Modelling of Turbine Generator

Abstract

In this chapter, the detailed mathematical models of a turbine generator (T-G) unit are presented in a form that can be directly utilized for small signal analysis and system simulation. The synchronous machine is represented in detail with three phase stator windings, the field winding and amortisseur (damper) circuits. The electrical damper action of a solid rotor turbo-generator is normally modelled by three equivalent damper circuits — two on the quadrature axis and one on the direct axis. Including the field winding, there are four rotor electrical circuits and the detailed model of a synchronous machine is designated as (2.2) where the first digit refers to the numbers of windings on the d-axis and the second digit refers to the number of windings on the q-axis [IEEE(1986)]. The most detailed model discussed in the literature is (3.3) with five damper windings and is also known as Jackson and Winchester (1969) model. While there is strictly no restriction on the number of equivalent damper windings that can be considered to model the eddy current effects in a solid rotor machine, the availability of machine data (measured parameters) has practically restricted the most detailed model to (2.2) with three damper windings.