DC conductors interference on PV system
DC conductors interference on PV system
(OP)
Rooftop PV system approximate size 2MW. Weather station had a lot of signal errors which were blamed on the DC cabling causing interference. Grounding was correct. Cable was installed in PVC, unshielded, and run with 120V power cable approximate distance 150 feet. Problem was solved by installing filters at the weather stations.
Any IEEE papers on distance to DC circuits causing interference? Would like to rule this out as a cause.
Any IEEE papers on distance to DC circuits causing interference? Would like to rule this out as a cause.





RE: DC conductors interference on PV system
I would suspect the inverters used to convert the solar cell dc output to ac a more likely source of interference. The dc conductors could be acting as a nice antenna system for radiation of RF noise originating from the inverters.
RE: DC conductors interference on PV system
RE: DC conductors interference on PV system
Might be common mode noise on the DC wires.
Might be some noise on the AC power line.
The "DC circuits causing interference" is almost certainly a red herring.
RE: DC conductors interference on PV system
A 2MW system has some serious DC current to handle at 120V (16,666A) and hopefully its not all down one cable! If it's distributed to more than one inverter then there are filters out there specially made for the purpose which can handle up to 2500A each.
RE: DC conductors interference on PV system
RE: DC conductors interference on PV system
RE: DC conductors interference on PV system
RE: DC conductors interference on PV system
RE: DC conductors interference on PV system
It should be solved as the radiated emissions propagation away from the cable are not likely to be permitted by spectrum authorities. Use a good quality AM or SW radio to confirm the *relative* magnitude.