DC-side faults in PV plants
DC-side faults in PV plants
(OP)
Hello,
I am performing an arc flash study of a PV plant with EasyPower and noticed something curious during analysis. If a DC bus is faulted, there is no contribution from the AC-side of the inverters that I have modeled. This wouldn't be true though as far as I can reason, since if the IGBTs are turned on in the inverter, then they can conduct in either direction. Am I interpreting this correctly? In everyone else's experience, should there be some contribution to the DC fault from the AC side?
Tim
I am performing an arc flash study of a PV plant with EasyPower and noticed something curious during analysis. If a DC bus is faulted, there is no contribution from the AC-side of the inverters that I have modeled. This wouldn't be true though as far as I can reason, since if the IGBTs are turned on in the inverter, then they can conduct in either direction. Am I interpreting this correctly? In everyone else's experience, should there be some contribution to the DC fault from the AC side?
Tim






RE: DC-side faults in PV plants
On the other hand, because most solar panels are current type devices, it won't hurt them to be short circuited, so a fast was to remove a DC fault voltage is with a crow-bar circuit.
RE: DC-side faults in PV plants
Do you model the VFD in detail? Or are you using a ready-to-go model? The latter may not show detail down to the single electron.Temporal step size may also be important.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: DC-side faults in PV plants
Thanks again!