ANALYSIS OF THE DUAL-EXCITED SYNCHRONOUS MACHINE WITH SPECIAL REFERENCE TO ITS DYNAMIC STABILITY

Abstract

In the recent past, attention has been directed towards the possibility of using properly controlled dual-excited synchronous machines to overcome the existing stability limitation of the conventional ones. This thesis presents a generalized analysis for the dual excited synchronous machine, in which the two field windings are net necessarily located on the rotor-axes, and may not have equal number of turns or equal inclination angles to the direct-axis o the pole structure. In deriving the general equations, the external connection, is considered in a general form so as to allow for.studying the machine performance when it is connected to an infinite bus through a general transmission system. The small displacement equations are then derived and arranged in a form suitable for investigating the dynamic stability when different excitation control schemes are used. The improved dynamic stability of the dual-excited synchronous generator is demonstrated by studying a simple power system. For this, a digital computer program has been established. The results show that this machine has superior dynamic stability boundaries compared with these of a conventional synchronous machine especially at no load as well as at low power demand. This research has been supported by the National Research Council of Canada Grants No. A-7115 and No. C-0343.