ABSTRACT
Small-signal stability, is related to operating conditions, such as power transfer level. Small-signal stability influences power transfer capability of a system. This chapter presents three example problems on small-signal stability. In the first example, the chapter uses small-signal stability to investigate the power transfer capability for a single-machine infinite-bus (SMIB) system with and without power system stabilizer (PSS). In the second example, the chapter investigates inter-area oscillations using networked control system theory, specifically homogeneous system static output feedback stability criterion. In the third example, the chapter also investigates torsional interaction phenomenon between a generator's turbine and a series compensated network. Using frequency-domain models and linear system analysis tools such as the root locus method, the chapter shows that torsional interactions occur when the series compensation degree increases. These stability (instability) issues are related to operating conditions, such as power transfer level and compensation degree.
