A study on Governor-PSS Co-Operative Control via robust control theory

Abstract

Power system stabilizers (PSS) are designed to reduce oscillations in power systems. Since PSS cannot ab-sorb energy by itself, surplus energy is consumed by damper windings and loads. On the other hand, if turbine governor which can absorbsurplus energy directly is operated pertinently, it will be considered to be effective in recovery of energy balance. We have proposed the Governor-PSS Co-Operative control method, which utilizes mechanical torque supplied by turbines in addition to electrical torque handled by PSS.
However, since operation of governorhas influence on turbine wings, it cannot be operated by the same frequency bandas PSS. In order to take in such complicated specification, the H₂ control theory in which delicate adjustment is possi-ble was adopted.
This paper shows a H₂ controller design procedure consulting conventional PSS properties and the performance of this me-thod through simulation results with widely varied power systems.