PD IEC TR 63401-4:2022 - Page 2

Dynamic characteristics of inverter-based resources in bulk power systems. Behaviour of inverter-based resources in response to bulk grid faults | Status: Current

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:

• • 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.
• • 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.