Kaco blueplanet gridsave 92.0 TL3-S Manual page 71

Manual
The transient response of the control methods is determined by a PT-1 filter. In this case, the settling time corresponds to
5 Tau, or in other words, achieving approx. 99% of the final value for a PT-1 filter. Subject to the control method selected,
there are also other parameters that determine dynamic behaviour.
Methods for active power regulation
Methods for regulating the active power of feed-in inverters may be necessary for local management of load flows, for
voltage stability in the distribution network and for ensuring the stability of the interconnected grid.
The device makes use of the following functions in order to regulate the active power. These are described in the follow-
ing section:
– P target value (MPPT(communication))
– P limit (communication)
– P(U) (characteristic curve) [See section 10.2.1} Page 71]
– P(f) (characteristic curve) [See section 10.2.2} Page 73]
10.2.1 Voltage-dependent power reduction P(U)
If it is not possible to compensate adequately for increase in voltage in the upstream distribution network by intake on re-
active power, it may be necessary to curtail the active power. In this case, P(U) control is available for making optimum
use of the capacity of the upstream grid.
P(U) control reduces the active power that is fed in as a function of the grid voltage using a prescribed characteristic curve
as a basis. P(U) control is implemented as an absolute power 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 abso-
lute power limit.
[See figure 55 [} Page 71] and [See figure 56 [} Page 71] are two examples of configuration. In figure 1 without hyster-
esis, the function is activated as soon as the voltage exceeds the configured voltage of data point 1 (dp1). The power limit
follows the characteristic curve, a straight line between dp1 and dp2. The function is deactivated as soon as the voltage
falls below dp1. In [See figure 56 [} Page 71], the function is activated as soon as the voltage exceeds the configured
voltage of dp2. In this case, dp1 does not result in activation of the function because the power limit remains at 100%.
The power limit follows the characteristic curve, a straight line between dp2 and dp3. However, because hysteresis is ac-
tivated, the power limit is not increased when the voltage drops. The function is deactivated as soon as the voltage falls
below dp1.
P / Pref
dp 1
dp 2
Fig. 55: Example characteristic curve without hysteresis
In the case of storage inverters, the function is only available in discharge/grid feed-in mode, not in battery charging
mode.
10.2.1.1 Parameters for P(U)
Country- Men Display/
spec. Set- u Setting
tings level
Operation mode
3
1 2 4 4
Off | On
blueplanet gridsave 92.0 TL3-S blueplanet gridsave 110 TL3-S blueplanet gridsave 137
TL3-S
Specifications | 10
P / Pref
dp 1
Voltage
Fig. 56: Example characteristic curve with hysteresis and a
deactivation threshold below the activation threshold
Action in this menu/meaning
F Activate the control process.
Off: Deactivates dynamic grid support using dynamic reactive current.
Dynamic grid support remains active on account of immunity to inter-
ference.
dp 2
dp 3
Voltage
Page 71