The purpose of BS PD IEC/TS 62898-1:2017, which is a Technical Specification, is to provideguidelines for microgrid projects planning and specification. Microgrids considered in thisdocument are alternating current (AC) electrical systems with loads and distributed energyresources (DER) at low or medium voltage level. This document does not cover direct current(DC) microgrids.Microgrids are classified into isolated microgrids and non-isolated microgrids. Isolatedmicrogrids have no electrical connection to a wider electric power system. Non-isolatedmicrogrids can act as controllable units to the electric power system and can operate in thefollowing two modes:

grid-connected mode;
island mode.

Cross References:IEC 60038:2009IEC TS 62749:2015IEC 60364IEC 61936IEC 60904IEC 61970IEC 61968IEC 61850IEC 62559IEC 62257IEC 61000-4-30:2015 ED3IEC 61000-2-4:2002 Ed 2IEC 61000-2-2:2002IEC/TS 62898-2 Ed 1.0IEC 62040-1:2017IEC/TS 62913-2-1 Ed 1.0