ES_60006_ Energy Storage Technologies
Energy
Thermodynamics
Renewable sources of energy
Advantages
Limitations
Need for Energy Storage
Electricity Demand
Components of internal energy of a system
Processes that can change internal energy
of a system
• If energy transfer occurs due to
temperature difference – it appears as
heat
• Force acts on a system through a
distance - energy transfer is work
transfer
What happens to frequency when contingencies occur??
• Frequency shows instantaneous
difference in supply and demand.
• Frequency decreases -> deficit in
supply
• Frequency increases -> more
supply than demand
• Short time inertial stability can be
provided by large grids
• Grid should be maintained between
frequency thresholds (upper and
lower limits)
Renewable integration to the grid – What does this do??
• Solar PV systems – inertialess power generators
• Electronic injection of power to the grid
• When grid frequency decrease due to contingencies – they cannot stabliize the
grid by inertial energy.
• As renewable power generation penetrates more and more into the grid
• Need for energy storage due to intermittent (unpredictable) and
inertialess renewable energy – more frequency fluctuations