Internal power limitation
Parameters for external power limita-
tion
Parameters for power limitation
Maximum apparent power S
lim
=
100000 VA
“WMaxLimPct” = 50% P
lim
(approx. 40000 W)
“WMaxLimPct_RvrtTms” = 60 s
“WMacLimPct_RmpTms” = 2 s
“WMaxLim_Ena” = 1
Maximum active power P
lim
= 80%
(approx. 80000 W)
AC fallback active power Pfb = 75% P
lim
(approx. 60000 W)
PT1 settling time = 1 s
Tab. 5:
Sample parameters for power limitation
If the ramp time
“WMacLimPct_RvrtTms”
in the SunSpec model is specified as 0 s, then the internal output gradient
is used. Otherwise, the set value will be used.
Irrespective of the communication protocol used, the settling time
“WMaxLim_Ena”
is used in order to transfer the new
power value. Otherwise, the internally configured value will be used.
The additional ramp time “
WMacLimPct_RmpTms”
specifies the jump time from a power value to the new power
value.
The following formulae are used to calculate the gradient S
lim/min
:
Power / kVA resp. kW
Time / s
S
lim
=100
P
lim
=80
P
fb
=60
WMaxLimPct =40
10
20
30
40
50
60
70
Gradient = -600 % S
lim
/min
Fig. 48:
Power gradient according to sample parameters and calculation
The following formulae are used to calculate the Q filter parameter and cos-phi gradient:
Fig. 49:
Formula for calculating the Q filter parameter
Fig. 50:
Formula for calculating the cos-phi gradient (internal power gradient)
10.2.2
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.
Kaco blueplanet 29.0TL3
Page 62
EN
