Sungrow Stabilizes Solar Grid Against Wideband Oscillation

Wideband oscillation represents a persistent threat to global energy infrastructure. Previous failures, such as the 2014 incident at Germany’s BorWin1 offshore project and the 2019 Hornsea wind farm disconnection in the UK, highlighted the vulnerability of grids to these unpredictable surges. Until now, validating suppression methods in live environments remained elusive due to the complexity of recreating these conditions safely.

During the Qinghai trial, Sungrow engineers established weak-grid conditions by manipulating power output, short-circuit ratios, and control parameters. Once the oscillation was triggered, the plant’s PV inverters utilized proprietary grid-strength adaptation technology to stabilize voltage and frequency within 40 milliseconds. The test further confirmed that grid-forming control strategies allow for stable operation across a wide range of short-circuit ratios, effectively mitigating transient overvoltage.

Pan Nian'an, Chief Engineer for Utility PV at Sungrow, noted that developing autonomous fault self-healing is essential for reliable renewable power. By proving these capabilities at a utility-scale plant, the company aims to unlock higher power export capacities and prevent grid losses, bolstering the technical framework for future power systems.