Frequency estimation in DSOGI cells by means of the teager energy operator
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Pigazo López, Alberto; Azcondo Sánchez, Francisco Javier; Brañas Reyes, Christian; Lamo Anuarbe, PaulaFecha
2022Derechos
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Publicado en
IEEE 23rd Workshop on Control and Modeling for Power Electronics (COMPEL), Tel-Aviv, Israel, 2022
Editorial
Institute of Electrical and Electronics Engineers, Inc.
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Palabras clave
PLL
Synchronization
Three-phase
Converter
Second order generalized integrator
Resumen/Abstract
Second Order Generalized Integrator (SOGI) cells are used for notch filtering due to their simplicity and their harmonic rejection capability. SOGI and Dual SOGI (DSOGI) filter cells, combined with Frequency Locked Loops (FLL) to adjust the notch frequency, are commonly used in both 1f and 3f grid following (GFL) power converters for synchronization, i.e. SOGI-FLL and DSOGI-FLL, respectively. The FLL relies on a gradient descent method to minimize a cost function built up around one inner SOGI cell variable, e.g., the in-quadrature voltage estimation, and one outer variable, i.e. the error signal due to the SOGI filter cell. As a result, the FLL manages relatively large DC offsets and harmonic distortion passing through the outer SOGI cell variable, which deteriorates the frequency estimation and then, the SOGI-FLL performance. To attenuate such issues, the method proposed in this digest only uses inner SOGI cell variables. It minimizes the deviation between the estimated grid frequency and the frequency of the signal across the SOGI cell, which is detected through the Teager Energy Operator (TEO). The proposal is validated in simulation and experimentally.
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