A Modified SOGI-PLL with Adjustable Refiltering for Improved Stability and Reduced Response Time

Gilberto A. Herrejón-Pintor, Enrique Melgoza-Vázquez and Jose de Jesús Chávez
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Gilberto A. Herrejón-Pintor: Tecnológico Nacional de México/Instituto Tecnológico de Morelia, Morelia 58120, Mexico
Enrique Melgoza-Vázquez: Tecnológico Nacional de México/Instituto Tecnológico de Morelia, Morelia 58120, Mexico
Jose de Jesús Chávez: Tecnológico Nacional de México/Instituto Tecnológico de Morelia, Morelia 58120, Mexico

Energies, 2022, vol. 15, issue 12, 1-20

Abstract: The controls of most power electronic inverters connected to an electrical power system (EPS) rely on the precise determination of the voltage magnitude, frequency, and phase angle at the point of common coupling. One of the most widely used approaches for measuring these quantities is the phase-locked loop (PLL); however, the precision of this measurement is affected during transients in the EPS and is a function of the type of event and the architecture of the PLL. PLLs based on the second-order generalized integrator (SOGI) are widely used in power converter synchronization, offering an adaptive or fixed-parameter prefilter with low-pass and band-pass characteristics. This article proposes a variant of the SOGI-PLL that offers improved stability and a faster response time. This is accomplished by decoupling the effect of the SOGI’s gains and adding feedback. The modification is carried out in the state space model of the SOGI. Manipulating the attenuation moves the poles of the SOGI to improve the stability. The performance of the proposed PLL is verified and validated under the processor-in-the-loop (PIL) approach.

Keywords: synchronization; phase-locked loop; renewable energy resources; processor-in-the-loop (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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