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 penetration 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 penetration level of grid-following inverters, and grid-forming inverter control can potentially improve system stability, thereby enabling very high level of DERs.
Original language | American English |
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Number of pages | 8 |
State | Published - 2021 |
Event | 2021 IEEE Power and Energy Society General Meeting - Duration: 25 Jul 2021 → 29 Jul 2021 |
Conference
Conference | 2021 IEEE Power and Energy Society General Meeting |
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Period | 25/07/21 → 29/07/21 |
Bibliographical note
See NREL/CP-5D00-82280 for paper as published in proceedingsNREL Publication Number
- NREL/CP-5D00-78448
Keywords
- grid-following inverter
- grid-forming inverter
- inverter-based resources
- modal analysis
- power system stability
- small-signal stability