At reception of a P limit set value, the output power of the inverter is limited to the specified power value. If the limit
value is changed, the new value is adopted by way of a filter and a gradient limit. The actual power may be below the con-
figured limit value as the available power (PV), set power value (Storage) respectively may be below the configured limit
value. Depending on the inverter series, the settling time and gradient limit are adjustable.
Increasing output gradient
[
WMaxLimPct_RmpTms
]
&
Decreasing output gradient
[
OutPFSet_RmpTms
]
1 – 65534 [% °S
max
° /°min]
Specifies the dynamic behaviour at
change of active power set point.
The active power is changed with
the specified gradient.
NOTE: The gradient is superim-
posed with the settling time.
Settling time
[
VArPct_RmpTms]
200 – 60000 [ms]
Specifies the dynamic behaviour at
change of active power set point.
The active power is changed accord-
ing a PT-1 characteristic with a set-
tling time equal to 5 Tau.
NOTE: The settling time is superim-
posed with the increase and de-
crease gradient.
If the applicable grid code requires the active power response to set point by a defined gradient or settling time, the de-
vice can be configured to comply with this gradient. It is also possible to implement the gradient in the plant control sys-
tem. This second solution must be applied for all other inverters.
10.4.2 Voltage-dependent power reduction P(U)
If it is not possible to compensate adequately for voltage increase in the upstream distribution network by consumption
of reactive power, it may be necessary to curtail the active power. In this case, P(U) control is available for making opti-
mum 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. The P(U) control is implemented as an absolute power limit. The actual power of the inverter may vary
freely below this limit based on possible fluctuation of the available power or set point, but will never increase above the
absolute power limit.
Page 78] and GRA_P(U)_Mode_2 are two example configurations. In case of the Figure 1 without hys-
teresis the function is activated once the voltage exceeds the configured voltage of data point 1 (dp1). The power limit
follows the characteristic, a straight line between dp1 and dp2. The function is deactivated once the voltage falls below
dp1. In case of GRA_P(U)_Mode_2 the function is activated once the voltage exceeds the configured voltage of dp2. dp1
is not activating the function in this case as the power limit remains at 100%. The power limit follows the characteristic, a
straight line between dp2 and dp3, but due to the activated hysteresis, the power limit is not increased at falling voltage.
The function is deactivated once the voltage falls below dp1.
Voltage
P
/
Pref
dp
1
dp
2
Fig. 79:
Example characteristic without hysteresis
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 78
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