SMA WB 3000-US - Manual (Page 7)

SMA America, LLC Turbine operation
Addendum operating requirements DBWB30-40US-UUS113610 7/12
3.2 Characteristic curve operation
Startup Procedure
If the inverter has enough voltage and power, the startup process is displayed by means of
simultaneous lighting of the three LEDs on the inverter.
As soon as the DC input voltage defined in the parameter "Vpv-Start" is reached, the inverter starts a
number of self-tests and measurement processes and synchronizes with the grid. This operating mode
is indicated by means of the green LED blinking on the inverter.
When the tests are successfully completed and the DC input voltage is above "Vpv-Start", for the time
configured in "T-Start", the inverter connects to the grid and the green LED lights up. The inverter then
switches to characteristic curve operation, and regulates the input current according to the generator
voltage.
Characteristic Curve Operation
After the startup procedure, the inverter switches to characteristic curve operation, and regulates the
input current according to the generator voltage.
The inverter then begins to put a load on the wind turbine system and then according to the present
input voltage, takes power from the wind turbine system and feeds it into the grid. The maximum
power corresponds to the maximum AC power of the inverter. However, it can be reduced using the
"Pmax" parameter.
Shutdown Procedure
If the wind strength is so low that the DC input voltage falls below the minimum voltage of the
operating range „Turbine Mode“, the inverter ceases feeding power into the mains grid for the period
defined in "T-Stop". When the DC input voltage increases again, the inverter switches back to
characteristic curve operation.
If the DC input voltage for the time set in "T-Stop" falls below the minimum voltage of the operating
range „Turbine Mode“, the inverter will switch off.
If the DC input voltage is no longer sufficient to supply the on-board electronics with power, the
inverter deactivates immediately.
Characteristic curve operation
The characteristic curve of the Windy Boy only approximates the actual characteristics of a real
small wind energy system. Consult the manufacturer of your wind generator for its typical
characteristics before changing the curve parameters.