4 Limit Maximum Real The utility issues a direct command to limit the Autonomous H H O Larger DERs or Power: Limit maximum maximum real power output at the ECP or PCC. The large groups of Local: Monitor real real power output at an reason might be that unusual or emergency DERs where ICT power output at PCC ECP or the PCC upon a conditions are causing reverse flow into the feeder’s capabilities are ICT: Utility issues a direct command from substation or because the total DER real power available command to limit the the utility output on the feeder is greater than some real power output at percentage of total load. The command might be an the ECP or PCC absolute watt value or might be a percentage of DER output. This function is feasible only if the ICT infrastructure is available. It might also be used to ensure fairness across many DER systems. 5 Set Real Power: Set The utility either presets or issues a direct command Autonomous H O O Larger DERs or actual real power output to set the actual real power output at the ECP or PCC multiple DERs Local: Monitor real at the ECP or PCC (constant export/import if load changes; constant within a facility power output at PCC. watts if no load). The reason might be to establish a ICT: utility issues a base or known generation level without the need for command to modify the constant monitoring. This is the approach often used real power output at today with synchronous generators. This function is the ECP or PCC including feasible only if the ICT infrastructure is available. for charging or Meter reads could provide 15-minute energy by the discharging storage end of the day could provide production information systems for operational planning.
4 Limit Maximum Real Power: Limit maximum real power output at an ECP or the PCC upon a direct command from the utility The utility issues a direct command to limit the maximum real power output at the ECP or PCC. The reason might be that unusual or emergency conditions are causing reverse flow into the feeder’s substation or because the total DER real power output on the feeder is greater than some percentage of total load. The command might be an absolute watt value or might be a percentage of DER output. This function is feasible only if the ICT infrastructure is available. It might also be used to ensure fairness across many DER systems. Autonomous Local: Monitor real power output at PCC ICT: Utility issues a command to limit the real power output at the ECP or PCC H H O Larger DERs or large groups of DERs where ICT capabilities are available 5 Set Real Power: Set actual real power output at the ECP or PCC The utility either presets or issues a direct command to set the actual real power output at the ECP or PCC (constant export/import if load changes; constant watts if no load). The reason might be to establish a base or known generation level without the need for constant monitoring. This is the approach often used today with synchronous generators. This function is feasible only if the ICT infrastructure is available. Meter reads could provide 15-minute energy by the end of the day could provide production information for operational planning. Autonomous Local: Monitor real power output at PCC. ICT: utility issues a command to modify the real power output at the ECP or PCC including for charging or discharging storage systems H O O Larger DERs or multiple DERs within a facility
SIWG_Phase_3_Functions_v3.docx