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

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5 Citationer (Scopus)
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Resumé

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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Electric potential
Linear regression
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title = "A Fixed-Length Transfer Delay Based Adaptive Frequency-Locked Loop for Single-Phase Systems",
abstract = "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.",
keywords = "Delays, Estimation error, Frequency estimation, Frequency locked loop (FLL), Frequency locked loops, Harmonic analysis, Phase locked loops, Steady-state, Fixed-length transfer delay, Frequency variations, Grid synchronization, Single-phase systems",
author = "Z. Dai and Z. Zhang and Yongheng Yang and Frede Blaabjerg and Y. Huangfu and J. Zhang",
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A Fixed-Length Transfer Delay Based Adaptive Frequency-Locked Loop for Single-Phase Systems. / Dai, Z.; Zhang, Z.; Yang, Yongheng; Blaabjerg, Frede; Huangfu, Y.; Zhang, J.

I: IEEE Transactions on Power Electronics, Bind 34, Nr. 5, 8468126, 05.2019, s. 4000-4004.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - A Fixed-Length Transfer Delay Based Adaptive Frequency-Locked Loop for Single-Phase Systems

AU - Dai, Z.

AU - Zhang, Z.

AU - Yang, Yongheng

AU - Blaabjerg, Frede

AU - Huangfu, Y.

AU - Zhang, J.

PY - 2019/5

Y1 - 2019/5

N2 - 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.

AB - 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.

KW - Delays

KW - Estimation error

KW - Frequency estimation

KW - Frequency locked loop (FLL)

KW - Frequency locked loops

KW - Harmonic analysis

KW - Phase locked loops

KW - Steady-state

KW - Fixed-length transfer delay

KW - Frequency variations

KW - Grid synchronization

KW - Single-phase systems

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U2 - 10.1109/TPEL.2018.2871032

DO - 10.1109/TPEL.2018.2871032

M3 - Journal article

VL - 34

SP - 4000

EP - 4004

JO - I E E E Transactions on Power Electronics

JF - I E E E Transactions on Power Electronics

SN - 0885-8993

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