Power system stability is the study of a synchronous power system's dynamic response to disturbances, defined formally as the ability of a system, given an initial operating equilibrium, to regain a state of operating equilibrium after a disturbance with most system variables bounded. Because the underlying power system is a large, nonlinear, multivariable dynamic system, stability is classified by the physical nature of the instability—rotor angle, voltage, or frequency—driven respectively by real power imbalance between mechanical and electrical torque/power, reactive power imbalance, and imbalance between generation and load, with the rotor angle dynamics formally captured by the synchronous machine swing equation derived from Newton's second law for rotational motion.
Power system stability is the study of a synchronous power system's dynamic response to disturbances, defined formally as the ability of a system, given an initial operating equilibrium, to regain a …