Efficient Phasor Estimation Under Steady State and Dynamic Conditions

Phasor estimation has many application areas and has therefore attracted significant research focus. Classical phasor estimation proposed many years ago, considers the phasor to be time independent which means constant amplitude and phase. However, the dynamic phasor concept introduced recently, improves the accuracy of the phasor estimation under a nonstationary signal as is typically the case of low frequency oscillations (LFO). However, more accurate estimates lead to higher computation time. To achieve both low computation time and more accurate estimates, an adaptive phasor estimation concept based on both static and dynamic phasors is proposed in this paper. A new method based on the Adaptive Prony algorithm is presented, in which the Static Prony is employed under steady state conditions and the Dynamic Prony under dynamic conditions. To switch between these two algorithms, a Cumulative Summation of the Phasor Estimation Error (CSPEE) is used. Simulation results show the applicability of the proposed method to achieve the most accurate estimates at the lowest computation time. Total Vector Error (TVE) and Floating Point Operation (FLOP) are used to evaluate the proposed method.