Getting total losses from power flow

[leovsch]

This continues the discussion started here.

So, after some tweaking of the parameters, the powerflow seems to converge. I have a question regarding the output that I get. How do I get the total losses (active and reactive) of the circuit that I modelled?

Here is my input data:
input_data.json

And here is my output data:
out_result.json

[mgovers]

Hi @leovsch,

Sorry for my late reply. We've had some other priorities we needed to address first.

The easiest way is to sum over all losses per component that can handle loss (branches + shunts (the zero-sequence component)):

• branches:
  • the active power losses are given by branch.p_to + branch.p_from
  • the reactive power losses are given by branch.q_to + branch.q_from
• shunts (in case of shunts that model a grounding transformer): you can directly use either p (active power loss) or q (reactive power loss)
• three-winding transformers:
  • active power losses are given by branch3.p_1 + branch3.p_2 + branch3.p_3
  • reactive power losses are given by branch3.q_1 + branch3.q_2 + branch3.q_3

Important side notes:

• Production at the customer side makes it impossible to do the naive approach of summing the sources and comparing to the loads
• Reactive power and susceptance make it impossible to directly sum over generating appliances and compare them to the sum of all consuming appliances (minus shunts) if you want to be precise.