LATTC Student
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I am still baffled how this part works.
One simple explanation stated that PV goes to the loads first because electricity takes the least resistive path (vs higher path thru transformer and grid). Another one mentioned that the PV inverter monitors the incoming utility line voltage, syncs to that voltage to maintain grid stability, and increases it's own output voltage that that above the utility voltage thus forcing the power to the local loads first. A third idea mentions the PV inverter is connected to the grid through a transformer. This offers an impedance. Do microinverters have transformers in them?
There seem to be conflicting theories. or maybe just my lack of understanding the tie-in
I do get the concept why the surplus goes back to the grid as the inverter is just a current source, they don't provide voltage and frequency reference by themselves. Instead they measure the (utility) voltage and freq, synchronize with it, and delivery the power output in synch with utility
One simple explanation stated that PV goes to the loads first because electricity takes the least resistive path (vs higher path thru transformer and grid). Another one mentioned that the PV inverter monitors the incoming utility line voltage, syncs to that voltage to maintain grid stability, and increases it's own output voltage that that above the utility voltage thus forcing the power to the local loads first. A third idea mentions the PV inverter is connected to the grid through a transformer. This offers an impedance. Do microinverters have transformers in them?
There seem to be conflicting theories. or maybe just my lack of understanding the tie-in
I do get the concept why the surplus goes back to the grid as the inverter is just a current source, they don't provide voltage and frequency reference by themselves. Instead they measure the (utility) voltage and freq, synchronize with it, and delivery the power output in synch with utility
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