Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 70, Issue 8, Pages 8140-8150Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2022.3231274
Keywords
Phase locked loops; Frequency locked loops; Frequency estimation; Frequency control; Transient analysis; Frequency synchronization; Couplings; Amplitude estimation; decoupling; frequency-locked loop (FLL); grid synchronization; phase-locked loop (PLL); three-phase systems; transient response
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This article explains why amplitude and phase estimation loops in many grid synchronization systems are dynamically coupled, and provides guidelines to mitigate this coupling. Several case studies are presented, along with numerical and experimental results to clarify the issue.
In many grid synchronization systems (GSSs), amplitude and phase estimation loops are dynamically coupled. It means that a change in the input voltage amplitude may result in spurious phase/frequency transients in the GSS output and vice versa. This article aims to explain the reason behind this coupling and present some guidelines to mitigate it. Several case studies are provided, and numerical and experimental results are presented to make all this more clear.
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