Kaco blueplanet gridsave 92.0 TL3-S Manual page 77

Manual
U U
A A A AC OVR AC OVRT max RT R T m m m
[ V Ph - N ]
290
280
27
AC
270
260
630
Fig. 64: Minimum DC voltage for AC overvoltage immunity
The interface protection (voltage, frequency, anti-islanding) integrated in the inverter is configurable in a range allowing
the behaviour above. However, if the interface protection setting is limiting the voltage time characteristic, the interface
protection will trip and interrupt the ride through as configured.
10.3.2 Dynamic grid support using a fast feeding of residual current
When dynamic grid support using a fast feeding of residual current is activated, then residual current is fed in in addition
to the immunity to interference properties against drops and spikes described above.
The inverter adapts its current feed as soon as a drop or spike incident occurs in order to bolster the grid voltage. The
support takes place in the event of voltage drop in the form of overexcited reactive current (corresponds to a capacitive
load), in the event of voltage spike in the form of overexcited reactive current (corresponds to an inductive load). In the
reactive current priority mode, the effective current is reduced to the extent necessary to comply with the limits of the
maximum continuous current of the inverter.
A dip or swell is detected if either the normal operating voltage range setting is exceeded by at least one phase-phase or
phase-neutral voltage, or if a voltage jump in the positive or negative sequence component greater than the deadband
setting occurs. The magnitude of the voltage jump of the positive and negative sequence corresponds to the difference
between the pre-fault voltage and the actual voltage based on the reference voltage. The pre-fault voltage is calculated
as a 50-periods mean value.
Fig. 65: Formula no. 1
The reactive current is adapted using a response time of <20 ms and a setting time of <60 ms after the incident has oc-
curred. Responses to changes in the voltage during the incident or to the voltage recovery at the end of the incident take
place with the same dynamic.
The formula for calculating the dynamic reactive current that is fed for the positive or negative phase sequence voltage is:
Fig. 66: Formula no. 2, depending on the nominal current IN of the inverter
For the positive and negative phase sequence voltage, Δu equates to the difference between the pre-fault voltage and the
current voltage based on the reference voltage. The pre-fault voltage is calculated as a 1-min mean value.
Fig. 67: Formula no. 3
On account of the definition of a voltage jump in pre-norm EN50549-2 and in VDE-AR-N 4120 and VDE-AR-N 4110, it is
typically the case that another voltage jump is detected when the incident is at an end, when the fault is rectified and
when the voltage returns to a normal state. The result of this is that in an active operation mode a dynamic grid support
using a fast feeding of residual current remains active even after the incident has passed and that reactive current is fed
in according to the formulae (2) and (3). Dynamic grid support using fast feeding of residual current is then deactivated
after a configured minimum support time, usually 5 s.
I
I
b
1
Fig. 68: Formula no. 4
blueplanet gridsave 92.0 TL3-S blueplanet gridsave 110 TL3-S blueplanet gridsave 137
TL3-S
28 .5V / 66
AC DC
/ 63
DC
650 670
Specifications | 10
U
690 D DC D DC min m
[ [ V [ ]
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