biomass which are geographically dispersed and are located at remote places are used with them. Due to which the power system is becoming complex. For the secure, reliable and flexible operation the interconnection of distributed generation (DG) and various power networks is done. As the input to the DG is inconsistent in nature, any load variation can result in local mode of oscillation. There are problems of low frequency oscillations when the power systems are interconnected by weak tie lines. The local modes of oscillations are produced when a generator swing against the rest of the system and in interarea mode of oscillations there are groups of generators swinging against each other. In the present work Power system stabilizers (PSS) are used to damp the local mode of oscillations and for enhancing the stability of the system. The stability is further improved using linear quadratic approach of optimal control theory to the PSS. The feedback gain matrix k from LQR stabilizes the variation in state variables.


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References


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