Component models

PMUs measure voltages and currents (among othes). By giving systematic names to the measurement channels, it is possible to determine what actual components/elements the currents flow through, and what are the voltages at the terminals of the components/elements. This further allows us to do calculations, e.g., by using the current and voltage to determine the power flow in a line.

This is what the implemented “component models” do. Currently, models for the following components are available:

• Buses

• Lines

• Loads

The models are used as follows:

# Define the line model:
line_model = Line(
    config,
    pmu_data_config,
    units=['L3000-L3245-1', 'L3000-L3245-2'])

# Quantities can now be calculated from PMU data frames
line_model.P_from(pmu_data_frame)
line_model.Q_from(pmu_data_frame)

In a real-time application, it makes sense to define the model (first 5 lines in the example) when the application is initialized. This is where searching for channel names, etc., happens. Then, as the application is running in real-time, it runs the calculations efficiently (as in the last two lines).