Operation of Grid Forming Converters as Self Excited Induction Generators Under Non-Ideal Loading Conditions

Research output: Contribution to conferencePaper


Self-excited induction generators offer a robust solution for power production for standalone as well as grid-connected systems. In general, self-excited induction generators require excitation capacitors which make use of the machine magnetization characteristics for voltage build up process as well as operation at a specific frequency. In this paper, a self-excited induction machine is modeled with both the electrical and mechanical dynamics. This modeled virtual machine's dynamics are utilized for voltage build up process for a standalone photovoltaic converter connected to a local load for a microgrid application. The modeled machine's parameters are used from the name plate rating from the manufacturer. However, in a microgrid the accommodation of unbalanced and/or nonlinear harmonic rich load is a necessity, therefore, in this work the virtual self-excitation capacitors of the modeled machine are varied based on the machine characteristics. With the objective of ensuring harmonic free point of common coupling voltage, the modeled virtual self-excitation capacitors are varied to accomplish change in terminal frequency and the virtual load torque is varied to obtain voltage magnitude change. To verify the efficacy, the overall system is modeled in MATLAB/Simulink and PLECS domain and most important case studies are presented.
Original languageAmerican English
Number of pages5
StatePublished - 2024
EventApplied Power Electronics Conference 2024 - Long Beach, CA
Duration: 25 Feb 202429 Feb 2024


ConferenceApplied Power Electronics Conference 2024
CityLong Beach, CA

NREL Publication Number

  • NREL/CP-5D00-90031


  • grid forming converters (GFM)
  • self-excited induction generators (SEIG)
  • virtual model of SEIG


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