HEFEI, China, Sept. 17, 2026 /PRNewswire/ -- Sungrow, a globally leading PV inverter and energy storage system provider, recently has achieved a world first by controllably reproducing and successfully suppressing wideband oscillation at a real-world 500 MW solar-plus-storage plant in Qinghai, China. The field test marks a major step toward addressing one of the long-standing challenges facing renewable power systems as renewable penetration continues to increase worldwide.

As renewable penetration rises worldwide, wideband oscillation has become a major challenge, with severe cases potentially causing renewable plants to disconnect from the grid or shut down. In 2014, the BorWin1 offshore HVDC project in Germany experienced oscillations at 250–350 Hz, which damaged filter capacitors on the offshore converter platform and led to a shutdown lasting approximately six months, causing substantial economic losses to the local utility. In 2019, the Hornsea offshore wind farm in the UK experienced widespread disconnection due to subsynchronous oscillation, resulting in a loss of approximately 3.2% of the system load and affecting around one million users. Past incidents have demonstrated the significant impact of oscillation-related events.

However, the complex and unpredictable nature of the phenomenon has made it difficult to safely and controllably reproduce oscillations at real-world plants and validate effective suppression methods in the field. As a result, research has largely remained at the theoretical and simulation stage, with limited systematic validation in actual power plant environments.

To bridge this gap, Sungrow and its industry partners conducted a field test at the plant, using Sungrow PV inverters deployed across the site.

Controlled Reproduction of Wideband Oscillation

The test established weak-grid conditions and identified three key contributing factors—power output, system short-circuit ratio (SCR), and control parameters—before successfully achieving controlled reproduction of a localized system oscillation.

Rapid Suppression of Wideband Oscillation

The field test evaluated the oscillation suppression performance of Sungrow's PV inverters under different grid conditions. Leveraging Sungrow's patented grid-strength adaptation technology, the inverters identified grid strength within 40 milliseconds, adjusted their control strategies accordingly, and rapidly stabilized voltage and frequency.

The test also validated the effectiveness of grid-forming control in suppressing wideband oscillation. Sungrow's grid-forming control strategy enables stable operation across a wide SCR range of 1~40 and effectively mitigates transient overvoltage.

By successfully reproducing and suppressing wideband oscillation at a real-world 500MW plant, the field test marks a critical step in moving wideband oscillation suppression from the laboratory into engineering practice, with the potential to improve the stability of renewable energy plants under extremely weak grid conditions, prevent grid disconnections caused by oscillations, unlock greater power export capacity for plants connected to weak grids, and reduce generation losses.

"For renewable energy to become a truly stable and reliable source of power, it is essential to develop autonomous fault self-healing and grid-support capabilities." Pan Nian'an, Chief Engineer and Chief Expert for Utility PV BU at Sungrow, said Sungrow will continue to advance research and development in grid technologies, focusing on key innovations including wideband oscillation suppression, grid-forming control, and multi-energy coordination. These efforts aim to support the stable grid integration and efficient utilization of renewable energy while strengthening the technical foundation for a secure and stable energy transition and next-generation power systems.

View original content to download multimedia:https://www.prnewswire.co.uk/news-releases/sungrow-achieves-world-first-wideband-oscillation-reproduction-and-suppression-at-500-mw-plant-302881815.html

Nach dem nächtlichen Grossbrand an der Ruessenstrasse in Baar im Kanton Zug gehen die Strafuntersuchungsbehörden von vorsätzlicher Brandlegung aus. Mehrere Fahrzeuge waren am späten Abend des 28. September in Flammen aufgegangen und vollständig ausgebrannt. Die Ermittler stufen Brandstiftung als wahrscheinlichste Ursache ein, wie sie am Donnerstag über die Plattform X mitteilten.

Als die Feuerwehr kurz nach 22 Uhr am Einsatzort eintraf, standen bereits mehrere Autos in Vollbrand. Die Flammen hatten zu diesem Zeitpunkt schon auf ein angrenzendes Geschäftsgebäude übergegriffen. Durch einen raschen und koordinierten Löscheinsatz gelang es den Einsatzkräften, das Feuer unter Kontrolle zu bringen und eine weitere Ausbreitung zu verhindern. Trotzdem entstand ein Sachschaden in der Höhe von mehreren hunderttausend Franken.

Bei den Löscharbeiten wurde ein Feuerwehrmann aus Baar leicht verletzt. Er hatte gemeinsam mit seinen Kollegen versucht, sowohl die brennenden Fahrzeuge als auch das betroffene Geschäftsgebäude zu sichern. Die Feuerwehr konnte Schlimmeres verhindern, doch mehrere Fahrzeuge wurden zerstört und Teile des Gebäudes erheblich beschädigt.

Die Kantonspolizei Zug hat in der Zwischenzeit Ermittlungen zur Täterschaft aufgenommen und wendet sich mit einem Zeugenaufruf an die Öffentlichkeit. Personen, die vor, während oder nach dem Brand im Gebiet rund um die Ruessenstrasse verdächtige Beobachtungen gemacht haben, werden gebeten, sich bei der Polizei zu melden. Hinweise nimmt die Zuger Polizei unter der Telefonnummer 041 595 41 41 entgegen.