THE METHOD FOR DETERMINING THE EFFECTIVE TOTAL LOAD SHEDDING FOR UNDER-FREQUENCY LOAD SHEDDING OF THE POWER SYSTEM
This paper suggests a method for determining the effective total amount of load disconnection in case of major frequency drop and under-frequency load shedding (UFLS) activation. A mathematical model of power balance in emergency areas has been developed, which uses the structure of the el...
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| Date: | 2025 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | English |
| Published: |
Institute of Renewable Energy National Academy of Sciences of Ukraine
2025
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| Subjects: | |
| Online Access: | https://ve.org.ua/index.php/journal/article/view/501 |
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| Journal Title: | Vidnovluvana energetika |
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Vidnovluvana energetika| Summary: | This paper suggests a method for determining the effective total amount of load disconnection in case of major frequency drop and under-frequency load shedding (UFLS) activation.
A mathematical model of power balance in emergency areas has been developed, which uses the structure of the electric network scheme.
The UFLS is presented in the model by a set of frequency relays with fixed consumer loads behind feeders along the year and binary variables triggering their operation.
The solution of the integer linear programming problem provides the optimal set of the relays needed to balance all emergency areas given the minimum total load shedding (TLS).
This determines both the TLS and the placement of individual relays in the electrical network.
The method involves pre-measurement of the consumer loads behind feeders, as well as power flows in the network for its characteristic modes.
For this purpose, standard specialized software is used to calculate stationary modes and contingency analysis.
The input data for the simulation is also a set of electrically unconnected emergency areas.
This information should be provided by the user of the proposed method by indicating the overhead line cross-sections in electric network.
The developed method allows to determine the TLS of UFLS and the most efficient set of frequency relays for any power system in order to align these indicators with the requirements of the National Electricity Transmission System Operator.
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