Power system stabilizer by using supplementary remote signals

Abstract- This paper presents the design of local H ∞ power system stabilizer (PSS) controller which uses wide-area or global signals as additional meas-uring information from suitable remote network locations where the oscillations are well observable. The controller, placed at suitably selected genera-tors, provide control signals to the automatic voltage regulators to damp out inter-area oscillations through the machines ’ excitation systems. Electrical outputs of generators have been used as input sig-nals. To provide robust behavior, H ∞ control theory using an algebraic Riccati equation (ARE) approach has been used to design the proposed controller. The effectiveness of the H ∞ controller is demonstrated through digital simulation studies on a test power system. The simulation results show that the de-signed controller contributes significantly to the damping of inter-area oscillations and the enhance-ment of small-signal stability under a wide range of system operating conditions