Application of Recursive Least Square (RLS) algorithm with variable forgetting factor for frequency components estimation in a generic input signal

Signal estimation is important for protection, system study and control purposes. This paper deals with the application of a Recursive Least Square (RLS) algorithm with variable forgetting factor for estimation of frequency components in a generic input signal. Application areas such as synchronization and control in three-phase and single-phase systems for various grid conditions as well as estimation of harmonic and subsynchronous components will be discussed. Simulation and experimental results will be used to evaluate the dynamic performance of the algorithm.