A Fixed-Length Transfer Delay Based Adaptive Frequency-Locked Loop for Single-Phase Systems

Z. Dai, Z. Zhang, Yongheng Yang, Frede Blaabjerg, Y. Huangfu, J. Zhang

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

10 Citationer (Scopus)
236 Downloads (Pure)

Abstrakt

This letter presents an adaptive frequency-locked loop (FLL) with fixed-length transfer delay units for single-phase systems. By analyzing the relationship between the grid voltage and its transfer delay signals, a linear regression model of the grid voltage is established. Accordingly, a transfer delay based adaptive FLL (TD-AFLL) is proposed. A mathematic proof indicates that the proposed TD-AFLL can reject both phase offset errors and double-frequency oscillatory errors. Thus, the grid voltage parameters can be estimated accurately, even when the frequency drifts away from its nominal value. Moreover, fast dynamics of the TD-AFLL are achieved due to the transfer delay structure. Experiments verify the effectiveness of the proposed method.

OriginalsprogEngelsk
Artikelnummer8468126
TidsskriftIEEE Transactions on Power Electronics
Vol/bind34
Udgave nummer5
Sider (fra-til)4000-4004
Antal sider5
ISSN0885-8993
DOI
StatusUdgivet - maj 2019

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