Multivariable robust power system stabiliser design based on H∞

This paper deals with the design and evaluation of a H∞ based PSS using the state space approach. H∞ design method leads to a fixed-structure and fixed-parameter robust controller. An essential prerequisite in the synthesis of H∞ is to obtain a nominal linear system model. Uncertainties in the model are taken into account in the specification of the cost-function weights. The effectiveness of the proposed PSS is demonstrated under different operating regimes. A comparative study of the proposed PSS with a conventional PSS such as PI and optimal state feedback controllers has been performed and the superiority of the H∞ based PSS in improving the transient stability of the power generator is demonstrated in simulation environment