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The external grid is modelled as a voltage source with an internal impedance. The mechanical equations are equivalent as those for the synchronous machine. The Acceleration Time Constant (in s)…
For being able to consider frequency dependent network impedances you may use the Voltage Source element (ElmVac) or the External Grid element (ElmXnet). On the Harmonics-page, frequency…
There are two ways to simulate the harmonic voltage distortion from the feeding grid: To model the infeed as a voltage source and entering the harmonics on the Harmonics page. To model the infeed as…
When entering the data for an external network you should firstly be aware of the meaning of Minimum and Maximum current calculations.The Data for the external grid comprise: The fault level may be…
An external grid can have different phase impedances modelled by using a line element defined by a tower type. The tower type is configured such that the user can enter the 3x3…
A series reactor can be used to connect buses that operate at different voltage levels. A series reactor is used to model an impedance to connect the different voltage levels (220kV to 230kV). The…
It is recommended to have only more than one slack generators in the following cases: Lump representation of the external network: when you have two connections from your network and…
The short circuit power of the external grid is typically provided by the network operator for the connection point, where the External Grid element represents the network operators grid. The provided…
It is not possible to change the voltage set point of an external grid during a simulation. The work around is to replace the external grid by an AC voltage source (ElmVac) and then use one of the…
The full network model might not be available for the harmonic analysis or the full model has to be reduced for performance reasons. Examples are: Harmonic Analysis for a power plant (e.g. wind farm /…