4.6 TURBINE MODEL
For a simple non-reheat type turbine, the model is given by a single time constant but reheat turbines have more than one time constant. If a reheat unit has two-stage steam turbines, the dynamic response will be influenced by:
- The entrained steam between the steam inlet valve and first stage of turbine and
- The storage action in the reheater which causes the outlet of the L.P stage to lag behind that of the H.P stage (See Fig. 4.6).
Fig 4.6 Two-stage re-heater unit
The turbine transfer function is characterized by two time constants. For the purpose of analysis, it can be assumed that the turbine in modeled by a single equivalent ...
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