Advanced Islanding Detection - Kaco blueplanet 87.0 TL3 Manual

10.4.2.1 Parameter for power ramp
Power ramp
4
1 2 3 4
Gradient
1 – 600 [% / min]
After every connect
After first connect
After grid error
10.4.3 Normal operation power gradient
In the case of very large plants, it may also be necessary to restrict the change in power level during normal operation. If
the set value (for increase and decrease in power level) and the solar irradiation change (for increase in power level), then
the grid feed-in power is increased or decreased in line with the configured gradient. A limitation is not possible if the
solar irradiation is reduced.
The function is not active for power changes defined by other grid support function such as power recovery after fault
ride through, P(f), P(U).
10.4.3.1 Normal operation power gradient
Country- Men Display/
spec. Set- u Setting
tings level
Operation mode
On/Off
Increasing gradient
1-65534 [% S
Falling gradient
1 – 65534 [% S
10.5

Advanced islanding detection

Due to decentralized generation, there is the possibility that a deactivated part of the grid will remain live in an uninten-
ded island due to the balance of load and generation in this part of the grid. The detection of unintended island formation
is an important function of decentralized generating units and is related to the prevention of damage to equipment as
well as safety of personnel.
Depending on the structure and the operation of the distribution grid several dangers exist:
ž In case of maintenance work in a distribution grid, personnel may be placed in danger if the deactivated part of the
grid remains live as an island. This is especially the case if not all safety rules are followed.
ž If fast auto-reclosure is used in a distribution grid and the deactivated part of the grid remains live as an island, reclos-
ure will likely happen during phase displacement which might cause damage to rotating machinery on the grid.
ž In the event of a fault in a medium voltage grid, the faulty part of the grid is disconnected. If the fault has a significant
resistance, the deactivated part of a medium-voltage grid remains live as an island. Depending on the type of fault, but
explicitly in case of a fault in the transformer, dangerous medium voltage might be accessible or even present in low-
voltage appliances.
Page 88
NOTE: The power ramp allows a moderate increase of the Perform-
ance possible
Gradient of power limit. The maximum power limit increase to 100% of
nominal power with the gradient specified.
Soft start ramp up is activated for every connection of the inverter to
the grid
Soft start ramp up is activated for the first connection of the inverter to
the grid on a particular day or after complete reboot of the inverter (AC
and DC disconnected)
Soft start ramp up is activated for connection of the inverter to the grid
after trip of the internal interface protection or via the external grid pro-
tection port (Powador-protect)
Action in this menu/meaning
Activate or disable the power gradient limitation in normal operation.
The change in the active power is limited to a configured power increase
gradient
/ min]
max
The change in the active power is limited to a configured power de-
crease gradient.
/ min]
max
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