.TransiEnt.Producer.Electrical.Conventional.Components.FourthOrderPlant .TransiEnt.Producer.Electrical.Conventional.Components.FourthOrderPlantThis 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.
The model is based on typical time responses of the power plant components. No phyisical modeling has been conducted.
- 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)
P_Target: receives the target value of the electric power in W
epp: type of electrical power port can be chosen
(no elements)
(no equations)
The values of Tu, Tg, Ts can be found in the norm. The following table summarizes these values:
|
Once-through steam generator |
|
Oil and gas |
Tu=5...10s Tg=60s Ts=130...250s |
Tu=5...10s Tg=60...150s Ts=40...120s |
Hard coal with liquid slag removal |
Tu=120s Tg=200s Ts=130...250s |
Tu=50...200s Tg=200s Ts=60...100s |
Hard coal with dry slag removal |
Tu=20...60s Tg=150s Ts=130...250s |
Tu=20...60s Tg=150...250s Ts=60...140s |
Brown coal |
Tu=30...60s Tg=250s Ts=130...250s |
Tu=30...60s Tg=250s Ts=60...140s |
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).
[1] VDI/VDE3508
Pitscheider, 2007
Model created by Ricardo Peniche
Model generalized for different electrical power ports by Jan-Peter Heckel (jan.heckel@tuhh.de) in July 2018