Robust Estimation and Tracking of Power System Harmonics Using an Optimal Finite Impulse Response Filter

• Main Authors: Bo-kyu Kwon, Soohee Han, Kwang Y. Lee
• Format: Article
• Language: English
• Published: MDPI AG 2018-07-01
• Series: Energies
• Subjects: robust harmonics estimation; power system harmonics; optimal FIR filter; power conditioning system; total harmonic distortions
• Online Access: http://www.mdpi.com/1996-1073/11/7/1811

In this paper, a robust estimation method for estimating the power system harmonics is proposed by using the optimal finite impulse response (FIR) filter. The optimal FIR filter is applied to the state space representation of the noisy current or voltage signal and estimates the magnitude and phase-angle of the harmonic components. Due to the FIR structure, the FIR filter is more robust against model uncertainty than the Kalman filter. Hence, the FIR filter-based method will give a more robust solution for the power system harmonic estimation than the previous Kalman filter-based approaches. The performance and robustness of the proposed method are verified through simulation. Moreover, the proposed method is employed in the power conditioning system to estimate the harmonic components and total harmonic distortions.