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PV Importing Not Decreasing as expected

Aron Wyn Jones

Im an electrical supervisor at a manufacturing plant. We installed a 1MW PV system to our roof, which has been a good success in generating power.

But we noticed through the year, as weather is improving during summer our generation increase, but our imported power from the grid tends to remaim the same. We were expecting the imported power to fall as the generated power increases.

Nothing has changed at the plant. Yes, product tonnage various but not much. Our energy KPI are being affected. 

We have checked our 7 PV inverters metering against our utility class calibrated Fluke 1777 power quality analyser, and all 7 are accurate.

Our factory power set up is as follows. We receive x2 11kV feeds from the grid which is ran around our x3 switchrooms (11kV ring main). Out of the x3 switchroom, we have x7 11kV to 400V transformers, and through one of these LV boards our PV system is connected to.

Is there anything we are missing here? As i said we generating good amounts of electricity, so from Janurary commissioning to August we've generated around 900MW of power.

Parents

  • In terms of diagnosing the cause of the problem, I doubt monthly metering volumes will be much help because they don't provide the granularity necessary to see what's going on. 

    I would start with the half-hourly metered volumes - your boundary/supplier half-hourly metering for both the import and the export across the boundary, combined with whatever hourly, half-hourly, or minute level data is available from your solar system. 

    With those data sets, it should then be possible to put the three data-sets together, dip-check a few days and visualise what is going on during a typical working day, to see where the energy is going.

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  • In terms of diagnosing the cause of the problem, I doubt monthly metering volumes will be much help because they don't provide the granularity necessary to see what's going on. 

    I would start with the half-hourly metered volumes - your boundary/supplier half-hourly metering for both the import and the export across the boundary, combined with whatever hourly, half-hourly, or minute level data is available from your solar system. 

    With those data sets, it should then be possible to put the three data-sets together, dip-check a few days and visualise what is going on during a typical working day, to see where the energy is going.

Children
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