Data center UPS systems can damp power grid oscillations, study finds

A new paper from Ahmed Alfatlawi and Masoud H. Nazari, accepted for the 58th North American Power Symposium (NAPS 2026), tackles a growing challenge: as hyperscale data centers mushroom, they strain power grids, but they may also help stabilize them. The authors built explicit dynamic models of a data center's heating, ventilation, and air conditioning (HVAC) and uninterruptible power supply (UPS) subsystems, then integrated them into a small-signal stability framework. Using eigenvalue analysis and time-domain simulations on the IEEE 39-bus test system, they found that UPS-based demand response—adjusting how much power the UPS draws or injects—can actively damp inter-area oscillations, the low-frequency swings that threaten grid stability.

Notably, the HVAC subsystem proved incapable of providing effective damping because its thermal response bandwidth is too limited. To maximize the damping ratio of the critical inter-area mode, the team applied a gradient-based optimization algorithm to tune the UPS controller gain. The results demonstrate a practical path for turning data center infrastructure into a grid asset rather than a liability. With data centers projected to consume ever more electricity, this research offers a mechanism to enhance reliability without new hardware—just smarter control of existing UPS systems.