1 Scope
This part of IEC 63401, which is a technical report, mainly focuses on the fault behaviour of IBRs and performances
of the existing relay protection in grids with large-scale integration of IBRs.
This document mainly includes:
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• The IBR fault current requirements in present grid codes, including the requirements
of active and reactive currents in positive- and negative-sequence systems during
symmetrical and unsymmetrical faults.
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• Fault current behaviour of IBRs, including the current components in transient and
fundamental frequency in different IBR topology and control schemes.
Adaptability of existing relay protection with the large-scale integration of IBRs,
including the performances of distance protection, phase selector, directional relay
and over-current protection.