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DOE OSTI · 1668283

Distributed Small-Signal Stability Conditions for Inverter-Based Unbalanced Microgrids

Nandanoori, Sai Pushpak·Kundu, Soumya·Du, Wei·Tuffner, Frank K.·Schneider, Kevin P.
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Abstract

The proliferation of inverter-based generation and advanced sensing, controls, and communication infrastructure have facilitated accelerated deployment of microgrids. A coordinated network of microgrids can maintain reliable power delivery to critical facilities during extreme events. Low-inertia offered by the power-electronics–interfaced energy resources, however, can present significant challenges to ensuring stable operation of the microgrids. In this work, distributed small-signal stability conditions for inverter-based microgrids are developed that involve the droop-controller parameters and the network parameters (e.g. line impedances, loads). The distributed closed-form parametric stability conditions derived in this paper can be verified in a computationally efficient manner, facilitating reliable design and operations of networks of microgrids. Dynamic phasor models have been used to capture the effects of electromagnetic transients. Furthermore, numerical results are presented, along with PSCAD simulations, to validate the analytical stability conditions. Effects of design choices, such as the conductor types, and inverter sizes, on the small-signal stability of inverter-based microgrids are investigated to derive useful engineering insights.

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24 POWER TRANSMISSION AND DISTRIBUTIONdroop controlinverter-based microgridnetworked microgridsmall-signal stability

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Nandanoori, Sai Pushpak, Kundu, Soumya, Du, Wei, Tuffner, Frank K., Schneider, Kevin P.. 2020-03-30. Distributed Small-Signal Stability Conditions for Inverter-Based Unbalanced Microgrids. https://doi.org/10.1109/tpwrs.2020.2982795

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