23 Daily — According to techcrunch.com, for years, mysterious synchronized tiny frequency drops every 60 seconds have puzzled power grid managers globally. A German research team from Forschungszentrum Jülich, led by Dirk Witthaut, spent years investigating and has finally identified the root cause behind these coordinated grid disturbances.

Unraveling the Mystery of Global Grid Frequency Dips Every Minute

These frequency sags occur simultaneously across countries and continents, affecting the synchronized operation of large power grids. Maintaining grid frequency within strict limits is critical; large oscillations or improper responses to unknown causes risk blackouts or damage to equipment, especially hydropower turbines. The team initially suspected hydropower plants—historically involved in ultra-low frequency oscillations (UFLOs)—but such mechanical resonances are typically intermittent and not stable every 60 seconds as observed.

Battery Storage Systems and UPS Units as the Synchronized Culprit

After deploying over 80 smart power quality meters at the Jülich research campus to monitor parameters including voltage and frequency every three seconds, the team detected identical minute-interval frequency dips at the transformer connected to a battery energy storage system. Further analysis revealed that many fixed batteries—ranging from data center uninterruptible power supplies (UPS) to grid-scale batteries—perform state-of-charge checks every minute. Because these devices are connected to the internet with near-perfect clock synchronization, their simultaneous checks cause subtle but measurable disturbances on power grids worldwide.

Ireland’s Data Center Boom Amplifies the Disturbance

Using data from Irish grid operators, the researchers observed a sharp increase in the magnitude of these minute-by-minute frequency drops from 3 milli-Hertz in 2016 to 12 milli-Hertz in 2021, with peaks surpassing 20 milli-Hertz recently. As data centers consume an increasing share of Ireland’s electricity (18% of load by 2022) with extensive UPS backup systems, this increased synchronous load impacts grid stability. Although Ireland’s 50 Hz system tolerates ±200 milli-Hertz swings, the growing disturbance pushes operational stresses closer to limits.

Editor's take: Addressing synchronized load impacts vital for grid stability worldwide

This study conclusively links the global synchronized tiny frequency drops to simultaneous state-of-charge checks by numerous UPS and battery energy storage systems. The solution—introducing randomized timing to these checks—is straightforward and software-based. However, the widespread and often unpatched nature of IoT devices means similar phenomena may persist. Regulators and power industry stakeholders must develop standards and controls to mitigate such risks amid increasing smart device integration. Entrepreneurs may find opportunities in power quality analytics, firmware security, and intelligent energy management sectors. Practical validation can be achieved through comprehensive power monitoring tools to confirm desynchronization effectiveness.