A novel method based on Prony analysis for fundamental frequency estimation in power systems

A Novel method for fundamental frequency estimation in power systems is presented, which has three stages. In the first stage, the input signal is decomposed into two orthogonal components by using cosine and sine filters with a variable window. In the second stage, the cosine-filtered and sine-filtered signals are squared to improve the performance of estimating the fundamental frequency. Finally, Prony analysis estimates the fundamental frequency by approximating the squared signals. The performance of the proposed method was estimated for dynamic conditions on an IEEE 5-bus system. PSCAD/EMTDC was used to generate voltage signals for a load increase case and single phase-to-ground faults. The performance evaluation showed that the proposed method accurately estimated the fundamental frequency of power system signals.