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arXiv · 2408.12709

Autonomous Grid-Forming Inverter Exponential Droop Control for Improved Frequency Stability

Rick Wallace Kenyon·Amirhossein Sajadi·Bri-Mathias Hodge
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Abstract

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.

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Rick Wallace Kenyon, Amirhossein Sajadi, Bri-Mathias Hodge. 2024-08-22. Autonomous Grid-Forming Inverter Exponential Droop Control for Improved Frequency Stability. https://arxiv.org/abs/2408.12709

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