6 Solid state transformers
SSTs are entirely new class device the
power system.66
Standardization for MVDC grids
MVDC insulation levels specified IEEE Standard
1709 are average about 1. While they represent converter in
their core operation, the services they provide are
much broader, including the ability operate in
both and power systems. Given the
breadth possible applications and services from
SSTs, much more standards work will required.
. Recent
research [75] has proposed selection of
qualification tests derived from some existing
standards meet the requirements MVDC SST
in large-scale solar applications. This
complicates the preparation MVDC standards
that specify particular insulation ratings. The following
technical standards were identified relevant:
§ IEC 60076-3, Dielectric testing for high voltage
transformers
§ IEC 62109-1, Safety inverters for PV
applications
§ IEC 62501, Electrical testing valves for high
voltage direct current
§ IEC 62271-5, High voltage switchgear and
controlgear Part Common specifications
for direct current switchgear and controlgear
This work was focused only SSTs associated
with large-scale solar installations.
As more data the operation MVDC
equipment varying operational environments
become available, will crucial establish
a comprehensive classification system and
standards for MVDC insulation levels that address
the diverse needs MVDC’s various applications.
7.2 times higher than
the terrestrial MVDC levels IEC 62271-5 for the
same rated voltage. The differences insulation
specifications highlighted above can probably be
attributed the harsher environmental conditions
in marine applications, such the presence
of salt the sea air, which necessitates higher
insulation levels ensure safety and reliability.
No existing standards directly cover SST design,
testing, operation interoperability
