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- GC22C-07: Assessing the reliability implications of dynamic line ratings under climate change for WECC
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NOLA CC
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Megan Jones, University of Michigan Ann Arbor (First Author, Presenting Author)
Michael Craig, University of Michigan
Understanding how climate change impacts our energy system is essential to ensure that it continues to work. This work focuses on the impact of climate change on the transmission system. The amount of energy that can flow along a transmission line without the line being damaged due to overheating is its “rated capacity” and is a function of temperature, wind, and solar radiation. Traditionally, grid operators have used near-worst-case (i.e. high temperature, high solar radiation, low wind) weather conditions when calculating these ratings to ensure reliable operation. However, due to climate change, as temperatures rise, conditions are expected to be worse more often. This raises the concern that there will be times that transmission lines will be “derated,” i.e. able to carry less than their rated capacity, during critical periods of high energy demand. This possibility, and the implications of it for transmission planning and reliability assessment, has yet to be investigated. To assess the implications, a capacity expansion model, which decides where and when to build generation and transmission based on future demand projections, is run with and without considering derating. Preliminary results suggest not considering derating during transmission planning may lead to underbuilt systems.
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