Analysis of Circuit Parameters for a Salient-Pole Synchronous Machine with Damper Circuits Considering Cross-Magnetization

Abstract

In order to get better design of synchronous machines, it is important to have accurately known machine constants and to understand the relationship between iron core dimensions and flux distributions. This paper presents new definitions of leakage inductances and a calculation method for all the self-, mutual and leakage inductances and resistances of saturated salient-pole machines with damper circuits. The leakage inductances are divided into self-leakage, gap leakage and winding-differential leakage inductances. The method is applied to a large generator. The relationship between the machine dimensions, saturation and the constants is discussed. The cross-magnetizing inductances, except for d-axis damper circuits, are found to be relatively large. Resistances between the d-and q-axis damper circuits have non-zero values under the rated load condition.