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When the installation's consumption is lower than the previ-
ously-defined
P
supplied from the solar panel power and the shortfall comes
from the grid, while the battery is charged from the grid sur-
pluses (these surpluses are the grid power that is missing until
the
P
value is reached) and from the solar panel surpluses,
MAX
if there are any.
Scenario 2:
Consumption of the installation higher than
2.
but solar panel power higher than the consumption peak.
Fig. 14. "PeakLoad2" function diagram
Grid (= P
)
MAX
PV surpluses
PV
Fig. 15. Work priorities in "PeakLoad2".
In this case, the installation's consumption is higher than
resulting in an over-peak consumption, but this over-peak
is resolved with the solar panel power. Their surpluses are
directed to the battery charge.
Scenario
2.1: Consumption of the installation higher than
3.
P
and over-peak consumption higher than solar panel
MAX
power.
Fig. 16. "PeakLoad2.1" function diagram
64
parameter, the consumption loads are first
MAX
Prioritisation
Battery charge
Supplying the loads
-
2
1
-
1
Grid (= P
Battery
Fig. 17. Work priorities in "PeakLoad2.1".
P
,
MAX
When the consumption power is higher than
the over-peak consumption is unattainable with the solar panel
power, the battery power is used to supply the missing con-
sumption.
To better illustrate all the scenarios described in the "Peak-
load" operation, the following graph has been created that
simulates the energy flows in a photovoltaic installation with
battery for one day:
Power (kW)
30%
-
P
,
MAX
Fig. 18. Simulation of energy flows per day.
Red shows the installation's consumption, green the power
generated from solar panels, yellow the battery's state of
charge and blue the battery power (negative power indicates
that the battery is charging and positive power indicates that
it is discharging). The red line indicates the established power
limit contracted from the grid
narios described above can be seen clearly.
Prioritisation
Battery charge
)
-
MAX
-
PV
-
Consumption
PV generation
Battery
SOC
Scenario 1
Scenario 2 Scenario 2.1
(P
). In Fig. 18, the three sce-
MAX
Supplying the loads
2
3
1
P
and also
MAX
100%
Pmax
Time (h)
Scenario 1
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