General Electric has filed a complaint, 2:17-CV-5653, on Monday of this week in the US District Court in the Central District of California alleging that Vestas is infringing a patent on zero-voltage ride through (ZVRT). 

GE contends that the Vestas V90-3.0, V100-2.0, V112-3.0, and V117-3.3 wind turbines comprise technology which utilises a converter control system capable of riding through a grid voltage drop down to "approximately zero volts".