Grid Strength Assessment for High Levels of Inverter-Based Resources in the Puerto Rico Power System

Melanie Bennett, Alexandre Nassif, Matin Rahmatian, Yilu Liu, Zhihao Jiang, Vahan Gevorgian, Xiaoyuan Fan, Marcelo Elizondo

Research output: Contribution to conferencePaper

Abstract

A system-wide assessment of the Puerto Rico power system grid strength is studied when considering high levels of inverter-based resource penetration. This study is carried out in PSSE and assesses the impact of inverter-based resource (IBR) contributions in response to three-phase ground faults. A hypothetical 100% renewable generation scenario is created to assess the extreme impact on short circuit levels and a realistic scenario is considered to assess the impact to short circuit ratios. The overall conclusion is that short circuit capacity and current will drastically decrease in a high IBR scenario, an effect that is quantified in this paper. The short circuit ratio metric is typically used to assess the impact of IBR but generally overestimates grid strength due to not accounting for the impact from multiple IBRs. Other methods such as equivalent circuit-based short circuit ratio and weighted short circuit ratio offer a more comprehensive consideration for multiple IBRs and can better account for their mutual interactions. The work presented in this paper is part of the PR100 study.
Original languageAmerican English
Pages35-39
Number of pages5
DOIs
StatePublished - 2023
Event2023 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT-LA) - San Juan, Puerto Rico
Duration: 6 Nov 20239 Jan 2024

Conference

Conference2023 IEEE PES Innovative Smart Grid Technologies Latin America (ISGT-LA)
CitySan Juan, Puerto Rico
Period6/11/239/01/24

NREL Publication Number

  • NREL/CP-5C00-88552

Keywords

  • grid strength
  • short circuit analysis
  • short circuit ratio

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