Kaco blueplanet gridsave 110 TL3-S, Manual

Page: 73 / 93

Country-
spec. Set-
tings Men
u
level Display/
Setting Action in this menu/meaning
Number of nodes
2 - 5
Power
0.0 – 100.0 [% P
ref
] /
100.0 [% P
ref
] / 0.1
Voltage
80.0 – 126.0 [%
U
nom
] / 112.0 [%
U
nom
] / 0.1
up to 5 support points definable The power value of the first and last
value pair is also used as the maximum or minimum active power value
that is valid across the limits of the characteristic curve.
10.2.2 P(f)
Adjusting the active power P(f) in the event of overfrequency and underfrequency
Feed-in inverters must assist with frequency stability in the grid. If the grid frequency leaves the normal toler-
ance range (e.g. ±200 mHz), then the grid will be in a critical state. In the event of overfrequency, there is a
generation surplus, in the event of underfrequency, there is a generation deficit.
Power storage systems must adjust their effective feed-in power relative to the frequency deviation. In the
case of overfrequency, the power adjustment is determined by a maximum feed limit, and in the case of under-
frequency by a maximum charging limit. The actual power of the inverter may vary freely below this limit due
to a possible fluctuation in the available power or the target value, but at no time increases above the absolute
power limit.
Fig. 57: Equation 1
Fig. 58: Equation 2
Equation 1 [See figure 57 [ } Page 73] defines the maximum limit with ΔP corresponding to equation 2 [See
figure 58 [ } Page 73], P
M
the actual power at the time of activation and P
ref
the configured reference power.
Fig. 59: Equation 3
Fig. 60: Equation 4
In some standards, the power adjustment is not defined by a gradient (g), but by a slope (s), as given in equa-
tion 3 [See figure 59 [
} Page 73]. The slope s can be converted into a gradient g according to equation 4 [See
figure 60 [
}
Page 73].
During an overfrequency event, the frequency f is above the activation threshold
f
1
. Consequently, the expres-
sion (
f
1
–
f
) is negative and ΔP corresponds to a reduction in the feed-in power or an increase in the charging
power. During an underfrequency event, the frequency f is below the activation threshold
f
1
. Consequently,
the expression (
f
1
–
f
) is positive and ΔP corresponds to an increase in the feed-in power or a reduction in the
charging power.
Depending on the operating point of the inverter at the time of activation and on the configured power refer-
ence and gradient, the inverter may switch from charging to feed-in mode in the event of underfrequency or
from feed-in to charging mode in the event of overfrequency ().
The measurement accuracy of the frequency is greater than 10 mHz.
Manual Specifications | 10
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