Investment efficiency assessment on the electric grid by group of control
Résumé
The French DSO Enedis spends several hundred million euros every year to maintain and renew its existing network. The investments are made according some policies. One of these policies, called Refurbishment, consists in renovating some segment lines of the overhead medium voltage power network. The choices of the segment lines are made by some experts according mainly to the past outages. To be sure that the choice has been appropriate, we would like to know if the investment is efficient or not. To develop an investment efficiency assessment, we have to compare the number of outages after treatment in a group of refurbished segment lines with a group of un-refurbished segment lines all other things being equal. The method proposed in this paper consist of defining appropriate weights for the un-refurbished segment lines group to make it statistically comparable to the refurbished segment lines group. When we apply the appropriate weights to the unrefurbished segment lines group, we obtain a control group that can be compared to the refurbished segment lines group. By counting the difference of the outages after treatment between the refurbished segment lines group and the control group, we can estimate the performance of the investment. Using the statistical test “Exact Test of Fisher” [2], we can prove that the difference of outages is significant.
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