Formulation of a MIMO linear power system stabiliser for identical generating units at a common busbar

The fundamental formulation, analysis and sample simulation studies reported show how the linear power system stabiliser (PSS) can be evolved so as to accommodate more than one identical power generating unit operating at a common busbar. The presentation augments the more conventional approach by which the PSS is formulated for a single-machine-infinite-busbar system. In preference to single-generator installations, practical generating stations frequently configure multiple identical units to operate in parallel. Although this reduces dependence on a single unit, a multi-unit configuration is susceptible to oscillations between two or more units. Such oscillations are classified as intraplant dynamics. The proposed PSS formulation includes rigorous consideration of intraplant dynamics at the design stage. Simulation studies clearly substantiate the superiority of the proposed multi-input-multi-output PSS over the more conventional single-input-single-output version.