Harmonic transfer-function model of three-phase synchronous reference frame PLL under unbalanced grid conditions

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Abstrakt

The synchronous reference frame (SRF) phase-locked loop (PLL) is widely used in three-phase grid-connected converter systems. For the balanced grid condition, the PLL can be linearized in the dq frame, and the derived small-signal model is linear time-invariant (LTI), which can be readily analyzed with classical control theories. However, in the unbalanced grid, the presence of the negative-sequence voltage leads to frequency-coupling dynamics in the SRF-PLL, which cannot be characterized by the dq-frame LTI model. This paper thus proposes a harmonic transfer-function model of the SRF-PLL under three-phase unbalanced grid conditions based on the linear time-periodic theory. It is found that the negative-sequence voltage can result in considerable phase error, which yields three time-periodic coefficients in the dynamic model of SRF-PLL. Simulations and experimental results corroborate the effectiveness of the model. The frequency-coupling effects are verified in the time domain and the frequency domain.
OriginalsprogEngelsk
TitelProceedings of the 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
Antal sider8
ForlagIEEE Press
Publikationsdatomar. 2019
Sider58-65
Artikelnummer8721842
ISBN (Trykt)978-1-5386-8331-6
ISBN (Elektronisk)978-1-5386-8330-9
DOI
StatusUdgivet - mar. 2019
Begivenhed34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 - Anaheim, USA
Varighed: 17 mar. 201921 mar. 2019

Konference

Konference34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
LandUSA
ByAnaheim
Periode17/03/201921/03/2019
SponsorIEEE Industry Applications Society (IAS), IEEE Power Electronics Society (PELS), Power Sources Manufacturers Association (PSMA)
NavnIEEE Applied Power Electronics Conference and Exposition (APEC)
ISSN2470-6647

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