Impact on T&D protection systems from low fault levels in high wind conditions in 2030

A scenario called “Gone Green” has been drawn up designed to meet the GB component of environmental targets. Helge reviews the plant mix and its expected rapid changes on an hourly basis in 2030. National Grid is engaged in analysis of a range of technical challenges arising from operation of the system including a few hours in the year when production from 40GW of installed wind capacity is expected to exceed the total electricity demand. The potential impact on T&D protection systems in 2030 is reviewed, arising from the change of source of fault currents away from synchronous generation to wind generation. Wind generation electrical performance is dominated by power electronics and associated controls. At this early stage Helge suggests a deeper analysis is undertaken to ensure that protection systems remain fit for purpose throughout design life time in order to minimise potential need to replace protection systems early. This may affect both Transmission and Distribution. Helge also suggests possible means of avoiding the low fault current challenges.