Optimal reactive power compensation using synchronous generators

Abstract

The paper presents a study on synchronous machine that can operate as a generator and a compensator simultaneously. Modifying the field current, the reactive power injected into the supplying network is changed. An automated system is described which injects the maximum reactive power for a given amount of electrical active power, under the following conditions: the stator current is limited to the rated value, the field current is maximum admissible, the grid voltage is limited to a maximum reference and over-excited state of the machine is assured.