Multi-resonant frequency-locked loop for grid synchronization of power converters under distorted grid conditions
PublisherIEEE Press. Institute of Electrical and Electronics Engineers
Rights accessOpen Access
This paper presents a new multiresonant frequencyadaptive synchronization method for grid-connected power converters that allows estimating not only the positive- and negative-sequence components of the power signal at the fundamental frequency but also other sequence components at other harmonic frequencies. The proposed system is calledMSOGI-FLL since it is based on both a harmonic decoupling network consisting of multiple second-order generalized integrators (MSOGIs) and a frequency-locked loop (FLL), which makes the system frequency adaptive. In this paper, the MSOGI-FLL is analyzed for singleand three-phase applications, deducing some key expressions regarding its stability and tuning. Moreover, the performance of the MSOGI-FLL is evaluated by both simulations and experiments to show its capability for detecting different harmonic components in a highly polluted grid scenario.
CitationRodriguez, P. [et al.]. Multi-resonant frequency-locked loop for grid synchronization of power converters under distorted grid conditions. "IEEE transactions on industrial electronics", Gener 2011, vol. 58, núm. 1, p. 127-138.