Estimation of Power System Frequency Using Adaptive Notch Filter

An algorithm based on the concept of adaptive notch filter (ANF) is proposed for estimation of power system frequency. The ANF is a second-order notch filter that is further furnished with a nonlinear differential equation to update the frequency. Performance of the algorithm is compared with that of a newly introduced algorithm which is based on using an enhanced phase-locked loop (PLL) system. Unlike the PLL-based frequency estimator, the proposed algorithm does not employ voltage-controlled oscillator (VCO). This makes its structure much simpler for implementations. Transient response of the proposed estimator is faster than the PLL-based estimator. Computer simulations are presented to highlight the usefulness of this approach in estimating near nominal and off nominal power system frequency