A Comparison Between Different Inertia Estimation Algorithms in Smart Grids Aapplications

This work analyzes the applicability of three different inertia estimation algorithms in smart grids under the presence of converter-interfaced generators (CIGs). Firstly, an analysis of a rate-of-change-of-frequency-based inertia estimator is conducted, showing that it is not applicable when fast frequency control of CIGs is activated. Secondly, two iterative system identification estimators are proposed, namely the output error (OE) and the equation error (EE) formulations. A comparison between OE and EE algorithms in terms of estimation accuracy, computational burden, and robustness to noise is conducted.