Kaco blueplanet gridsave 92.0 TL3-S Manual page 73

Manual
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 tolerance 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 adapt their feed-in power relative to the frequency deviation. In the event of overfrequency,
the power adjustment is determined by a maximum feed-in limit, in the event of underfrequency, 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
Gleichung 1 [See figure 57 [} Page 73] defines the maximum limit with ΔP relevant to 2 [See figure 58 [} Page 73], P
the current power at the time of activation and P
Fig. 59: Equation 3
Fig. 60: Equation 4
In some standards, the power adjustment is specified by a drop (s) instead of a gradient (g), as shown in equation 3 [See
figure 59 [} Page 73]. The drop s can be transformed into a gradient g in accordance with equation 4 [See figure 60
[} Page 73].
The frequency f remains above the activation threshold f
sion (f – f) is negativ and ΔP corresponds to a reduction in the feed-in power or an increase in the charging capacity. The
1
frequency f remains below the activation threshold f
(f – f) is positive and ΔP corresponds to an increase in the feed-in power or an reduction in the charging capacity..
1
Depending on the operating point of the inverter at the time of activation, the configured power reference and the con-
figured 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.
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.
Rate limited power increase after
deactivation of response
100 % P
M
60 % P
M
50 , 5 51 , 0
50 , 2
Frequency [Hz]
Fig. 61: Example behaviour with hysteresis (mode 1)
blueplanet gridsave 92.0 TL3-S blueplanet gridsave 110 TL3-S blueplanet gridsave 137
TL3-S
the configured reference power.
ref
during an underfrequency incident. Consequently, the expression
1
P P P = P = = P P P P
re ref ef f e M M M
f f = = = = = 5 5 50, 50 , 2 Hz
1 1 1
s s s 5 = 5 5% 5 % % %
f = 50 , 1 Hz
stop p
51 , 5 52 , 0
Specifications | 10
during an overfrequency incident. Consequently, the expres-
1
P
ref
f = 49 9 , 8 Hz
1
s = 5 %
47 7 , 5 48 , 0 48 , 5 49 , 0
Frequency [Hz]
Fig. 62: Example behaviour without hysteresis (mode 2) At
the time of activation, the inverter is in charging mode at
20% charging capacity.
80 % P
max
= P
max
20 % P
max
generating mode
49 , 5 49 , 8 Charging mode if
applicable
- 20 0 % P
max
M
Page 73