SMA WB 5000 - Manual (Page 33)

SMA Technology AG Turbine operation
Operating instructions WB50_60-11:FE4105 Page 33
6 Turbine operation
6.1 Overview
The Windy Boy 5000 / 6000 is a single phase inverter that converts DC current into
AC current and feeds the energy generated by a wind turbine into an existing mains
supply.
The Windy Boy 5000 / 6000 is externally identical to the Sunny Mini Central inverter
for photovoltaic systems.
The Windy Boy 5000 / 6000 inverter has a special operational mode for wind
generators however, which allows performance adjustment to the characteristic
curves of many different manufacturers' generators ("Turbine" operating mode). In
this way maximum yields can be obtained from your wind turbine.
The mechanical power of the wind turbine is presented to the Windy Boy in the form
of a direct, rotation speed variable DC voltage (RPM) and current intensity (torque).
Most small wind turbines have a so-called permanent magnet generator and a
downstream rectifier for converting the variable frequency AC generator voltage into
DC current.
6.2 Characteristic curve function
The "Turbine" operating mode of the Windy Boy 5000 / 6000 uses a programmable
power/voltage curve to regulate the input current depending on the generator
voltage (V/I characteristic curve).
Every wind generator is designed to have an optimum working point for voltage and
current, at different rotational speeds or wind speeds. This behavior is not linear.
The Windy Boy 5000 / 6000 uses an approximation based on a simple ramp
function. The function can be programmed by the user so that it comes close to the
behavior of the wind generator being used and thus provides power adaptation.