DIgSILENT

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How is the external grid modelled for RMS simulation?

It 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) represents the…

How do I model the harmonic impedance of the network?

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…

How can I simulate harmonic voltage distortion resulting from the feeding grid?

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…

How to set up a model of HV grid as an external grid for Short-Circuit calculation?

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…

How can I model an external grid with different impedances for each phase?

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…

How can I connect two different voltage levels?

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…

How can I define more than one slack network?

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…

How does the parameter c-factor in the external grid for the complete method impact the results of a short circuit calculation

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…

How can I change the voltage set point of an External Source to simulate a voltage drop?

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…