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 Eq′ 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 eq′, which now varies in accordance ...

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