A Simple Impedance Reshaping Method for Stability Enhancement of Grid-Following Inverter Under Weak Grid

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Abstrakt

The conventional vector current control (VCC) scheme has been widely used in the grid-connected inverter systems. However, it suffers from power limitation problems under weak grid conditions. This paper reveals that the dynamic effect of the phase-locked loop (PLL) is the main reason for destabilizing the small-signal stability of the grid-following inverter. The positive feedback introduced by the PLL can be observed from the small-signal control structure. Reshaping the converter output impedance can counteract the positive feedback and reduce the negative resistance in the impedance model. A novel impedance reshaping method is proposed in this paper, which can enhance the small-signal stability and extend the stability range of the system. Simulation results verify the effectiveness of the proposed method.
OriginalsprogEngelsk
Titel2021 IEEE 12th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
RedaktørerSudip K. Mazumder, Juan Carlos Balda, Lina He, Jianzhe Liu, Ankit Gupta
Antal sider6
Publikationsdato2021
Sider1-6
Artikelnummer9494181
ISBN (Trykt)978-1-6654-4643-3
ISBN (Elektronisk)978-1-6654-0465-5
DOI
StatusUdgivet - 2021
Begivenhed2021 IEEE 12th International Symposium on Power Electronics for Distributed Generation Systems - Chicago, IL, USA
Varighed: 28 jun. 20211 jul. 2021

Konference

Konference2021 IEEE 12th International Symposium on Power Electronics for Distributed Generation Systems
Land/OmrådeUSA
ByChicago, IL
Periode28/06/202101/07/2021
NavnIEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
ISSN2329-5767

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