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19 Smart Grid Conference 2014 (SGC’14) - Grid Renovation Workshop

Example: Operational Impact of Phase-Unbalanced

• Use Case:

– Feeder Voltage: 13.8 kV

– Feeder Base Load: 9 MW phase-balanced (3 MW per phase)

– Participating Demand Response: 900 kW with different amounts on

each phase: 300 kW on Phase A; 100 kW on Phase B; 500 kW on

Phase C

– For simplicity, assume both the base load and the DR are unity

power factor

– When the 900 kW DR is deployed, the remaining load will no

longer be phase-balanced

– This results in neutral current and losses for the remaining load;

thus reducing the effective DR

– For a system operator, it is important to know the expected

effective DR beforehand

– With 1% Neutral Losses for Remaining Load, Net Demand

Reduction: 900 - 1%*8,100 = 819 kW

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SGC DSP Manual do Utilizador Página 19