Impact of high-speed railway loads on a longitudinal power system

The impact of the upcoming high-speed railway loads on the characteristics of the Taiwan Power System (Taipower) is investigated. A newly developed three-phase Newton optimal power flow method is adopted as an analytical tool. The voltage unbalance ratio, under-load-tap-changer adjustment, generator voltages, voltages of highspeed railway stations, and the static voltage stability problem are examined. It is found that the Taipower system still has good characteristics when single-phase high-speed loads are imposed to the system.