FEATURE SPONSOR
HIGH VOLTAGE CABLES COMPARISONS
A detailed comparison of 36 kV AC (operating at 33 kV) radial and ring inter- array systems with 52 kV AC (operating at 48 kV) and 72.5 kV AC (operating at 66 kV) radial and ring inter-array systems was undertaken. This involved an analysis of all key technical components of the system, i.e. cables, switchgear, transformers and offshore substations and optimising and comparing the inter-array designs.
COST-BENEFIT ANALYSIS A detailed cost - benefit analysis was carried out in order to compare the systems.
This included CAPEX, operation and maintenance, cost of system losses and cost of losses due to cable failure for an assumed wind farm lifetime of 25 years.
A further qualitative comparison was performed to identify other risks and benefits, including supply chain, health and safety and operation and maintenance considerations.
ROUTE TO COMMERCIALISATION Finally, the optimal higher voltage system was identified and a roadmap was developed to identify the route to commercialisation. It was found that moving to either 48 kV or 66 kV demonstrated a material improvement in the full life costs compared with 33 kV, but that the improvement for 66 kV was the highest.
PAST WORK
Previous work has examined the potential for higher voltages (48 kV or 66 kV) to be used to connect wind farms without an offshore substation but this is the first time that a full analysis has been carried out for the use of higher voltage inter- array systems for wind farms that are far offshore and still incorporate a high voltage AC (HVAC) or high voltage DC (HVDC) transmission systems.
ED’S NOTE
This is an abridged version of the full article which can read online through the QR Code/link below.
Carbon Trust Click to view more info Atkins Global
www.windenergynetwork.co.uk
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