modelFourthOrderPlant

Information

1. Purpose of model

This model is based on the simplified representation of a power station unit found in the norm VDI/VDE 3508.

The model takes the set value of the electric power output (P_Target) and translates it to a change into a target thermal input. Meanwhile, the turbine valve aperture remains completely opened. Thus, the model is in natural sliding-pressure operation mode.

2. Level of detail, physical effects considered, and physical insight

The model is based on typical time responses of the power plant components. No phyisical modeling has been conducted.

3. Limits of validity

- This plant model is "always on" meaning that it reacts to power setpoint without delay even if current output is zero

- Control power provision is not implemented (dynamics are then different)

4. Interfaces

P_Target: receives the target value of the electric power in W

epp: type of electrical power port can be chosen

5. Nomenclature

(no elements)

6. Governing Equations

(no equations)

7. Remarks for Usage

The values of Tu, Tg, Ts can be found in the norm. The following table summarizes these values:

8. Validation

According to [1] Chapter 7, "in the operating mode "steam generator in control"... the actual output follows the setpoint after the unit delay, which results from the delay within the controlled power station (Fig. 22a).

9. References

[1] VDI/VDE3508

Pitscheider, 2007

10. Version History

Model created by Ricardo Peniche

Model generalized for different electrical power ports by Jan-Peter Heckel (jan.heckel@tuhh.de) in July 2018

Parameters

Connectors

Components