{"@context":"https://schema.org","@type":"QAPage","mainEntity":{"@type":"Question","name":"State Estimation Setup","text":"Hi! I would like tips and help with my setup for a state estimation.
\nI have a low voltage network with one transformer, using the \"inner side\" of the transformer components. I have reduced the components to just include the clients node, busbars, joints, and different cable types. The client nodes are also the points where real life measurements are being made (real life sensors). These measure the voltage which usually is around 230-240V. They also measure active and reactive power.
\nIf it makes a difference, the graph can be seen in \"graph.png\".
\nRight now, I'm building the PowerGridModel object with these components:
\ninput_data[ComponentType.node] = nodes\ninput_data[ComponentType.line] = lines\ninput_data[ComponentType.source] = source\ninput_data[ComponentType.sym_voltage_sensor] = sym_voltage_sensor\ninput_data[ComponentType.sym_power_sensor] = sym_power_sensor\n
\nThe source, voltage sensor, and power sensor components are pretty much the same as the documentation. Should I consider adding loads? If so, how many? On which nodes? What values should they have?
\nI build the object and run the state estimation the same way as the documentation.
\nIf my results could be useful, the most typical values can be seen in results.txt
\nEither my setup is wrong and I need to reconsider something from it. Or the constants I'm using are not accurate.
\nI'll also upload a file with the constants I'm using and their values
\n![\"graph\"](\"https://private-user-images.githubusercontent.com/223266227/538025816-b823e06f-881d-4fca-a209-aee33d206ea6.png?jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NzEwNDAwMTAsIm5iZiI6MTc3MTAzOTcxMCwicGF0aCI6Ii8yMjMyNjYyMjcvNTM4MDI1ODE2LWI4MjNlMDZmLTg4MWQtNGZjYS1hMjA5LWFlZTMzZDIwNmVhNi5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjYwMjE0JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI2MDIxNFQwMzI4MzBaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT01MjUzNDY3YmRhMjk3Y2M5YWY4ZjYyYmY5NmRkMDUzZDYxNTE0OTE0MzFhNDg2MGU1Zjk2NDhjNmRhMzU4ZDdhJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.00YKX8m0IwPq7aEmPAwwXwCaRTyQDKXXZWibukMYa5Y\")
\n\n","upvoteCount":1,"answerCount":3,"acceptedAnswer":{"@type":"Answer","text":"Hi @cavassiGE,
\nThank you for your questions. Here is my attempt to answer them:
\n\nShould I consider adding loads? If so, how many? On which nodes? What values should they have?
\n
\nYes, you should add a load (resp. generator) at every location where you expect an energy consumer (resp. producer) - i.e., the same locations in which you would have a load if you were to run a power flow calculation. In your case, if my assumption is correct, that that would be at the red nodes.
\nHowever, you do not need to assign p_specified and q_specified, as the power consumption will be calculated from the sensor measurements. The reason you need to specify the loads is so that the Power Grid Model knows where consumption is happening. Without loads, the model thinks there is no consumption happening, so all estimated power flows are zero.
\nThe rest of your setup seems to be OK.
\nI hope this helps. Please let us know how it goes!
","upvoteCount":2,"url":"https://github.com/orgs/PowerGridModel/discussions/79#discussioncomment-15549469"}}}