Real time implementation of H∞ loop shaping robust PSS for three-machine power system using dSPACE

This paper presents the experimental evaluation of the designed power system stabilizer for a 3-machine, 9-bus power system. Based on the non-linear robust control theory, a control design is applied to design a Robust Power System Stabilizer (RPSS) to stabilize a linearized uncertain power system using Glover-McFarlane H_∞ loop shaping design procedure. The efficiency of the designed controller is tested by implementing on real time environment using dSPACE work stations DS1005 and DS1104. The real time experimental results of RPSS are compared with that of the conventional power system stabilizer (CPSS) for a three phase fault. Also, the real time simulation results of RPSS are compared with the off-line simulation results of RPSS, thus validating the simulation results with the experimental results. Justification of robustness is also presented by considering three different operating points.