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IEESGO
Description
The IEESGO is a steam turbine model improved in 1973 from the TGOV1 model from IEEE. This model represents the turbine-governor droop with lead-lag (K1, T1, T2, T3), the main steam control valve motion and limits (T4, PMAX, PMIN), the reheater control (K2, T5) and the IP-LP power contribution (K3, T6). Two turbine fractions are introduced (K2 and K3) to represent different stages in the steam turbine. The IEESGO model was developed in line with the governor-turbine architecture given in the references [1-3]. Figure 1 shows the architecture of the IEESGO model. Figure 2 shows the symbol of the IEESGO governor-turbine model.
Mask and Parameters
IEESGO Parameters
Each parts of the governor are available to see from when expanding the diagrams.
The model has the following parameters:
Name | Description | Unit | Default value |
---|---|---|---|
K1 | 1/per unit regulation | - | 20 |
T1 | Controller lag | s | 0.15 |
T2 | Controller lead compensation | s | 0 |
T3 | Governor lag | s | 0.13 |
PMAX* | Upper power limit | pu | 0.982 |
PMIN* | Lower power limit | pu | 0 |
T4 | Delay due to steam inlet volumes associated with steam chest and inlet piping | s | 0.22 |
K2 | Fraction | - | 0.747 |
T5 | Reheater delay including hot and cold leads | s | 4.97 |
K3 | Fraction | - | 0.631 |
T6 | Delay due to IP-LP turbine, crossover pipes and LP end hoods | s | 0.2 |
Initial Values
Name | Description | Unit |
Pm0 | Initial mechanical power output | pu |
The initial values parameters can be set manually, by entering a numerical value. They can also be set automatically based on load flow calculations, by entering a referenced synchronous machine variable. For instance, if the name of the synchronous machine on which the governor/turbine is connected is “SM1”, then the values should be inserted as follow (if the machine is defined as PV type):
Name | Unit | Description |
Pm0 | pu | SM1.lfP/1e6/SM1.sBase+3*SM1.Rs*((sqrt(SM1.lfP^2+SM1.lfQ^2)/1e6/SM1.sBase)/sqrt(3)/SM1.lfVolt)^2 |
If the machine is defined as a swing type:
Name | Unit | Description |
Pm0 | pu | BusName.LF_Pbus/SM1.sBase+3*SM1.Rs*((sqrt(SM1.lfP^2+SM1.lfQ^2)/1e6/SM1.sBase)/sqrt(3)/SM1.lfVolt)^2 |
The HYPERSIM simulation option “Set Initial Conditions” must be checked for the automatic initialization to work properly.
Inputs and Outputs and Additional Signal Available for Monitoring
Inputs
Input | Description | Unit |
P0 | External control reference | pu |
w | Machine actual speed | pu |
Outputs
Input | Description | Unit |
Pm | Mechanical power output | pu |
References
[1] P. Kundur, “Power System Stability and Control”, McGraw-Hill 1994
[2] Standard Dynamic Turbine-Governor Systems in NEPLAN Power System Analysis Tool
[3] PSSE Explore 34 Siemens software
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