Re-optimizing array cable systems in offshore wind farms using 66 kV voltage

Abstract

As offshore wind energy production is taking part of overall strategy in different countries´ energy mixes, significant cost reductions are needed. One of the key improvements is stepping up inner field voltage from 33 kV to 66 kV. This work presents an inter-array power losses analysis taking into account transition to 66 kV cables instead of usual well known 33 kV solution. This paper covers and compares classical collector system voltage at 33 kV with the new 66 kV voltage level besides new optimization of collector system. Losses distribution is calculated according to IEC 60287 international standard.