ABSTRACT
Information about the steady-state limiting conditions can be obtained from a power flow analysis. Power flow analyses require information about system configuration, information about the net active and reactive power injections at each bus, and information about regulating transformers. Information about stability limits is obtained from stability analyses. Most of the modern undergraduate power system analysis textbooks devote a chapter to stability analyses. Relative stability can be determined from calculating how the machine’s rotor angle changes during a very short period of time following a fault or disturbance. For systems with more than two machines, hand calculation becomes impractical, but many computer programs are available for performing stability analyses. Usually, a power system analysis software package will include a power flow program, a fault analysis, and a stability analysis program. System operators anticipate the steady-state effects of increased power system loading or the occurrence of a contingency using power flow analysis tools.
