ITU-T L.1205 PDF

This Recommendation defines the interconnection of the site power installation feeding an up to 400 VDC interface, to site renewable energy or to distributed DC power sources. The aspects covered include:

– general power architectures for:

– connection of a site renewable energy source (PV, wind generator, fuel cells, etc.) to a site power plant and especially to a DC power system, (the site sources being on the buildings or around)

– exchange of power to and from a DC nano or micro grid for use and production outside of the site (this includes dedicated remote powering networks built for telecom/ICT access equipment but also more general purpose DC electric grids)

– conditions required to maintain the specified performance for the up to 400V power system:

– electrical stability

– reliability and maintainability

– proper battery charge and management

– lightning protection coordination

– electromagnetic compatibility (EMC) and transient limits

– specification of proper power sizing (requirements for control-monitoring and power metering)

– assessment of performances (AC grid energy saving, reliability, flexibility, environmental impact, etc.)

The current Recommendation does not cover:

– renewable energy dimensioning

– power injection into the legacy AC utilities which is already covered by many Standards (e.g., IEC Standards),

– some of the smart power management possibilities through exchanges with DC nano or micro grids