Analysis of Synchronous Machines, 2nd Edition

Chapter 7

Excitation Systems and Dynamic Stability

7.1    Introduction

In the previous chapter stability was investigated based on the concept of constant voltage behind transient reactance E_q′ corresponding to an assumption of constant field flux linkages during the transient. Such machines are said to have a non-continuously acting regulator since the control of the field is then a manual procedure introduced by manual adjustment of a rheostat in the field circuit. In most cases in modern equipment, however, the machine is equipped with a terminal voltage regulator (in the case of a generator) or a power factor regulator (in the case of a motor). In effect, the voltage behind transient reactance is written as e_q′, which now varies in accordance ...