Grid stability and offshore wind farms
The natural instability of wind as an energy resource is often pointed out as a weakness when it comes to supplying Europe with energy from wind farms. While the focus is often on the availability of a back-up solution when the output from the wind farm is low, the fluctuation in output is also very important when it comes to the operation and the stability of the power systems themselves.
Hongzhi Liu is a NORCOWE PhD student from Aalborg University working on grid integration of offshore wind farms. At NORCOWE’s Work Package meeting in May he presented his work on voltage and frequency stability enhancement for power systems integrated with large-scale offshore wind farms through VSC-HVDC (voltage source converter based high voltage DC) link. He is planning to defend his thesis this summer, but the last four months have been a break from his usual PhD work as he has been working on practical cases at Statoil in Bergen, Norway.
At Statoil he has been working for Dr. Wei He, who has spent 22 years in Europe working within wind energy. Wei is leading several EU wind energy projects at Statoil, including NORSEWInD, Deepwind, Marina platform, EERA-DTOC and Mermaid. Hongzhi has been contributing to the EU-Marina project, where he has done a stability analysis regarding electrification of oil and gas platforms using offshore wind farm.
In addition to contributing to the final report in the project, Hongzhi has also been helping with the supervision of bachelor students from the University College of Bergen. The students have been pursuing a degree within energy technology, and been involved in the EU-Mermaid project at Statoil as part of their bachelor. The time in Norway has been busy for Hongzhi, and Wei He says she has been very happy with the collaboration. Hongzhi is now back in Denmark where he is finishing his thesis under the supervision of Professor Zhe Chen at the department of Energy Technology.
Wei will give a talk about the Offshore Wind Farm Integration with Fish Farming at NORCOWE’s summer school this year. She wants to encourage the summer students to be creative by integrating offshore wind with other industries.