Got an odd request as we delve into advanced controls for development of bi-directional EV chargers.For instance, the newly-updated UL 3141 allows for qualification of certain inverter-based DERs to control currents in remote locations, like branch feeder circuits that might be overloaded by excess solar production. We're trying to determine there's if standard or industry spec for frequency control of PV inverters. This would be apart from the normal qualification to IEEE 1547.1, section that mandates how a grid-interactive inverter will perform with a scheduled frequency-watt export profile. I've been doing this for a while, and have not heard of one, so I thought I'd ask. Colorado Brian
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