Excitation controller and excitation control method for stabilizing voltage in electric power system

摘要

An excitation controller sets an output terminal reference voltage (V_Gref) of a synchronous machine (21) from a reactive current (I_Q) output from the synchronous machine (21) and a high side reference voltage (V_Href) of a transformer (22), and controls the field current to be supplied to the field winding (32) of the synchronous machine (21) in response to the deviation between the reference voltage (V_Gref) and the output terminal voltage (V_G). This makes it possible to solve a problem of a conventional excitation controller in that although it can maintain the transmission voltage (V_H) on the transmission bus (5) at a fixed value, an expensive PD (10) is needed for detecting the transmission voltage (V_H) on the transmission bus (5), which increases the manufacturing cost of the excitation controller.