UK-based consultancy Ecofys has carried out a front end engineering and design (FEED) study for the Navitus Bay Wind Park, which is being located off the Dorset and Hampshire coasts.
As part of the study, the company has identified the most cost-efficient electrical infrastructure design for the project, a joint venture between Eneco Wind UK and EDF Energy Renewables.
Ecofys has taken into account three key subsystems to identify the electrical infrastructure that include inter-array cables with reference to the applied voltage level; export cables with reference to the applied voltage level; and offshore high voltage stations (OHVS) with reference to choice of quantity and locations.
The company has worked on various designs to identify the feasible combination for the infrastructure, ensuring cost-efficiency in developing and operating it.
The company has prepared grid designs at voltage levels of 33kV and 66kV for the inter-array cables, while it has considered voltage levels of 150kV, 220kV and 275kV for the export cables.
Ultimately, the study has revealed the impact of the choice of locations and the quantity of OHVS with respect to the infield grid and the export cable design, and finalised an optimal design for the project following assessment of the lifetime costs and non-cost criteria of various designs.
Proposed by Navitus Bay Development, the project is likely to feature between 136 and 218 with an approximate installed capacity of 1,100MW.
Once operational by 2021, the project will generate an estimated 3.3TWh of electricity annually, which is enough to power around 790,000 average UK households and curb around 1.15 million tonnes of carbon dioxide emissions a year.
Image: Ecofys' study identifies optimal electrical infrastructure design for Navitus Bay Wind Park. Photo: courtesy of Ecofys.