Following from smaller-scale investigations of grid-forming converter control applied to wind turbines in 2017-8, this paper describes a much larger trial involving an entire wind park, owned and operated by Scottish Power Renewables. To our knowledge this is the first UK converter-connected wind park to operate in grid-forming mode, and the largest in the world to date. The 23-turbine, 69 MW park ran in grid-forming mode for approximately 6 weeks, exploring inertia contributions of between H = 0.2 s and H = 8 s. A large amount of data was gathered at the turbine and park level, recording responses both to deliberately-induced scenarios, and also to grid events. A number of unscheduled frequency disturbances occurred due to interconnector, CCGT and other trips, to which un-curtailed turbines were able to actively respond. While a significant amount of incremental improvement (software, hardware and energy storage) is still required to deal with the most extreme events which could occur, the turbines are able to provide stable and appropriate response at relatively high inertia levels to the frequency events commonly occurring today.
A. Roscoe, P. Brogan, D. Elliott, T. Knueppel, I. Gutierrez, J-C. Perez Campion, R. Da Silva, 18th Wind Integration Workshop, Dublin, Ireland, October 16 - 18, 2019
KEYWORDS: Grid Forming, Virtual Synchronous Machine, Wind Turbine, Power System Stability