초록 ▼

An excitation controller sets an output terminal reference voltage of a synchronous machine from a reactive current output from the synchronous machine and a high side reference voltage of a transformer, and controls the field current supplied to the field winding of the synchronous machine in respo

An excitation controller sets an output terminal reference voltage of a synchronous machine from a reactive current output from the synchronous machine and a high side reference voltage of a transformer, and controls the field current supplied to the field winding of the synchronous machine in response to the deviation between the reference voltage and the output terminal voltage. Although a conventional excitation controller can maintain the transmission voltage on the transmission bus at a fixed value, an expensive potential detector is needed for detecting the transmission voltage on the transmission bus, which increases the manufacturing cost of the excitation controller.

대표청구항 ▼

[ What is claimed is:] [1.]1. An excitation controller comprising:a voltage detector for detecting an output terminal voltage of a synchronous machine, the synchronous machine being connected to a low voltage side of a transformer, the transformer having a high voltage side where a high side voltage

[ What is claimed is:] [1.]1. An excitation controller comprising:a voltage detector for detecting an output terminal voltage of a synchronous machine, the synchronous machine being connected to a low voltage side of a transformer, the transformer having a high voltage side where a high side voltage is produced and that is connected to a transmission system including a transmission line;a reactive current detector for detecting a reactive current output from the synchronous machine;a voltage setter for setting an output terminal reference voltage of the synchronous machine from the reactive current detected by the reactive current detector and a high side reference voltage of the transformer; anda controller for controlling an excitation system of the synchronous machine in response to a deviation between the reference voltage set by the voltage setter and the output terminal voltage detected by the voltage detector, wherein the voltage setter sets the output terminal reference voltage of the synchronous machine such that the high side voltage of the transformer matches the high side reference voltage when the reactive current detected by the reactive current detector matches a reference current.