Internal power limitation
Parameters for external power limita-
tion
Parameters for power limitation
Status = active
Status = active
Parameters in SunSpec model 123:
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. 9:
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. 85:
Power gradient according to sample parameters and calculation
The following formulae are used to calculate the Q filter parameter and cos-phi gradient:
Fig. 86:
Formula for calculating the Q filter parameter
Fig. 87:
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 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.
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
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