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 underfre-
quency. Due to the fact that PV systems are typically run at the maximum power point, there are no power re-
serves 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. 47:
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. 48:
P(f) example characteristic without hysteresis Mode 2
10.2.4.1 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.
Activation threshold
with overfrequency
50.2 – 70 (Hz)
Activation threshold
with underfrequency
40 – 45 (Hz)
Activation threshold (f1) overfrequency:
Determines the frequency threshold for activating the function in case
of overfrequency incidents. The active power adjustment is activated if
the frequency rises above the configured value and mode 1 or 2 is activ-
ated.
In mode 2, the function is deactivated if the frequency falls below the
configured value.
Activation threshold (f1) underfrequency:
Determines the frequency threshold for activating the function in case
of underfrequency incidents. The active power adjustment is activated if
the frequency falls below the configured value and mode 1 or 2 is activ-
ated.
In mode 2, the function is deactivated if the frequency rises above the
configured value.
P(f) intentional delay
0 – 5,000 [ms]
The activation of the function based on the activation threshold is
delayed by the configured time.
Note 1: This function is regarded as critical for the stability of the trans-
mission grid and is therefore prohibited by several national grid connec-
tion regulations.
Note 2: This function is stipulated as a requirement by some domestic
grid connection directives in order to prevent any negative impact on is-
land detection. However, P(f) has no negative impact on KACO's en-
hanced island detection.
10 | Specifications
Manual
KACO blueplanet 15.0TL3 KACO blueplanet 20.0TL3
Page 64
EN
Содержание blueplanet 15.0 TL3
Страница 95: ......
