Installation and Operator’s Manual Page 10 of 20
(Aurora Wind Interface Rev 4.0)
1.4 Operating Modes of the Wind System:
Mode WBI Output
Voltage
(Vdc)
WBI Diversion
Load
Inverter
Off < 50 Vdc Un properly
powered
OFF OFF
Grid Check 50 < Vdc < 530 Operative OFF Grid Check
Export 50 < Vdc < 530 Operative OFF Exporting to Grid
Export &
Diversion
Vdc > 530 Operative ON Exporting to Grid
Grid Fail Vdc >530 Operative ON * Grid check
Wait the wind < 50 Vdc Un properly
powered
OFF Connected to grid
and back powered
from grid (limited
time)
Table 2: Operating Modes
* dimension diversion load in this state
1.4.1 Off Mode
There is insufficient energy from the wind turbine to allow operation of the system
1.4.2 Grid Check Mode
There is sufficient energy to power the WBI properly and provide power to the
Aurora Inverter.
1.4.3 Export Mode
The Aurora Wind inverter has completed the utility interconnection checks and is
connected to the utility grid. The inverter is exporting power to the utility grid and
following the power curve of the wind generator.
1.4.4 Export & Diversion Mode
The Aurora Wind Inverter is in the Export mode and the WBI output voltage is higher
than 530Vdc. When the Bulk voltage exceeds 530Vdc the diversion load is switched
on and remains on until the Bulk voltage drops below approximately 430Vdc. This
mode is entered during excess wind conditions and gusts.
1.4.5 Grid Fail
The Aurora Wind Inverter has disconnected from the utility grid and the Bulk voltage
exceeds 530Vdc. In this condition the Diversion load is switched on and remains on
until the Bulk voltage drops below approximately 430Vdc.
In this condition dimension diversion load in order not to exceed 580Vdc.
1.4.6 Wait the wind
In case of missing wind, the Aurora Wind Inverter has not any longer power to export
to the grid but it may remain connected to grid, for an adjustable period of time, ready
to export again quickly when wind returns.
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