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Grid-forming control of doubly-fed induction generators based on the rotor flux orientation

Author

Listed:
  • Martínez, Jesús Castro
  • Rodríguez Amenedo, José Luis
  • Arnaltes Gómez, Santiago
  • Alonso-Martínez, Jaime

Abstract

The increasing penetration of renewable energies in power systems demands new services from renewable generation plants. System operators are concerned about system stability since renewable generators behave as constant power sources. Therefore, new requirements have been imposed to grid-following generators to improve their contribution to system stability acting as grid-supporting generators. Nevertheless, grid-supporting control can still compromise system stability for high penetration of renewables, and grid-forming control has arised to ensure proper operation. This paper proposes a novel grid-forming control scheme for doubly-fed induction generators, so they behave as real voltage sources. The proposed grid-forming control is based on the rotor flux orientation to a reference axis obtained from the emulation of the synchronous generator swing equation. The rotor flux is oriented to the reference axis by means of a flux controller that also controls the flux magnitude. The flux orientation in turn allows to control the doubly-fed induction generator torque, while the flux magnitude control allows to regulate the generator reactive power or terminal voltage. The proposed control system has been validated through a comprehensive real-time simulation with hardware in the loop, assessing its grid-forming capability. Moreover, small signal analysis has also been performed to assess system stability.

Suggested Citation

  • Martínez, Jesús Castro & Rodríguez Amenedo, José Luis & Arnaltes Gómez, Santiago & Alonso-Martínez, Jaime, 2023. "Grid-forming control of doubly-fed induction generators based on the rotor flux orientation," Renewable Energy, Elsevier, vol. 207(C), pages 162-176.
    • Handle: RePEc:eee:renene:v:207:y:2023:i:c:p:162-176
    DOI: 10.1016/j.renene.2023.02.133
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    References listed on IDEAS

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    1. Jesus Castro Martinez & Santiago Arnaltes & Jaime Alonso-Martinez & Jose Luis Rodriguez Amenedo, 2021. "Contribution of Wind Farms to the Stability of Power Systems with High Penetration of Renewables," Energies, MDPI, vol. 14(8), pages 1-21, April.
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