Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 11, Pages 12949-12954Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3181335
Keywords
Transient analysis; Frequency locked loops; Frequency estimation; Power quality; Power harmonic filters; Harmonic analysis; Tuning; Frequency-locked loop (FLL); rate limiter; soft startup; transient analysis
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This letter demonstrates the application and performance of the second-order generalized integrator-based frequency-locked loop (SOGI-FLL) in soft startup and rate limiting. When properly tuned, the soft startup and limiter show similar performance. However, they have a deceleration blind zone depending on frequency constraints and SOGI gain. The fast response FLL can mitigate this shortcoming.
This letter demonstrates that the second-order generalized integrator-based frequency-locked loop (SOGI-FLL) with a soft startup/rate limiter essentially incorporates an adaptive feedforward relying on a priori information of transient input. When a fair parameter is tuned, the soft startup and the limiter give a similar performance. The shortcoming is that they have a deceleration blind zone, depending on the frequency constraints and SOGIs gain. If the allowed rate of change of frequency (RoCoF) is fixed, the fast response FLL can weaken this shortcoming. Specifically, if the RoCoF of low-inertia grids is considered, they could produce a severely biased estimation under the harmonics and dc offsets. The experimental results are given to validate the claims.
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