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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.
Original language | English |
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Article number | 8468126 |
Journal | IEEE Transactions on Power Electronics |
Volume | 34 |
Issue number | 5 |
Pages (from-to) | 4000-4004 |
Number of pages | 5 |
ISSN | 0885-8993 |
DOIs | |
Publication status | Published - May 2019 |
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
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Dive into the research topics of 'A Fixed-Length Transfer Delay Based Adaptive Frequency-Locked Loop for Single-Phase Systems'. Together they form a unique fingerprint.Projects
- 1 Finished
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PV2GRID: A Next-Generation Grid Side Converter with Advanced Control and Power Quality Capabilities
Blaabjerg, F., Yang, Y. & Sangwongwanich, A.
01/01/2015 → 30/09/2017
Project: Research