Gas turbines possess unique frequency response characteristics, as
compared to other conventional (synchronous) generation technologies, which can
significantly influence power system dynamics and stability during disturbances in
the network. Many power systems are seeing increasing penetrations of combined
cycle gas turbines (CCGTs), along with variable renewables, such as wind and solar
generation, so an improved understanding of gas turbine characteristics during
high- and low-frequency events and network faults is required in order to mitigate
potential adverse system impacts. In particular, the impact of ambient conditions on
unit rating, the temperature control system, gas turbine compressor intake, and
associated components such as inlet guide vanes (IGVs) must be accurately modelled,
particularly when operating at high output, in order to accurately assess the
impact of CCGTs on stability issues. Therefore, this chapter aims to provide a
comprehensive guide to developing a CCGT model using the DIgSILENT dynamic
simulation language (DSL), including model initialisation. In addition, modelling of
an open cycle gas turbine (OCGT) will be presented. Finally, a dynamic comparison
of the CCGT and OCGT models will be examined using a demonstration test
system.
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