coordinated
converter control, fault ride-through) are
conceptually relevant but need scaling and
simplification
EMC and harmonic
behaviour
Yes (TC 77, 22) HVDC experience EMC and harmonic
emission studies transferable MVDC
. IEC 62895) are
extendable MVDC but need MV-specific
considerations like more compact layouts
Switchgear and fault
current interruption
Partially (TC 17) HVDC switchgear experience (e.g.g.g.62
Standardization for MVDC grids
Table 7-1 IEC MVAC standards extensibility MVDC
Topic Extension feasibility Notes
Power conversion (DC-DC,
AC-DC)
Yes (TC 22, Already addresses converters, drives, and
system integration parts
Switchgear and protection
devices
Partially (TC 17, 95) Most existing standards are AC-focused;
DC-specific arc extinction, breaking capacity,
interruption principle and relay coordination need
new approaches
Insulation coordination,
grounding
Partially (TC 28, 99) Voltage stress and transient behaviour differ
significantly DC
Data models and
communication
(IEC 61850, IEC 61968)
Yes (TC 57) Data models can evolve support MVDC
assets
Short-circuit calculation,
protection selectivity
TC 73, short-circuit behaviour fundamentally
different: needs new models and relay logic
System planning and
operation
No clear home MVDC grid architecture lacks dedicated
coverage
Table 7-2 IEC HVDC standards extensibility MVDC
Topic Extension feasibility Notes
Converters Yes (TC 22, HVDC converter standards can extended to
MVDC with adjustments for scale and topology
Insulation coordination and
testing
Yes (TC 28, 99) Existing insulation and testing methods
(IEC 60071, IEC 60060) are applicable but need
parameter tuning
Cables and accessories Yes (TC 20) HVDC cable standards (e. hybrid DC
breakers) helpful, but MVDC needs faster and
lower energy response characteristics
Control and protection
philosophy
Partially (TC 115) HVDC control methods (e
