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Performance Analysis and Control Development of Grid-Forming Voltage Source Converters for Asymmetrical Fault Ride-through in Compliance with IEEE 2800-2022 Standard

Haghshenas Fatmehsari, Moein | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58667 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Ravanji, Mohammad Hassan; Parniani, Mostafa
  7. Abstract:
  8. With the increasing penetration of inverter-based resources (IBRs) into power systems, grid codes and technical standards have placed growing emphasis on their performance under transient and fault conditions. The IEEE 2800-2022 standard requires all IBRs to remain connected during grid faults and to be capable of injecting both positive- and negative-sequence currents. In this research, the performance and controller design of grid-forming inverters (GFMs) are investigated with the aim of improving their capability to ride through asymmetrical faults while ensuring compliance with the standard requirements. To this end, various methods for symmetrical component extraction (SCE) of voltage and current are evaluated and compared. Previous studies on SCE methods have largely focused on grid-following applications, where grid frequency extraction is required. In this thesis, different SCE approaches are examined for GFM applications, and their performance is assessed within the proposed control framework under asymmetrical fault conditions. Furthermore, by modeling the inverter’s equivalent circuit during faults, an adaptive virtual impedance structure is implemented to limit the steady-state fault current. In addition, a transient virtual resistance (TVR) structure without an internal control loop is introduced and designed to limit the initial fault current surge. The proposed method does not rely on current saturation limiters and consistently preserves the voltage-source behavior of the inverter. Simulation results under various single-phase and two-phase fault scenarios demonstrate that the proposed strategy not only improves performance and maintains voltage controllability but also fulfills the IEEE 2800-2022 requirements while offering reduced delay and enhanced transient response compared to conventional methods
  9. Keywords:
  10. Current Limiting Strategy ; Institute Electrical and Electronic Engineers (IEEE)2800-2022 Standard ; Symmetrical Components Extraction ; Grid-Forming Inverters ; Unsymmetrical Faults ; Virtual Impedance

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