Unified Impedance Model of Grid-Connected Voltage-Source Converters

Publikation: Forskning - peer reviewTidsskriftartikel

Abstract

This paper proposes a unified impedance model of grid-connected voltage-source converters for analyzing dynamic influences of the Phase-Locked Loop (PLL) and current control. The mathematical relations between the impedance models in the different domains are first explicitly revealed by means of complex transfer functions and complex space vectors. A stationary (αβ-) frame impedance model is then proposed, which not only predicts the stability impact of the PLL, but reveals also its frequency coupling effect explicitly. Furthermore, the impedance shaping effect of the PLL on the current control in the rotating ( dq -) frame and the stationary (αβ-) frame are structurally characterized. The frequency-domain case studies on a three-phase grid-connected converter are next presented, and subsequently validated in time-domain simulations and experimental tests. The close correlations between the measured results and theoretical analysis confirm the effectiveness of the stationary-frame impedance model.
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Detaljer

This paper proposes a unified impedance model of grid-connected voltage-source converters for analyzing dynamic influences of the Phase-Locked Loop (PLL) and current control. The mathematical relations between the impedance models in the different domains are first explicitly revealed by means of complex transfer functions and complex space vectors. A stationary (αβ-) frame impedance model is then proposed, which not only predicts the stability impact of the PLL, but reveals also its frequency coupling effect explicitly. Furthermore, the impedance shaping effect of the PLL on the current control in the rotating ( dq -) frame and the stationary (αβ-) frame are structurally characterized. The frequency-domain case studies on a three-phase grid-connected converter are next presented, and subsequently validated in time-domain simulations and experimental tests. The close correlations between the measured results and theoretical analysis confirm the effectiveness of the stationary-frame impedance model.
OriginalsprogEngelsk
TidsskriftI E E E Transactions on Power Electronics
Volume/Bind33
Tidsskriftsnummer2
Sider (fra-til)1775 - 1787
Antal sider13
ISSN0885-8993
DOI
StatusUdgivet - feb. 2018
PublikationsartForskning
Peer reviewJa
ID: 252935450