Regulating Active Power - Kaco blueplanet 92.0 TL3 US Manual

Manual
Country- Men Display/
spec. Set- u Setting
tings level
Power | Voltage |
Excitation
0 – 125 [% S
43.6 [% U
Over-excited | un-
der-excited
10.2

Regulating active power

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%
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)) [See section 10.2.1} Page 87]
– P limit (communication) [See section 10.2.2} Page 87]
– P(U) (characteristic curve) [See section 10.2.3} Page 88]
– P(f) (characteristic curve) [See section 10.2.4} Page 90]
10.2.1 P target value
The function "P target value" is integrated into the MPP tracking of the inverter on all PV inverters. The P target value is
continuously re-calculated on the basis of the MPP tracking algorithm.
10.2.2 P limit
The function "P limit" is available for limiting the maximum feed-in power. If necessary, this can be used to reduce the
maximum possible feed of an inverter, e.g. for managing bottlenecks for the operator of the distribution grid.
P limit is only available via the MODBUS/SunSpec inverter model 123 Immediate Inverter Controls and via
RS485 communication. You can find detailed information on the communication protocol at
the "Software" subsection of the "Downloads" section.
When a target value is received for P limit, 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 limitation. The current power may be be-
low the specified limit value because the available power (PV) or the target power value (storage) may be below the spec-
ified limit value. Depending on the inverter series, the settling time and gradient limitation may be adjustable.
Model Parameter
123 WMaxLimPct
Power Limitation
123 WMaxLimPct_RvrtTm
s
Timeout
KACO blueplanet 92.0 TL3 US KACO blueplanet 110 TL3 US KACO blueplanet 125 TL3 US
Action in this menu/meaning
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
lim
] / 0.1 power value of the 1st or last node is used each time.
nom
Reactive power mode Under-excited relates to inductive load, over-ex-
cited relates to capacitive load.
Scaling factor
WMaxLimPct_S
F
Specifications | 10
SN.
N
R/RW Range Description
0 – 100 [%] Set power limitation to a specific %
RW
value.
0 – 1000 [s] Sets the time after which the inverter, if
RW
it does not receive a new power limit,
will cancel it.
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