PSS3B system stabilizer parameter optimisation in multi-machine power system

The paper presents the results of parameter optimisation of PSS3B dual input power system stabilizers designed for damping rotor swings of synchronous generators in the power system of a non-linear mathematical model. It is assumed that the power system consists of generator nodes and receiving nodes, all interconnected by the power system network. A generator with its excitation system and the PSS operates within the generator nodes. The generator is powered by a driving turbine with governor system. The parameters of the system stabilizers were determined by minimising the generalised quality factor in the multi-machine power system. The quality factor was calculated from deviations of the active power, rotational speed and generator voltage in individual generator nodes for transient symmetrical short-circuits in transmission lines of the system. The exemplary optimisation computations were carried out for a Cigre 7-machine power system. The presented computations were performed for systems with and without stabilizers