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

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Abstract

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.
Original languageEnglish
Title of host publication2021 IEEE 12th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
EditorsSudip K. Mazumder, Juan Carlos Balda, Lina He, Jianzhe Liu, Ankit Gupta
Number of pages6
Publication date2021
Pages1-6
Article number9494181
ISBN (Print)978-1-6654-4643-3
ISBN (Electronic)978-1-6654-0465-5
DOIs
Publication statusPublished - 2021
Event2021 IEEE 12th International Symposium on Power Electronics for Distributed Generation Systems - Chicago, IL, United States
Duration: 28 Jun 20211 Jul 2021

Conference

Conference2021 IEEE 12th International Symposium on Power Electronics for Distributed Generation Systems
Country/TerritoryUnited States
CityChicago, IL
Period28/06/202101/07/2021
SeriesIEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
ISSN2329-5767

Keywords

  • grid-following inverter
  • vector current control
  • small-signal model
  • stability enhancement
  • weak grid

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