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Volt-VAR and Volt-Watt functionality in photovoltaic (PV) smart invertersprovide mechanisms to ensure system voltage magnitudes and power factors remainwithin acceptable limits. However, these control functions can become unstable,introducing oscillations in system voltages when not appropriately configuredor maliciously altered during a cyberattack. In the event that Volt-VAR andVolt-Watt control functions in a portion of PV smart inverters in adistribution grid are unstable, the proposed adaptation scheme utilizes theremaining and stably-behaving PV smart inverters and other Distributed EnergyResources to mitigate the effect of the instability. The adaptation mechanismis entirely decentralized, model-free, communication-free, and requiresvirtually no external configuration. We provide a derivation of the adaptivecontrol approach and validate the algorithm in experiments on the IEEE 37 and8500 node test feeders.

Adaptive Control of Distributed Energy Resources for Distribution Grid Voltage Stability