Reactive capability limitation of synchronous machines

Abstract

Achievable generator reactive capability (GRC) is generally much less than indicated by manufacturers' reactive capability curves, due to constraints imposed by plant auxiliaries and the power system itself. The nature of these constraints is explained and a method for calculating them is provided and verified by field tests on a unit at high and low power system voltage levels. Several recommendations are made to enhance the GRC of the tested unit.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>