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10). The power system stabilizer is a very effective method of enhancing small-signal stability performance. The PSS uses auxiliary stabilizing signals to control the excitation system so as to improve the power system dynamic performance. Commonly used input signals are and The power system performance is improved by the damping of system oscillations.

15). Small signal stability is analyzed used State Space models. Equilibrium points can be observed when the derivatives of the state variables are equal to? 16). Equilibrium points can be locally, finite, or globally? 17). What can be done to State Space models to analyze nonlinear systems? 18). The values of s which satisfy the above equations are known as the of the state matrix A. The characteristic equation is det(sl-A) = 0 19). The determine if the system is stable, unstable, or oscillatory. 20). A corresponds to a non-oscillatory mode. A represents a decaying mode. A represents aperiodic instability.