Paper
Impact of Increased Inverter-based Resources on Power System Small-signal Stability
Published Jul 26, 2021 · Yashen Lin, Gab-Su Seo, Sanjana Vijayshankar
2021 IEEE Power & Energy Society General Meeting (PESGM)
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Abstract
The transformation of the power system to include more distributed energy resources (DER) implies an increase in the number of inverter-based resources deployed on the grid. Envisioning future scenarios, this paper presents a small-signal stability analysis for a power grid comprising synchronous generators and inverter-based resources. Three types of inverter control are considered: grid following, droop-controlled grid forming, and virtual oscillator control grid forming. Although small-signal stability of power systems is a widely studied topic, systematic analysis of mixed machine-inverter systems with detailed control models at various inverter levels are limited. This paper addresses the gap with numerical simulations tailored to the IEEE 39-bus system. Results show the system may become unstable at high inverter level of grid-following inverters, and grid-forming inverter control can potentially improve system stability, thereby enabling very high level of DERs.
Grid-forming inverter control can potentially improve power system stability, enabling higher levels of distributed energy resources.
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