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Optimal vegetation maintenance scheduling of overhead electric power distribution systems

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3 Author(s)
Kuntz, P.A. ; Dept. of Electr. Eng., Univ. of Washington, Seattle, WA, USA ; Christie, R.D. ; Venkata, Subrahmanyam S.

Vegetation maintenance involves trimming or removing trees and brush near the overhead conductors to reduce the number of tree-related outages and maintain system reliability. This paper reports a maintenance-scheduling algorithm that determines the optimal location and time for performing vegetation maintenance on overhead distribution feeders. A vegetation failure rate model is developed that quantifies the impact of the maintenance schedule on the reliability of a distribution system. Using this reliability model and a predictive reliability assessment algorithm, the maintenance-scheduling algorithm is formulated as a combinatorial optimization problem that considers different objective functions and constraints. After experimentation with several heuristic search techniques, a hybrid genetic algorithm-hill climbing technique consistently found the highest-quality maintenance schedules. The results from applying the maintenance-scheduling algorithm to a real distribution system are also presented. It is shown that the new maintenance scheduling algorithm can find lower cost and more reliable schedules compared to standard fixed interval schedules.

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Power Delivery, IEEE Transactions on  (Volume:17 ,  Issue: 4 )