SMA WB 5000 - Manual (Page 13)

SMA Technology AG Unit description
Operating instructions WB50_60-11:FE4105 Page 13
3 Unit description
3.1 Appropriate usage of the Windy Boy 5000 / 6000
The Windy Boy 5000 / 6000 is designed for the conversion of DC voltage from a
wind turbine (permanent magnet generator) into AC voltage for feeding into the
public mains supply. The technical data are described in more detail in chapter 9
"Technical data” (page 49).
Many wind turbine manufacturers offer an extra over-voltage protection module.
These components prevent the destruction of the downstream Windy Boy in the case
of overvoltage.
Overvoltage can occur under the following conditions:
• High turbine rotation speeds under strong wind conditions
• An increase in turbine rotation speed caused by load-shedding when the Windy
Boy is disconnected from the mains supply e.g. in the case of mains interference
or power outage.
The overvoltage protection system has the following tasks:
• When a pre-defined voltage is reached, the Windy Boy is disconnected from the
generator and a short-circuit slows the generator and/or brings it to a standstill.
• Some devices reduce the turbine rotation speed, and thus the generator output
voltage, by switching in a resistor assembly (Dumpload). The electrical energy
generated by the turbine is then converted to heat.
Converter Wind Generator Windy Boy Public Mains Grid
Control unit
Rectifier
Control unit
Overvoltage Protection Netzw echselr ichter fü r Wind energie anlage n
Grid tie d inve rter for wind tu rbines
Windy Boy
Netzwe chselric hter für Winden ergiean lagen Grid tie d inve rter for wind tu rbines
Pac 903W Upv 3 30V