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

Abstract

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. ΔbΔg J J J ΔQL ΔPL Sy 1 SV LV

Economic power flow adjustment technique using series capacitor and generator output adjustment for generation configuration change

“…LINE FLOW SENSITIVITY NICF [4] In this section, we describe the line flow sensitivity NICF used to calculate the amounts of active power flow change when series capacitors are installed in the system.…”

“…Series capacitors may increase amounts of power flow owing to changes in transmission line reactance. The active power flow changes produced by the reactance changes can be calculated by using a line flow sensitivity NICF (Network Impedance Contribution Factor) [4]. Thus, we propose the concept of mitigation flow sensitivity (MFS), which is the amount of change that occurs when mitigating heavy power flows.…”