Dynamic line rating protection for wind farm connections

This paper describes how dynamic line rating(DLR) is applied for load management and protection of a 132 kV double-circuit line between Skegness and Boston (North East of England) thereby enabling a larger penetration of wind generation. The rating of the line is calculated dynamically from local weather measurements to co-ordinate allowed generation automatically. As a back-up system, in case for some reason the wind farm power output is not reduced on command by the control system, a relay is available to initiate tripping of the wind generators. The paper also includes an analysis of the field data gathered from site which is used to verify the accuracy of the relay algorithm.