The control system uses lasers to monitor the incoming wind field in front of a turbine rotor, facilitating load reductions on components including blades and towers, the certification body said.
It is also capable of reducing rotor speed fluctuation by up to 20%, thereby improving operational stability and increasing turbines’ annual energy production, DNV GL added.
The system can enable fatigue load reductions of up to 20% on towers and up to 7% on blades, including in selected extreme load cases, the certification body's technical director for Asia Pacific, Giovanni Nappi, told Windpower Monthly.
Goldwind started experimenting with lidar-assisted control systems in 2012 and developed it ahead of testing, before becoming the first OEM to receive DNV GL’s component certification for the technology.
DNV GL analysed and assessed the potential of using lasers in turbine control systems for more than ten years.
However, despite many industry players having extensively tested the technology, there is limited field experience with it, the certification body said.
It is also not well covered by existing standards and technical regulations, DNV GL added.
Therefore, to bridge normative guilds and boost confidence in the technology’s feasibility, DNV GL applied its component certification in conjunction with its qualification procedure for new technology, it explained.