A novel index on transmission renewal planning considering transmission loss and voltage quality

With the high economic growth era up 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 been saturated due to low economic growth. Therefore, for electric power facilities planning, it is necessary to form a rational renewal plan with various aspects which does not consider only facility ages. In this paper, we propose a new transmission renewal planning method using System Loss Sensitivity. Here we evaluate the decrease of active power flow loss, and the voltage increase due to the decrease of reactive power flow loss. 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.