The calculation of Data driven loadflow is quite similar to the profile loadflow.
It is carried out as follows:
•Choose Calculate | Analyses | Data driven loadflow
•Specify the settings.
Measurement and profile files
The measurement files available can be added. These can include active and reactive power injections, currents, voltages, branch power flows. These are coupled with the MV/LV transformers, the large consumers as well as specified for the measuring devices at the beginning of the feeders with the external measurement file(s) option. If a reference profile file is intended to be used, the profile can be added into the second option i.e. external profile file(s). Data from the reference profile can be used to fill in the missing gaps in measurement data. Also in case measurement for a (transformer-)load is completely missing, synthetic or typical profile can be used to improve the estimation process. More information about an external profile can be found in External profile.
Pre-processor
To make sure that the measurement data which has been added with the external files is complete, the user has an option to fill in the missing gaps with the pre-processor tool. The available pre-processing methods are described in detail at: State Estimation / Data Driven Load Flow. Below the short summary is provided.
Calculation interval
The calculation interval can be manually selected if needed. It has to be equal or greater than the interval used in the measurement/profile files to make sure the data is comprehendible and as accurate as possible.
Missing data
The missing gaps in the measurement profiles can be filled by using the various techniques under this option:
•Same timestamp value from previous week
•Same timestamp value from previous day
•Same value from previous timestamp
•Average value of same timestamps (previous 10 days)
•Reference profile
Cyclus
If the Cyclus box is checked, then a further analysis is done for the cables and transformers in the network based on their temperature properties. This cyclic calculation is based on norms IEC 60853 and IEC 60287 (for the cables) and IEC 60076-7 (for transformers). The graphical representation of the results can be found by clicking on the 'Cyclus' button present in the Details window of each cable and transformer.