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Adaptive Phasor Estimation Algorithm Based on a Least Squares Method

Department of Electrical Engineering, Myongji University, Yongin 17058, Korea
Author to whom correspondence should be addressed.
Energies 2019, 12(7), 1387;
Received: 11 March 2019 / Revised: 2 April 2019 / Accepted: 7 April 2019 / Published: 10 April 2019
(This article belongs to the Special Issue Electric Power Systems Research 2019)
PDF [3007 KB, uploaded 12 April 2019]


This paper proposes an adaptive phasor estimation algorithm based on a least square method that can suppress the adverse effect of an exponentially decreasing DC offset component in a phasor estimation process. The proposed algorithm is composed of three stages: a basic least squares model, a time constant calculation, and an adaptive least squares model. First, we use the basic least squares model to estimate the parameter of the DC offset component in the fault current signal. This model is designed to incorporate fundamental frequency, and harmonic and constant components. Second, we use the estimated parameter to calculate the time constant of the DC offset component. Third, we redesign a least squares model that incorporates fundamental frequency, harmonic components, and exponential function of the DC offset component. Since this model incorporates the exponential function of the DC offset component contained in the fault current signal, it estimates the phasor of the correct fundamental frequency component without influence of the DC offset component. We evaluated the performance of the proposed algorithm using computer generated signals and EMTP simulation signals. The evaluation results show that the proposed algorithm can effectively suppress the adverse influence of the exponentially decaying DC offset component. View Full-Text
Keywords: least squares method; phasor estimation; DC offset least squares method; phasor estimation; DC offset

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Kim, W.-J.; Nam, S.-R.; Kang, S.-H. Adaptive Phasor Estimation Algorithm Based on a Least Squares Method. Energies 2019, 12, 1387.

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