Special Seminar: Summer 2014
Speaker: Dr. Nicolai Gayle Nygaard (DONG Energy, Denmark)
Title: "Wakes in Large Offshore Wind Farms – Model vs. Observations"
Date: Tuesday, August 12, 2014
Time: 3:00 p.m.
Location: Hackerman Hall 320
The next generation of offshore wind farms have capacities of several hundred MW. In addition, offshore wind farms are now constructed in clusters, where neighbouring wind farms impact each other. This is a new regime for the wind energy industry, which may require a new modelling paradigm. Turbines in a large array are known to alter the flow in the atmosphere above the wind farm. It has been proposed that this hampers the entrainment of momentum from the air above the wind farm, restricting the wake recovery. This is called the deep array effect. However, the fundamental question remains, is the deep array effect real? Can the current generation of wake models without explicit corrections for large wind farms accurately account for wake effects on the regional scale of a very large wind farm or a wind farm cluster? As data from offshore wind farms with capacities exceeding 350 MW are becoming available, we can begin to address these issues systematically.
In the presentation I will address these questions based on analysis comparing model results with observational data from several offshore wind farms. Furthermore, I will highlight some of the issues involved when working with wind farm SCADA data and point out some of the research topics of interest to wind farm developers.
Dr. Nygaard is a wind energy analyst at DONG Energy. He works on wake modelling and the application of lidars in wind industry. Before joining DONG Energy, he was associate professor at Aarhus University. He holds a M.Sc. in physics from Aarhus University and a Ph.D. in chemical physics from University of Maryland, College Park.