Impact of Energy Storage on Load Balancing

The paper demonstrates the possible application of Energy Storage to provide Ancillary Service to Transmission System Operators (TSO) for load balancing. Energy Storage can facilitate the coverage of fast load increase during the morning ramp, when in 5-6 hours the generation has to cover over 30% of the daily maximum. The optimization of Energy Storage operation is synchronized with the start-ups of the conventional power units and energy generated before the reaching the minimum power level. Despite Energy Storage has excellent technical features allowing for fast power regulation, its wider implementation to correct daily load profile is limited due to relatively small periods of energy storage, usually 4-6 hours. In several hours after the morning ramp, the TSO faces the peak demand so it has to start the conventional power units earlier decreasing the scope of power demand that could be covered by Energy Storage. The simulation is based on the data from the Polish power system published by PSE. SA.