Tuning of power system stabilizer PSS3B and analysis of its properties

The purpose of the power system stabilizers (PSS) is to provide additional damping to the interarea, local and intrastation modes of electromechanical oscillations and thus to improve the small-signal stability of the electric power systems. There are a number of PSS types, standardized by IEEE. The most widely used and commented in the literature stabilizer types are the dual-input, single band PSS2B and the dual-input, multi-band PSS4B. Very scarcely covered in the literature is the dual-input, single-band stabilizer - PSS3B. This paper aims to fill-in the gaps in terms of PSS3B ability to provide good phase compensation for a wide frequency range. Also, to study the frequency-domain response of the PSS in order to verify its filtering properties by testing different configurations of its structure. The results show that PSS3B can provide very good compensation, comparable to PSS2B. However, its filtering properties should be carefully examined because it has certain drawbacks with respect to that.