Innovations

Map of the North Sea showing power and H2 connections.

132kV collection grids

Design of 132 kV collection grids for decreased harmonic interactions between turbines
A transition towards higher inter-array voltage level will be necessary to reduce the total number of cables needed and losses related to power transfer at lower voltages, as windfarms and individual turbines grow in power output. There are several technical challenges related to this transition – power system stability and power quality among the most important. NorthWind research has shown that a higher voltage level indeed decreases the system resonance frequency, which can potentially lead to more harmonic problems, e.g. resonance interactions with wind turbines and resulting stability issues or increased harmonic emissions and increased costs for filtering. Work is ongoing to improve the harmonic representation of wind turbine models to be able to investigate these phenomena in detail.