Abstract
A phase locked loop method is proposed for fast estimation of utility grid frequency, for control and protection purposes in grid-connected power converters. Using a second order generalized integrator (SOGI) and a ‘novel’ frequency locked loop (nFLL), which makes the SOGI frequency adaptive, the proposed SOGI-nFLL detects small and large step changes in frequency with fast response and without large overshoot. In this paper, the SOGI-nFLL method is analyzed, simulated and implemented in a Field Programmable Gate Array (FPGA). Its performance is compared with the original SOGI-FLL using simulations and experimental data. The experimental results verify that the proposed method results in smoother transients for frequency detection that may be used to reliably activate over-frequency protection within a half cycle.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
