On the estimation of transient state of power system by discrete nonlinear observer

Abstract
This paper presents a new nonlinear observer (extended linear observer) which estimates the transient state of power system. The transient state of the power system is represented as a continuous time nonlinear differential equation and observation of output is obtained as a discretized value at every cycle of system frequency by using the mean value detecting circuit device. The nonlinear differential equation of state is discretized at each observation instant by Taylor expansion, and then the theory of discrete linear observers is applied to the discretized system. Digital computer simulation confirms that the observer estimates the state successfully not only in the case of hunting but also in step-out transient state of a synchronous machine.

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