Kaco 1000335, Manual

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In some standards, the power adjustment is specified by a drop (s) instead of a gradient (g), as shown in equation 3 [See
figure 51] [
} Page 61]. The drop s can be transformed into a gradient g in accordance with equation 4 [See figure 52]
[ } Page 61].
The frequency f remains above the activation threshold
f
1
during an overfrequency incident. Consequently, the expres-
sion (
f
1
–
f
) is negative and ΔP corresponds to a reduction in the feed-in power.
The measurement accuracy of the frequency is greater than 10 mHz.
The specific mode of operation of the function is specified by the grid operator or the pertinent standards or the grid con-
nection guidelines. The configurability of the function makes it possible to satisfy a wide variety of standards and
guidelines. Certain configuration options are not available in some country settings because the pertinent standards or
grid connection guidelines prohibit adjustments.
Adjusting the active power P(f) in the event of underfrequency
Some grid connection guidelines also require adjustment of the active power P(f) in the event of underfrequency. Due to
the fact that PV systems are typically run at the maximum power point, there are no power reserves for increasing the
power in the event of underfrequency.
However, in the event that the system power is reduced due to market regulation, it is possible to increase the active
power up to the power level available. Because the inverter is unable to distinguish between P constant target values for
obligatory bottleneck management by the grid operator and for market regulation, this needs to be implemented in the
site-specific infrastructure of system control.
52 , 0 51 , 5 51 , 0 50 , 5 50 , 2
100 % P
M
60 % P
M
P
ref
= P
M
P
f P
1
re
=
eff
= =P
e
50
P
,
P
M
P
2
M
Hz f
1
s
1
= =
=
= =5 5
5
50,
% s
f s 5
stop
5% 5
p
=
% %
50 , 1 Hz
Frequency [Hz]
Active Power [%P
Re f
M
=%P ]
Fig. 53: Example behaviour with hysteresis (mode 1)
52 , 0 51 , 5 51 , 0 50 , 5
50 , 2
100 % P
M
60 % P
M
P
ref
= P
M
P
f P
1
ref
=
f
=P
f
50
P
,
P
M M
P
2 Hz f
1
s
=
=
=5 5
5
50,
% s s
f s 5
stop
5 5% %
=
% % % % %
deactivated
Frequency [Hz]
Active Power [%P
ref
M
=%P ]
Rate limited power increase after
deactivation of response
Fig. 54: P(f) example characteristic without hysteresis Mode
2
10.2.3.1 Parameters for P(f)
Country-
spec. Set-
tings Men
u
level Display/
Setting Action in this menu/meaning
P(f) operation mode
Off | Mode 1 | Mode 2
Activate or deactivate function.
Mode 1: With hysteresis activated.
Mode 2: Without hysteresis activated.
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