A novel Kalman filter for frequency estimation of distorted signals in power systems

By Aurobinda Routray, A. Pradhan, K. Rao. IEEE Transactions on Instrumentation and Measurement, 2002

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Accurate Estimation of Single-Phase Grid Voltage Fundamental Amplitude and Frequency by Using a Frequency Adaptive Linear Kalman Filter (2016, methodology): “When compared with an EKF, it is linear; avoids the derivatives of the nonlinear functions; does not contain nonlinear terms; and is computationally less complex.”
Variable-Frequency Grid-Sequence Detector Based on a Quasi-Ideal Low-Pass Filter Stage and a Phase-Locked Loop (2010, methodology): “crossing detection [32]–[39], Fourier transform [36], [40], [41], Kalman filtering [42], PLL based [43], and adaptive notch filter”
Dynamics Assessment of Advanced Single-Phase PLL Structures (2013, methodology): “Zero-crossing-detection-based methods [6], [7], Kalman filtering [8], digital Fourier transform and its modifi-”
A Complex Least Squares Enhanced Smart DFT Technique for Power System Frequency Estimation (2017, background): “These include phase-locked loops (PLLs) [4], [5]; notch filters [6]; least-squares (LS) techniques and their variants [3], [7], [8]; adaptive filtering [9]–[11]; Kalman filtering [12], [13]; Taylor series [14], [15]; and iterative approaches [16]–[18].”