Partial pole placement of H-infinity based PSS design using numerator-denominator perturbation representation

A new H-infinity PSS design method which uses the numerator-denominator per turbation representation and includes the partial pole placement technique and a new weighting function selection method is proposed. This overcomes c ertain conventional H-infinity PSS design algorithm limitations. A sixth-or der machine model is used to increase the accuracy of selected weighting fu nctions. A robust PSS has been successfully designed for single and two-mac hine systems by treating the highly nonlinear characteristic of the power s ystem as model 'uncertainty'. The design is verified to have better perform ance for a wide range of system operating conditions when compared with the conventional PSS designs.