Modeling of dynamic clamping system

[TGR]

I would like to model a PV system with dynamic clamping (i.e. no electricity reinjected into the grid). The building’s consumption data has been uploaded in the “self-consumption” section. In the “energy management” sections, the grid limitation has been set to 1 kW with the option “limit at the injection point” (since setting the limit to 0 kW did not trigger any clamping).

 

In the loss diagram, the active energy injected into the grid is correctly shown as 0 MWh. However, the apparent energy injected is not equal to zero.

How can this be explained?

Thank you in advance.

 

 

[André Mermoud]

This is quite normal as you have defined a grid limitation of 1 kW (for a system of 200 kWp, 180 kWac). You can notice that the apparent value is 79 kVah, to be compared to  a global delivery to the user  of 224 MWh, i.e. 0.04%.

Please note that you have the opportunity of completely forbid the injection to the grid when you define the self-consumption: