Using a Grid-Forming Inverter to Stabilize a Low-Inertia Power System - Maui Hawaiian Island

Rick Kenyon, Amirhossein Sajadi, Andy Hoke, Bri-Mathias Hodge

Research output: Contribution to conferencePaperpeer-review

1 Scopus Citations

Abstract

As power systems around the world integrate greater amounts of wind and solar photovoltaic power, periods of very high instantaneous power shares of inverters, the primary interfacing technology for these generation sources, are complicating system stability and control. The contemporary, primary mode of inverter operation, grid-following, which explicitly assumes the presence of a local, stable voltage waveform, yields operational inadequacy at high instantaneous power shares potentially leading to instability due to the low-inertia conditions, as well as the correlated reduced voltage forming capacity on the respective system. Parallel connected grid-forming inverters, which directly regulate the local voltage, are a solution that is expected to bolster system stability and mitigate the shortcomings of the grid-following technology. In this paper, grid-following and two types of grid-forming inverter control, the traditional linear droop and the recently introduced nonlinear exponential droop (Droop-e), are simulated on a low-inertia, H = 0.48s, high inverter-based resource scenario, 97%, with a validated electromagentic transient domain model of the Hawaiian island of Maui power system. The benefit of a single grid-forming device over its grid-following counterpart is significant, both in terms frequency deviation and voltage stability. Further, the superiority of the Droop-e and the associated secondary power sharing control over both grid-following and linear droop grid-forming technologies is displayed, with improved nadir and rate of change of frequency over the linear droop control.

Original languageAmerican English
Number of pages6
DOIs
StatePublished - 2022
Event2022 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2022 - Novi Sad, Serbia
Duration: 10 Oct 202212 Oct 2022

Conference

Conference2022 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2022
Country/TerritorySerbia
CityNovi Sad
Period10/10/2212/10/22

Bibliographical note

Publisher Copyright:
© 2022 IEEE.

NREL Publication Number

  • NREL/CP-5D00-85139

Keywords

  • droop control
  • grid-forming inverters
  • low-inertia power systems
  • nonlinear droop

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