SMA WB 3300-11 Installation - Manual (Page 38)

Electrical Connection SMA Solar Technology AG
38 WB33-38-IA-IEN120940 Installation Manual
5.8 Polynomial Curve
The polynomial curve is a programmable power curve which is dependent on the DC input voltage.
By adapting the default polynomial curve to the small wind turbine system being used, you can
optimise the energy output of the system.
To adapt the polynomial curve of the inverter to the wind turbine system being used, you can change
the following parameters on the PC with the "Windy Boy Setup Tool" (www.SMA.de/en):
• Vpv-Start
• UdcWindStart
• Wind_a0 ... Wind_a3
• Pmax
• P-Wind-Ramp
• KP-Wind-Reg
• KI-Wind-Reg
• T-Stop
A description of the operating parameters is available in the download area at www.SMA.de/en in
the category "Technical Description" of the respective inverter.
The inverter regulates its output power according to the generator voltage. The following diagram
shows the function of a typical polynomial curve in a WB 3300 / WB 3300-11 / WB 3800 /
WB 3800-11. Here, the AC power fed in is depicted as a function of the DC input voltage of the
inverter.