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Understanding Impacts of Frequency Calculations on Underfrequency Load Shedding

Conference ·
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Power system fundamental frequency-dependent protection decisions and control decisions are increasingly common in the distribution system space. Understanding the algorithms used in frequency measurements is critical to understanding the decisions made by the many intelligent electronic devices in the power system. These decisions are critically important for reliability analysis for interconnected power systems as they bear directly on resource planning to mitigate under-frequency conditions that would result in under-frequency load shedding (UFLS). This work aims to improve the understanding of frequency measurement algorithms, evaluate the intelligent electronic devices that use frequency measurements for decision making, and understand the algorithms' direct impact on frequency related decision making. First, this work presents background information on the use of frequency measurements in protection logic, specifically UFLS. Second, the paper presents a relay hardware evaluation test bed used to detect and protect systems from under-frequency events. Finally, the paper presents the dynamic events used to evaluate commercially available, off-the-shelf relay equipment and the results from the relay evaluation.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
Hawaiian Electric
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1996401
Report Number(s):
NREL/CP-5D00-85523; MainId:86296; UUID:e17dd9db-056d-4c04-81aa-d7663d2d6abb; MainAdminID:70282
Resource Relation:
Conference: Presented at the 2023 IEEE Rural Electric Power Conference (REPC), 25-28 April 2023, Cleveland, Ohio
Country of Publication:
United States
Language:
English

References (2)

Evaluating Methods for Measuring Grid Frequency in Low-Inertia Power Systems conference April 2022
Primary frequency control techniques for large-scale PV-integrated power systems: A review journal July 2021

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Related Subjects

POWER TRANSMISSION AND DISTRIBUTION
COMTRADE
controller evaluation
frequency measurement
phase-locked loop
playback
relay evaluation
under-frequency load shedding