Small resistance earthing protection computation and engineering verification for renewable energy generation dominated power system

Transient characteristics of power system has developed significantly because of the increasing share of renewable energy generations (REGs). In order to cope with these inevitable impacts from large scale REGs. This paper presents a practical small resistance earthing protection computation for REGs relay protection configuration scheme under extreme fault conditions. First, relay setting calculation is analyzed to identify its key characteristics in renewable energy generation dominated power system. Second, we propose an improvement small resistance earthing protection computation strategy based on theoretical analysis above. Considering the difficulties in project implementation, the detailed calculation process is given with practical engineering example and operation data verify the proposed method.