Mitigation of Small-Signal Stability Problem Employing Power System Stabilizer

The prime objective of this book has been explored in this chapter. The problem of small-signal stability has been investigated by applying the traditional controller, PSS. A speed input single-stage PSS has been applied in the linearized model of a SMIB power system, and then, the application of PSS has been extended in a multimachine network. In both cases, investigation is carried out by studying the behavior of the critical eigenvalue without and with the application of PSS. The stability aspects of the critical eigenvalue with changes of PSS gain has also been evaluated by the root-locus analysis. This chapter also focuses on the issue of identification of the optimal site of a PSS in a multimachine power system. A new method to select the optimum location of a PSS has been proposed here. The validity of the newly proposed PSS location indicator is tested by comparing it with the methods available in existing literatures. A WSCC type 3-machine, 9-bus test system has been taken as a test case.