| Disturbances, including loss of lines and generators and significant changes in system load, are a normal part of power system operation. When a disturbance occurs, the power system moves from one steady state, through a transient period, hopefully to a new steady state. As the power system moves toward what is hopefully a new steady state, it normally enters a condition where there is linear operation. However inertias, transport lags, transmission system configuration (loss of major transmission lines), system time constants, controller time constants, and controller gain settings become important in this region. If controllers are not properly set/tuned, dynamic instability may occur.The preferred method for analysis of power system dynamics is an eigenvalue analysis. Since the power system occupies such a large geographical area, and since there may be hundreds of eigenvalues involved, the dynamic instability may occur. The preferred method for analysis of power system dynamics is an eigenvalue analysis. Since the power system occupies such a large geographical area, and since there may be hundreds of eigenvalues involved, dynamic analysis becomes very complex. Topics include: introduction to the power system stability problem, synchronous machine modeling and theory, synchronous machine parameters, synchronous machine representation in stability studies, ac transmission, power system loads, excitation systems, prime movers and energy supply systems, high voltage direct current transmission, control of active and reactive power, small signal stability, transient stability, voltage stability, subsynchronous oscillations, mid term and long term stability, and methods of improving stability |
