EXCITATION CONTROLLER AND EXCITATION CONTROL METHOD FOR STABILIZING VOLTAGE IN ELECTRIC POWER SYSTEM

摘要

An excitation controller comprises a reactive current detector for detecting a reactive current output from a synchronous machine connected, by way of a tap-changer-equipped transformer equipped with a tap changer for changing taps under load conditions, to a transmission system, a tap controller for setting a tap ratio of the tap-changer-equipped transformer according to an output terminal voltage of the synchronous machine, and a voltage setter for setting a synchronous machine's-side reference voltage of the tap-changer-equipped transformer on the basis of a transmission system's-side reference voltage of the tap-changer-equipped transformer, the tap ratio set by the tap controller, and the reactive current detected by the reactive current detector. The excitation controller further includes a control unit for controlling an excitation system for exciting the synchronous machine according to the reference voltage set by the voltage setter.