Abstract
Loss of diversity among loads may cause cold load pickup problems after an extended outage in distribution systems. Thermostatically-controlled devices such as air-conditioners, heaters, heat pumps, water heaters etc. become the largest portion of load during restoration. In this paper, an analytical approach for restoration of distribution systems during cold load pickup is presented. A delayed exponential model is used to represent the load during cold load pickup. A thermodynamic model of a transformer is used to determine the loading limits for this type of load. Whenever loading limits are reached, sections are restored step-by-step. In step-by-step restoration, the sequence of sections restored plays an important role in total restoration time. An optimal restoration sequence of different sections of the distribution system is determined for minimum total restoration time as well as minimum customer interruption duration.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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