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PowerFactory  Supported Features and Limitations
 1 Network Components
 1.1 Nodes
 1.2 Branches
 1.2.1 Switches
 1.2.2 Lines and Other NonTransformer Branches
 1.2.3 Transformers
 1.3 Generators, Loads and Shunts
 1.3.1 Sources and Generators
 1.3.2 Loads and Shunts
 2 Standard Dynamic Models (PSS/E Compatible)
 3 Simulation Events
 4 Power Flow Computation Limitations
 5 Differences in the Implementation of Synchronous Machine Control System Models
 6 Import of subsystems
Network Components
Nodes
 PowerFactory Component  Supported Features  Comments / Limitations 

Terminal ( 


Branches
Switches
 PowerFactory Component  Supported Features  Comments / Limitations 

Switch ( 

Known unsupported features:
 
Breaker/Switch ( 
 Known unsupported features:

Lines and Other NonTransformer Branches
 PowerFactory Component  Supported Features  Comments / Limitations 

Line ( 

 
Common Impedance ( 

Known unsupported features:
 
Series Reactor ( 
 Known unsupported features:
 
Series Capacitor ( 
 Known unsupported features:
 
Series RLCFilter ( 


Transformers
 PowerFactory Component  Supported Features  Comments / Limitations 

3Phase 2WTransformer ( 

Known unsupported features:
 
3Phase 3WTransformer ( 

Known unsupported features:

Generators, Loads and Shunts
Sources and Generators
 PowerFactory Component  Supported Features  Comments / Limitations 

AC Voltage Source ( (one terminal) 

 
Synchronous Machine ( 
 Known unsupported features:
 
Static Generator ( 


Loads and Shunts
 PowerFactory Component  Supported Features  Comments / Limitations 

Shunt/Filter RL, RLC, C ( 

Known unsupported features:
 
General Load ( 

Known unsupported features:

Standard Dynamic Models (PSS/E Compatible)
There are small differences in the implementation of the model in HYPERSIM, with respect to those in PowerFactory. See Comments / Limitations column.
Excitation Systems
Model Name  Supported Versions  Comments / Limitations 

AC7B 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.9. 

AC8B 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.11. 

DC3A 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.21. 

ESAC1A 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.25. 

ESAC2A 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.26. 

ESAC3A 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.27. 

ESDC2A 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.33. 

ESST1A 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.34. 

ESST2A 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.35. 

EXAC1 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.40. 

EXAC2 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.42. 

EXAC3 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.43. 

EXDC2 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.46. 

EXPIC1 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.50. 

EXST1 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.51. 

EXST3 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.54. 

IEEET1 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.55. 

IEEET2 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.56. 

IEEET3 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.57. 

SCRX 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.73. 

SEXS 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 6.74. 

* Errors have been computed by signal comparison function from ScopeView
(i.e., sgncmp
, ref: Advanced  SIGCMP). Simulations have been performed on unit test models where the event was either a setpoint or a load change.
res = sigcmp(HYPERSIM Signal, PowerFactory Signal, Tol)
The error is the tolerance value that allows to obtain a result of zero along the simulation interval.
TurbineGovernors
Model Name  Supported Versions  Comments / Limitations 

DEGOV1 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 7.4. 

HYGOV 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 7.15. 

TGOV1 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 7.40. 

TGOV2 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 7.42. 

WEHGOV 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 7.52. 

GAST 
V2023 / Reference: PSSE 35.2.0 Model Library, sec 7.6 

Simulation Events
Event  Supported Features  Comments / Limitations 

ShortCircuit Event (EvtShc) 
** Please refer to Terminal ( 

Switch Event (EvtSwitch) 
** Please refer to Switch ( 

Power Flow Computation Limitations
UCMs in HYPERSIM lack support for dynamic loadflow. This has an impact on the import of PowerFactory network models containing loads with the Complex Load Type
or Extended Ward Equivalent
voltage sources.
An alternative method for such advanced load flow calculations is suggested. This method involves the following steps:
Step 1: Fill the load flow setpoint data fields in the Load Flow
tab of the UCM block's mask.
The field values will very likely include expressions that refer to other component variables.
For instance, in the example above the expressions for P and Q are the following:
P=50e6*(0.5*(bus3.LF_Voltage/132)^0.9+0.4*(bus3.LF_Voltage/132)^1.7+0.1*(bus3.LF_Voltage/132)^2.1)
Q=20e6*(0.45*(bus3.LF_Voltage/132)^1.0+0.35*(bus3.LF_Voltage/132)^2.5+0.2*(bus3.LF_Voltage/132)^0.5)
Step 2: Open the Parameter Form of the bus to which the component is connected. Go to the Load Flow Results tab. Execute the load flow several times until the Voltage field value converges.
Iteration 0  Iteration 1 
Iteration 2  Iteration 3 
Iteration 4 

Differences in the Implementation of Synchronous Machine Control System Models
Components of the Control Exciters, Control Governors and Control Stabilizers libraries in HYPERSIM are based on their respective implementation from a given version of PSS/E. The behavior of these components has been validated against simulation results in that specific version of PSS/E. Where applicable, HYPERSIM components have also referenced IEEE standards such as the “IEEE Recommended Practice for Excitation System Models for Power System Stability Studies“ (IEEE Std 421.52005).
However, the implementation of a same control component may vary from one version to another of PSS/E, as illustrated with the example below:
It can be noted that the output of the voltage regulator of the model shown in the figure above is limited in the range [ F * VRmin
, F * VRmax
]. It turns out, that the function F has different definitions among different PSS/E versions:
PSS/E 33.4:
F = [1.0 + F1IMF * (ET  1.0)] * (KE + KD + SE)
PSS/E 34.2:
F = [1.0 + F1IMF * (ET  1.0)]
PSS/E 35.1.0:
F = [1.0 + F1IMF * (ET  1.0)] * (KE + KD + SE)
PowerFactory, on the other side, also provides dynamic model blocks that are compliant with PSS/E. It is not entirely clear, to which version of PSS/E the components from its v2022 Standard Dynamic Models library are referring to. But, all the components from its v2023 Standard Dynamic Models library are referring to the PSS/E 35.2.0 Model Library. Most of HYPERSIM’s dynamic model blocks are referring to PSS/E 34.2 Model Library.
Some other typical causes of mismatches in the response of dynamic models are the following:
Different model initialization.
Additional calculated inputs which result in offsets at summation point outputs.
Different implementation of basic blocks such as proportionalintegralderivative (PID) and the exciter saturation characteristic. An example of this last item is shown in the table below, where two mathematical definitions of the saturation characteristic are provided.
Exponential Function  Quadratic Function 
