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With the high economic growth era until 1990s, the power demand increased sharply year by year. Therefore, the electric power utilities installed many electric power facilities along with the predicted demand. However, in recent years, fewer apparatuses have been installed because electric power demand growth has started saturated due to low economic growth. Then, for smart electric power facilities planning, it is necessary to form a rational renewal planning from various aspects, which does not consider only facility ages. In this paper, we first propose a new smart transmission renewal planning index using active power loss and reactive power loss sensitivities. And then, we propose to evaluate the decrease of active power flow loss, and the voltage improvement due to the decrease of reactive power flow loss in the N-1 contingency, which are achieved by line renewals. Finally we carry out simulations for the IEEJ EAST 10-machine model system and determine the transmission planning priority to confirm the validity of the proposed method.

A transmission renewal planning index considering transmission loss and voltage magnitude in N-1 contingency