A Simplified SISO Small-Signal Model for Analyzing Instability Mechanism of Grid-Forming Inverter under Stronger Grid

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Abstract

Different from grid-following inverters, grid-forming (GFM) inverters tend to be unstable under stronger grid conditions. However, the instability mechanism is still absent in existing research. To fill this gap, the full-order multiple-input multiple-output (MIMO) small-signal model of the GFM inverter is simplified as a single-input single-output (SISO) model on quadrature axis, so that the destabilizing factor can be clearly observed. Based on this SISO model, it is revealed that the power synchronization loop introducing an integral term into the voltage control loop is the main reason for instability. Decreasing the grid strength or the power droop gain can reduce the gain of the integral term and enhance stability. Finally, simulation and experimental results verify the effectiveness of theoretical analysis.
Original languageEnglish
Title of host publication2021 IEEE 22nd Workshop on Control and Modelling of Power Electronics (COMPEL)
Number of pages6
Publication date2021
Pages1-6
ISBN (Print)978-1-6654-3636-6
ISBN (Electronic)978-1-6654-3635-9
DOIs
Publication statusPublished - 2021
Event2021 IEEE 22nd Workshop on Control and Modeling for Power Electronics, COMPEL 2021 - Cartagena, Colombia
Duration: 2 Nov 20215 Nov 2021

Conference

Conference2021 IEEE 22nd Workshop on Control and Modeling for Power Electronics, COMPEL 2021
Country/TerritoryColombia
CityCartagena
Period02/11/202105/11/2021

Keywords

  • grid-forming inverter
  • simplified small-signal model
  • sub-synchronous oscillation
  • instability mechanism

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