Kaco 1001623, Manual

Page: 82 / 115

Fig. 93: Equation 4
In some standards the power adaption is not defined by a gradient – g but by a droop – s as in Equation 3 [See figure 92]
[
}
Page 81]. The droop s can be converted to a gradient g according to Equation 4 [See figure 93] [
}
Page 82].
During an overfrequency event the frequency f is above the activation threshold
f
1
Therefore the term (
f
1
–
f)
is nega-
tive and ΔP is a in-feed power reduction.
The measurement accuracy of the frequency is better than 10mHz.
The specific mode of operation of the function is specified by the grid operator or by applicable standards or grid codes.
The configurability of the function makes it possible to meet a wide variety of standards and grid codes. Certain configura-
tion options are not available in some country settings because the applicable standards or grid codes prohibit adjust-
ments.
P(f) Active power response to underfrequency
Some grid codes also require P(f) active power response to underfrequency. As PV plants typically operate at maximum
power point there is no available power reserve to increase power in case of underfrequency.
However, in case of curtailment of the Plant due to market control, active power increase up to the available power is
possible. As the inverter is not able to distinguish P constant set values between mandatory congestion management of
the grid operator and market control this needs to be implemented in the site specific plant control infrastructure.
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. 94: Example behaviour without hysteresis (Mode 2)
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
ref
M
=%P ]
Rate limited power increase after
deactivation of response
Fig. 95: Example behaviour with hysteresis (Mode 1)
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. See figure 3.
Mode 2: Without hysteresis activated. --- FEHLENDER LINK ---
Power reference mode
with overfrequency
Actual power |
Nominal power
Power reference mode
with underfrequency
Actual power |
Nominal power
Power reference with overfrequency:
Power reference for power adjustment as in equation 6 and equation 7
for overfrequency incidents.
Power reference with underfrequency:
Power reference for power adjustment as in equation 6 and equation 7
for overfrequency incidents.
KACO blueplanet 87.0 TL3 KACO blueplanet 92.0 TL3 KACO blueplanet 110 TL3 KACO blueplanet 125 TL3
KACO blueplanet 137 TL3 KACO blueplanet 150 TL3
Page 82
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