PA New LPF-Based Grid Frequency Estimation for the SOGI Filter with Improved Harmonic Rejection J. Matas, H. Martin, J. Elmariachet, A. Abusorrah and Y. Al-Turki 2018/04/20

Abstract

This paper proposes a new method for the estimation of the grid voltage frequency using a low-pass filter (LPF) approach. The estimated frequency is used to tune a second order generalized integrator (SOGI) filter commonly used for grid monitoring purposes and applications requiring parameter estimation from the grid. A first-order LPF is used first for the estimation that behaves identically to the reported normalized SOGI-FLL. A second-order LPF is proposed instead to overcome this circumstance. The behavior of this approach is dynamically analyzed and a linearized model useful for design purposes is derived. The behavior of the proposed system is checked with simulations, showing that the model matches well with the real system and has a smoother transient response to step frequency perturbations and also a better rejection to harmonic distortion than previous approaches.

Authors and affiliations

J. Matas†, H. Martin†, J. Elmariachet†, A. Abusorrah* and Y. Al-Turki*,
† Department of Electric Engineering, Barcelona East School of Engineering (EEBE), Universidad Politécnica de Cataluña (UPC), Barcelona, Spain.
*Department of Electrical and Computer Engineering, King Abdulaziz University (KAU), Jeddah, Saudi Arabia.

Key words

Grid voltage monitoring, SOGI filter, harmonic distorion, power quality.

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