Application of Indirect Adaptive Control Philosophy for Inertia Estimation

This paper proposes an application of Indirect Adaptive Control (IAC) philosophy for Power System (PS) inertia estimation. It only requires the frequency measurement from the Phasor Measurement Unit (PMU) located at the bus at which inertia is to be estimated. No other system data or approximations are required, which is generally a necessity in other inertia estimation techniques in the literature. In order to implement the IAC philosophy for inertia estimation, swing equation of the synchronous generator is to be rearranged in a standard affine system form. Radial Basis Function Network (RBFN) is used in IAC for swing equation emulation while feedback linearization technique is used to generate a control signal required to track the desired frequency response. The parameters of the IAC structure are updated online and no prior knowledge is required in this regard. Real Time Digital Simulator (RTDS) based results on the two area Prabha Kundur system prove the accuracy of the proposed inertia estimation approach.