ABSTRACT
This chapter explains the main concepts and tools associated with power system stability and security analysis, within the framework of competitive electricity markets. It discusses frequency stability analysis concentrates on studying variations in system frequency due to large sudden changes in the generation-load balance. Observe that the power system stability is classified in terms of the main system variables: generator rotor angles, bus voltage magnitudes, and system frequency. Frequency stability refers to the ability of a power system to maintain an acceptable frequency after a system disturbance resulting in significant imbalance between generation and load demand. A severe system disturbance can result in large excursions of frequency, power flows, voltages, and other system variables that can trigger actions not only from controls and protections, but also from other processes that are not normally modeled in standard transient stability and voltage stability studies.
