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CfSOtago / GREENGridData

Code to process, document data and analyse data from the Renewable Energy and the Smart Grid (GREEN Grid) project.
https://cfsotago.github.io/GREENGridData/
GNU General Public License v3.0
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grid spy: there are some periods where total load was negative despite no PV or other onsite generation #6

Closed dataknut closed 6 years ago

dataknut commented 6 years ago

This was noticed with hot water as -1kw for a few days instead of what was usually +2kw. We consider this was probably a gridspy error due to the current clamp being set to a different phase temporarily. It can be rectified it by multiplying any negative values by -2. (h/t Jefferson)

Note that this correction has not been implemented in the data. The user should deal with this as they see fit.

dataknut commented 6 years ago

It is also visible in Hot Water (c 35% of observations, multiple houses), Lighting (c 3% of observations, mostly in 1 house) and Heat Pump (c 3%, mostly in 1 house) circuits - and thus probably elsewhere

dataknut commented 6 years ago

Update: new negative power & outlier analysis has been conducted - see https://cfsotago.github.io/GREENGridData/gridSpy1mOutliersReport_v1.0.html. It makes recommendations as to what to do. Simply multiplying by -2 may not be the right action in all cases!