Country-
spec. Set-
tings
Men
u
level
Display/
Setting
Action in this menu/meaning
1st node … 10th node
0V - Max. voltage in
continuous operation
Voltage of the node in volts.
The voltage values of the nodes must increase continuously. At voltages
below the 1st node and voltages above the last node, the reactive
power value of the 1st or last node is used each time.
1 – 0.3
Reactive power of the node as a percentage of the maximum power
Over-excited | under-
excited
Reactive power mode Under-excited relates to inductive load, over-ex-
cited relates to capacitive load.
10.2
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 communication functions
P limit
and
P set
are available for managing load flows in a plant. If necessary, this
can be used to reduce the feed of the inverter.
If voltage surges in the upstream distribution network cannot be compensated sufficiently by the absorption of reactive
power, it may be necessary to adjust the active power. In this case, P(U) control is available to make optimum use of the
absorption capacity of the upstream grid.
Feed-in inverters must participate in frequency maintenance in the interconnected grid. If the grid frequency leaves the
normal tolerance band (e.g. ±200 mHz), a critical grid condition exists. Overfrequency is a generation surplus, underfre-
quency is a generation shortage. With overfrequency, photovoltaic systems and electricity storage systems must reduce
their effective feed-in power relative to the frequency increase. The function P(f) is available for this purpose. .
However, depending on the selected country setting, the availability or adjustability of the functions may be limited. This
is particularly the case if the applicable grid connection directive requires this restrictiont.
Dynamics / accuracy
In all of the control methods described below the specified target value at the inverter’s connection terminals is adjusted
using a stationary deviation of the reactive power of maximum 2%
N
SN.
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) Active power limitation [See section 10.2.1
P limit (communication) Active power limitation [See section 10.2.1
P(U) (characteristic curve) Voltage-dependent power reduction P(U) [See section 10.2.2
P(f) (characteristic curve) P(f) [See section 10.2.3
10.2.1
Active power limitation
The function “P target value” is only available for MODBUS/SunSpec communication, inverter 64201 “WSetPct”. The func-
tion is used for managing the load flows of the battery and in a plant. If the target value is changed, the new value is ad-
opted by way of a filter and a gradient limitation.
KACO blueplanet gridsave 50.0TL3-S
Page 55
EN
