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Dynamic Line Rating and Transformer-Life-Loss-Related Unit Commitment Under Extreme High-Temperature Conditions

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Argitaratua izan da:Electronics vol. 14, no. 20 (2025), p. 4027-4045
Egile nagusia: Zhou, Hong
Beste egile batzuk: Lu, Liang, Yang, Ke, Shen, Li, Wen Yiyu, Wang, Qing
Argitaratua:
MDPI AG
Gaiak:
Heat transfer
Failure
Electrical loads
Cooling
Thermal stability
Temperature dependence
Temperature effects
Cost function
Electric power transmission
Aging
Optimization
Ambient temperature
Weather
Power lines
Power supply
Damage accumulation
Unit commitment
Operating costs
High temperature
Transformers
Radiation
Optimization models
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Laburpena:The increasing frequency of extreme high-temperature events has led to deteriorating thermal stability in power transmission lines and accelerated life of transformers. Conventional unit commitment (UC) employs static line rating (SLR) and neglects transformer lifetime degradation, posing hidden risks to system security in high-temperature and heavy-load scenarios. To address this challenge, this paper proposes a dispatch method that incorporates dynamic line rating (DLR) and transformer life loss under extreme high-temperature conditions. First, the conductor temperature-rise mechanism is formulated using the thermal balance theory, upon which a temperature-dependent DLR calculation model is developed. Second, the coupling relationship between transformer hot-spot temperature, load ratio, and ambient temperature is quantified, and an ambient temperature-driven transformer life cost function is formulated using linear damage accumulation theory. Finally, a unit commitment (UC) optimization model is established to minimize unit generation costs, transformer lifetime loss costs, and wind curtailment penalties costs, while satisfying power balance, transmission capacity, and other operational constraints. Simulation results on the IEEE 39-bus system demonstrate that, compared to conventional models, the proposed method improves transmission capacity utilization in high-temperature conditions by 12%, reduces transformer life loss costs by 69%, and lowers total operating costs by 4.9%.
ISSN:2079-9292
DOI:10.3390/electronics14204027
Baliabidea:Advanced Technologies & Aerospace Database