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Description
This model is a Woodward diesel generator governor model. The governor model consists of an electric actuator, a hydromechanical actuator and the diesel engine. Its counterpart, the DEGOV1, also includes a Droop control that allows it to run in droop mode. The DEGOV model was developed in line with the governor-turbine architecture given in the references [1-3].
Mask and Parameters
DEGOV parameters
Expanding “Block diagram” displays the block diagram in the parameters window.
Note: The input of the DEGOV block is actually the machine’s speed in pu ω. The block internally computes the speed variation Δω with a reference of 1 pu.
Name | Description | Unit |
T1 | Electric Control Box time constants | s |
T2 | s | |
T3 | s | |
T4 | Actuator time constants | s |
T5 | s | |
T6 | s | |
K | Actuator gain | - |
Tmax | Actuator Maximum limit | pu |
Tmin | Actuator Minimum limit | pu |
TD | Engine time delay | s |
Initial values
Pm0 | Initial mechanical power output | pu |
The initial power output can be set manually, by entering a numerical value. It can also be set automatically based on load flow calculations, by entering a referenced synchronous machine variable. Machine variables can be found in the machine netlist.
For instance, if the name of the synchronous machine on which the governor/turbine is connected is “SM1”, then Pm0 shall be set as =SM1.Peo/SM1.BaseMVA, if a thermal machine or a hydraulic machine is used, and as "=SM1.lfP/1e6/SM1.sBase" if a pu standard or a pu fundamental machine is used, where Peo and IfP are the initial power outputs of the machines, respectively.
The HYPERSIM simulation option “Set Initial Conditions” must be checked for the automatic initialization to work properly.
Inputs, Outputs and Additional Signals Available for Monitoring
Inputs
ω | Machine actual speed | pu |
Outputs
Pm | Mechanical power output | pu |
References
P. Kundur, Power System Stability and Control, New York:McGraw-Hill, 1994.
NEPLAN AG. Turbine-Governor Models, Standard Dynamic Turbine-Governor Systems in NEPLAN Power System Analysis Tool; NEPLAN: CH-8700 Küsnacht (ZH), Switzerland, 2013; p. 91.
PSS®E 34.2.0 Model Library. NY, USA: Siemens Industry, Inc., 2017.