An AC voltage source (ElmVac) can be controlled in EMT simulations by means of signals gathered from a measurement file (ElmFile) which specifies the time series for the three phase voltages. For that purpose, the ElmVac must be linked to the measurement file by means of a composite model.

In the attached example, the “RMS_to_EMT” model generates the instantaneous phase voltages based on signals y1, y2, and y3 of the ElmFile, which can be either instantaneous or RMS values in kV depending on the value of the “signalSelect” flag.

The angles (in deg) of the phase voltages set as outputs y4, y5 and y6 of the ElmFile can be used to elaborate the instantaneous values of the phase voltages when angleSelect = 1. Also, the frequency (in Hz) set as output y7 of the ElmFile can be used to elaborate the instantaneous values of the phase voltages when freqSelect = 1. When signalSelect = 0 = it is assumed that the instantaneous values of the phase voltages are read form the ElmFile and these values are injected into the ElmVac.

The parameter "sequence" is used to define if the injection is in the positive, negative or zero sequence.

To reproduce example results, download the attached files, import the project into PowerFactory and proceed as follows:

1. Run the time-domain simulations in study cases 01 and 02 to produce the signals to be injected in the ElmVac in study cases 03a and 05, respectively, from an ElmFile that reads the simulation results (ElmRes).
2. Activate the study case 03b and in the “Filename” field of the ElmFile enter the path to the “RMS_Phase_Measurement.txt” file saved in your local drive.
3. Run the time-domain simulations in study cases 03a and 03b in which RMS phase voltages are injected into the ElmVac.
4. Run the time-domain simulation in study case 04 in which instantaneous phase voltages are injected into the ElmVac.

Verify the setup of the “RMS_to_EMT.ElmDsl” model in steps 3 and 4 above.