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

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

doi:10.1109/tpwrs.2020.2982795

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

Journal Article · 30 March 2020 · IEEE Transactions on Power Systems

DOI: https://doi.org/10.1109/tpwrs.2020.2982795 · OSTI ID:1668283

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Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

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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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1668283

Report Number(s):: PNNL-SA-146963

Journal Information:: IEEE Transactions on Power Systems, Vol. 35, Issue 5; ISSN 0885-8950

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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