Specifications; Reactive Power Control - Kaco blueplanet 15.0TL3 Manual

10

Specifications

10.1

Reactive power control

Reactive power can be used in electrical energy supply networks to bolster the level of voltage. As such, feed-in inverters
can contribute to statistical voltage stability. Reactive power brings about a voltage drop at the inductive and capacitive
components of the equipment which can either bolster or reduce the level of voltage. If the generating plant draws in-
ductive reactive power while active power is being fed in, part of the voltage swing caused by the active power feed can
be compensated for by the supply of reactive power.
This reactive power mode and the respective control process are specified by the grid operator. If no control process has
been specified, then the system should be operated using a reactive power specification of 0%.
10.1.1 Operating power range depending on grid voltage
The device can be operated within the respective fixed voltage range provided. The maximum apparent power is stated in
the following table. In the event of undervoltage determined by the maximum continuous current subject to the grid
voltage.
Voltage - devices with U 220 V / 380
N:
V; 230 V / 400 V; 240 V / 415 V
≥ 400
390
at 380
at 360
Tab. 5: Maximum continuous apparent power depending on grid voltage
The following figures show the reactive power-active power operating range for devices with a nominal voltage of U
220/380, 230/400, 240/415. Devices with a nominal voltage of 277/480 correspond to the first figure taking into consider-
ation the voltage values in this table.
P [p.u.]
1,2
1
0,8
0,6
0,4
0,2
0
1 0,6
0,0
underexcited
Fig. 37: P-Q operating range for devices above 12 kVA
10.1.2 Dynamics and accuracy
In all control methods the specified target value at the inverter's connection terminals is adjusted using a stationary devi-
ation of the reactive power of maximum 2% S
power. If the shift factor cos ϕ is specified in the control method, then the deviation relates to the reactive power value
brought about by the current power level.
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.
10.1.3 Reactive power functions
The following functions for controlling the reactive power are implemented in the devices listed above:
ž cos φ constant
ž Q constant
Page 56
Voltage - devices with U
V
≥ 480
468
456
432
above 390V
at 380V
at 360V
0,6 1
Q [P.u]
overexcited
. This maximum deviation always relates to the specified value as reactive
N
270 V / 480 Maximum apparent power [p.u.]
N:
1.04
1.04
1.0
0.95
S [p.u. S ]
nom
1,2
Over load capability
1
0,8
0,6
OVRT
Nominal capability
0,4
0,2
0
540 500 460 420 380
Fig. 38: Apparent power subject to the grid voltage
KACO blueplanet 15.0TL3 KACO blueplanet 20.0TL3
N
Under voltage
UVRT
derating
340
300 260 U [V]