Sungrow Achieves Major Breakthrough in Solar Power Stability
HEFEI, China — September 17, 2026 — Sungrow, a top global provider of PV inverters and energy storage systems, has made headlines by successfully reproducing and controlling wideband oscillation at a 500 MW solar-plus-storage facility in Qinghai, China. This remarkable achievement addresses a significant challenge for renewable energy systems as their use grows around the world.
Wideband oscillation has emerged as a significant concern, especially as renewable energy sources are integrated into electrical grids. These oscillations can lead to serious problems, including disconnections from the grid or complete shutdowns of renewable plants. For example, in 2014, the BorWin1 project in Germany faced severe oscillations that damaged equipment and caused a six-month shutdown, leading to substantial financial losses. Similarly, a 2019 incident at the Hornsea offshore wind farm in the UK resulted in a loss of power affecting nearly one million customers due to oscillation issues.
Despite the urgency of the problem, understanding and controlling these oscillations has been challenging. Efforts to study the phenomenon have primarily remained within theoretical and simulation contexts, with few practical tests in actual power plants.
To tackle this issue, Sungrow partnered with leading industry experts to conduct a ground-breaking field test at their Qinghai site. The test focused on creating conditions that mimic weak grid situations while examining three crucial factors: power output, system short-circuit ratio (SCR), and control settings. Through this work, they successfully demonstrated a controlled reproduction of localized oscillations.
The researchers also tested Sungrow’s PV inverters under various grid conditions to evaluate their capability to suppress oscillations. Utilizing their advanced grid-strength adaptation technology, these inverters were able to assess grid conditions within just 40 milliseconds. They made the necessary adjustments to maintain a stable voltage and frequency almost instantly.
The test confirmed that the grid-forming control strategy used by Sungrow was effective in managing oscillations, capable of operating smoothly across a broad range of system short-circuit ratios, and alleviating sudden spikes in voltage levels.
By achieving this level of control and suppression of wideband oscillation at a real-world facility, Sungrow has taken a critical step in shifting these techniques from academic research into practical application. This progress not only enhances the stability of renewable energy systems—especially under weak grid circumstances—but could also boost the capacity for power distribution, reduce losses in power generation, and minimize grid disconnections caused by oscillations.
Pan Nian’an, Chief Engineer and Chief Expert for Utility PV at Sungrow, emphasized the importance of developing self-healing and grid-supporting technologies for renewable energy to ensure reliability in power supply. Sungrow plans to continue advancing research in grid technologies, with a focus on innovations that include oscillation suppression and improved grid stability. By doing so, they aim to bolster the integration of renewable energy into the grid while paving the way for a secure energy transition and the development of next-generation power systems.
