Coordinated disturbances haunt grids worldwide. Here’s how researchers solved the mystery.
A German research team has identified the source of mysterious minute-by-minute frequency drops observed on power grids across five continents for over a decade. The disturbances stem from synchronized battery state-of-charge checks performed by uninterruptible power supply (UPS) systems. These automated self-tests, often scheduled at the top of the hour, create coordinated load changes large enough to perturb grid frequency worldwide. Researchers recommend randomizing test schedules to eliminate the synchronized heartbeat and reduce blackout risk.
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- ✓ Coordinated minute-by-minute frequency dips have been observed on power grids across five continents for more than a decade.
- ✓ A research team in Germany identified synchronized UPS battery state-of-charge checks as the cause of the disturbances.
- ✓ The UPS self-tests are often scheduled at the top of the hour, creating simultaneous load changes that perturb grid frequency.
- ✓ Researchers recommend randomizing UPS test schedules to prevent the synchronized heartbeat and reduce potential blackout risk.
What changed
Researchers in Germany have definitively linked the global 60-second grid frequency oscillation to synchronized UPS battery self-test cycles, replacing years of speculation with a confirmed mechanism.
Live updates
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Researchers trace global grid frequency dips to synchronized UPS battery self-tests
A German research team has identified the source of mysterious minute-by-minute frequency drops observed on power grids across five continents for over a decade. The disturbances stem from synchronized battery state-of-charge checks performed by uninterruptible power supply (UPS) systems. These automated self-tests, often scheduled at the top of the hour, create coordinated load changes large enough to perturb grid frequency worldwide. Researchers recommend randomizing test schedules to eliminate the synchronized heartbeat and reduce blackout risk.
Why it matters
Grid operators have long detected a precise 60-second pulse in frequency data but could not pinpoint its origin. The phenomenon affected interconnected systems in Europe, North America, and Asia, complicating stability analysis. Identifying the cause as ubiquitous UPS firmware behavior shifts the focus from generation or transmission faults to distributed demand-side equipment.
What is confirmed
- Coordinated minute-by-minute frequency dips have been observed on power grids across five continents for more than a decade.
- A research team in Germany identified synchronized UPS battery state-of-charge checks as the cause of the disturbances.
- The UPS self-tests are often scheduled at the top of the hour, creating simultaneous load changes that perturb grid frequency.
- Researchers recommend randomizing UPS test schedules to prevent the synchronized heartbeat and reduce potential blackout risk.
What to watch next
- Adoption of randomized self-test scheduling by major UPS manufacturers or firmware updates
- Grid operator bulletins acknowledging the UPS mechanism and issuing mitigation guidance
- Studies quantifying the aggregate load impact of synchronized UPS tests on specific interconnections
confidence 92%Sources used for this update (13)
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