Grid interconnection of distributed generation: The Spanish normative

Existing distribution networks have not been designed to accept extensive DG. The actual paradigm may change in the near future impelled by a word wide increasing of DG penetration in distribution grids. This paper presents the status and content of DG Spanish legislative documents. Fundamental considerations are first discussed, exclusively regarding the grid-interconnection requirement. This paper also analyses the relationship between that guidelines and recognized international standard in a systematic way. Major requirements areas include general specifications, safety and protection strategies, and power quality requirements. Interconnecting DER with the electric power system is traditionally a complicated process that can be facilitated by improving international harmonization.