SMA
Technologie AG
Unit description
Operating instructions
WB11_17-11:FE4205
Page 13
3 Unit description
3.1 Appropriate usage of the Windy Boy
The Windy Boy is designed for the conversion of DC voltage from a wind turbine
(permanent magnet generator) into AC voltage for feeding into the public mains grid.
The technical data is described in more detail in chapter 8 "Technical data”
(page 47).
Many wind turbine manufacturers offer an extra over-voltage protection module.
These components prevent the destruction of the downstream inverter 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 inverter
is disconnected from the mains grid e.g. in the case of mains interference or po-
wer outage.
The overvoltage protection system has the following tasks:
• When a pre-defined voltage is reached, the inverter is disconnected from the ge-
nerator 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 ge-
nerated by the turbine is then converted to heat.
In grid-connected systems, we recommend the use of one of the electronic protection
mechanisms described here. Please note that overvoltage on the inverter can lead to
destruction of the device. In addition to this, you lose the right to all warranty claims
- even if the maximum input voltage of the inverter is only exceeded for a short time.
Converter
Wind
Generator
Windy Boy
Public mains grid
Windy
Boy
Netzwe
chselric
hter für
Winden
ergiean
lagen
Grid tie
d inverte
r for w
ind turb
ines
Control unit
Rectifier
Control unit
Overvoltage protection
Summary of Contents for Windy Boy 1100
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Page 4: ...SMA Technologie AG Page 4 WB11_17 11 FE4205 Operating Instructions...
Page 12: ...Safety Information SMA Technologie AG Page 12 WB11_17 11 FE4205 Operating instructions...
Page 36: ...Turbine operation SMA Technologie AG Page 36 WB11_17 11 FE4205 Operating instructions...
Page 38: ...Maintenance and care SMA Technologie AG Page 38 WB11_17 11 FE4205 Operating instructions...
Page 64: ...Stand alone systems SMA Technologie AG Page 64 WB11_17 11 FE4205 Operating instructions...
Page 66: ...Contact SMA Technologie AG Page 66 WB11_17 11 FE4205 Operating instructions...
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