Mechanical power supplied by turbines can often be considered invariant for the duration of most transient simulation runs. In some cases, where provisions are made for fast-valving, or discrete control in response to acceleration, prime mover effects can be significant even if the phenomena of interest span only for a few seconds. Also, to ensure the accuracy of longer simulation studies, modeling the turbine dynamics may be considered necessary.
Turbines are represented in PSCAD as dynamic transfer functions, and can be interfaced to a machine through interaction with a corresponding governor model (depending on the turbine type). There are several pre-defined turbines available in the PSCAD Master Library. If none of the available turbine models suit your needs, equivalent systems can be constructed by using combinations of the basic control 'building blocks' from the CSMF (Control System Modeling Functions) section of the PSCAD Master Library.
Both hydro and thermal (steam) turbines are available in the PSCAD Master Library. These models support variable time step, and allow for initialization at any time (not necessarily at time = 0.0) through additional control inputs.
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Hydro Turbines |
Description
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Non-Elastic Water Column without Surge Tank |
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Elastic Water Column without Surge Tank |
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Non-Elastic Water Column with Surge Tank |
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Elastic Water Column with Surge Tank |
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Thermal Turbines |
Description
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Generic Turbine Model |
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Generic Turbine Model Including IV Effect |
For further details on background theory for these turbine models, see PSCAD references [1], [2] and [3].