Estimation of Power System Inertia Using System Identification

This paper analyses system identification techniques on simulated wide area measurements of active power and frequency to estimate inertia in real time and continuous manner. Single input single output (SISO) system identification is applied on IEEE 9 bus system with dynamic load changes. The paper presents a method of extraction of inertia from identified models. The proposed method uses the maximum rate of change of frequency obtained by differentiating the step response of identified transfer functions rather impulse response at zero. A comparison of the proposed method is done with two methods proposed in the literature.