Validated Models for Gas Turbines Based on Thermodynamic Relationships

Many different types of gas turbines (GTs) are currently in use in power systems worldwide. These gas turbines can be broadly classed as single shaft GT (heavy duty GT) or twin shaft GT (aero-derivative). Due to the different construction of the two types of GT, their responses to the same operational disturbances can differ widely. Modern electronic governors offer wide scope for utilizing the GT to provide a contribution to network support in terms of damping provision and post-fault recovery, features that currently are not included in governor control performance specifications. In order to assess such capability, models capable of yielding more detailed information about GT dynamic behavior than those presently available are needed. This paper presents validated GT models developed from first principles based on the underlying physical processes that dictate the dynamic responses of GTs. The models are validated against manufacturer factory test data and differences in the dynamic behavior of the two major types of GTs are explored. In addition, phase compensated governors are implemented to explore the feasibility of employing such devices in a realistic GT operational scenario.