Autonomous Grid-Forming Inverter Exponential Droop Control for Improved Frequency Stability
<|reference_start|>Autonomous Grid-Forming Inverter Exponential Droop Control for Improved Frequency Stability: This paper introduces the novel Droop-e grid-forming power electronic converter control strategy, which establishes a non-linear, active power--frequency droop relationship based on an exponential function of the power output. A primary advantage of Droop-e is an increased utilization of available power headroom that directly mitigates system frequency excursions and reduces the rate of change of frequency. The motivation for Droop-e as compared to a linear grid-forming control is first established, and then the full controller is described, including the mirrored inversion at the origin, the linearization at a parameterized limit, and the auxiliary autonomous power sharing controller. The analytic stability of the controller, including synchronization criteria and a small signal stability analysis, is assessed. Electromagnetic transient time domain simulations of the Droop-e controller with full order power electronic converters and accompanying DC-side dynamics, connected in parallel with synchronous generators, are executed at a range of dispatches on a simple 3-bus system. Finally, IEEE 39-bus system simulations highlight the improved frequency stability of the system with multiple, Droop-e controlled grid-forming inverters.<|reference_end|>
@article{kenyon2024autonomous,
    title={Autonomous Grid-Forming Inverter Exponential Droop Control for Improved
  Frequency Stability},
    author={Rick Wallace Kenyon, Amirhossein Sajadi, Bri-Mathias Hodge},
    journal={arXiv preprint arXiv:2408.12709},
    year={2024},
    archivePrefix={arXiv},
    eprint={2408.12709},
    primaryClass={eess.SY cs.SY}
}