Impact of low inertia and high distributed generation on the effectiveness of under frequency load shedding schemes

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Abstract

The Under-Frequency Load Shedding Scheme (UFLS) is an emergency measure in place to prevent system collapse in the event of a large generation deficit relative to demand at any moment in time. However, the effectiveness of traditional UFLS schemes may be compromised as network power flows change due to the growth of distributed generation (DG) and a reduction in system inertia. This study has shown some of the issues affecting the UFLS protection system with rising installed capacities of DG in the Great Britain power system. Simulation results show how the effectiveness of the scheme is challenged with current and future expected DG installed capacities and the risk of over shedding demand due to the schemes current settings is evaluated. Many proposed improvements to traditional load shedding schemes are based on upgrades to network monitoring and communication systems, which are not yet fully available. This study evaluates more readily available solutions, including the relocation of under-frequency relays and reducing the time delay of the scheme, which may provide interim improvements to the UFLS scheme, based on a case study in GB.
Original languageEnglish
Number of pages10
JournalIEEE Transactions on Power Delivery
Early online date21 Dec 2021
DOIs
Publication statusE-pub ahead of print - 21 Dec 2021

Keywords

  • under frequency load shedding
  • distributed generation
  • low inertia
  • frequency stability
  • uncertainty analysis
  • power system dynamics

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