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

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Abstrakt

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.
OriginalsprogEngelsk
Titel2021 IEEE 22nd Workshop on Control and Modelling of Power Electronics (COMPEL)
Antal sider6
Publikationsdato2021
Sider1-6
ISBN (Trykt)978-1-6654-3636-6
ISBN (Elektronisk)978-1-6654-3635-9
DOI
StatusUdgivet - 2021
Begivenhed2021 IEEE 22nd Workshop on Control and Modeling for Power Electronics, COMPEL 2021 - Cartagena, Colombia
Varighed: 2 nov. 20215 nov. 2021

Konference

Konference2021 IEEE 22nd Workshop on Control and Modeling for Power Electronics, COMPEL 2021
Land/OmrådeColombia
ByCartagena
Periode02/11/202105/11/2021

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