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Attached you find an example with 3 unsymmetrical voltage sources. It is required to use 3 symmetrical voltage sources and to connect them to the load busbar using 3 single-conductor cables (phase A…
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…
For load flow calculation, static analysis, the three phase voltages can only be altered by specifying the amplitude and the phase lag in the positive, negative and zero sequence system of the voltage…
Refer to the ]attached example for a measured voltage at a bus bar. The inputs of the voltage source are named U_A, U_B, U_C, as you can see in the composite model. These inputs represent the…
The attached example project shows three different possibilities to implement automatic voltage regulators (AVR), installed along a line. The most left arrangement uses an auto transformer, where the…
Assuming a harmonic voltage measurement is present and needs to be converted into current injections, the following steps need to be taken:1. Convert the measurement data from phase voltage…
The AC voltage source can be controlled in RMS simulation by applying different input values to signal sets (u0,f0) or (U0,F0Hz). The first set controls the per unit quantities, the second absolute…
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 AC voltage source can be controlled in EMT simulations based on a measurement file (ElmFile) of the three phases A, B and C. For that purpose, a the voltage source (ElmVac) is linked to the…