The paper presents the advanced control system of the wind energy conversion
with a variable speed wind turbine. The considered system consists of a wind turbine
with the permanent magnet synchronous generator (PMSG), machine side converter
(MSC), grid side converter (GSC) and control circuits. The mathematical models of a wind
turbine system, the PMSG generator and converters have been described. The control
algorithms of the converter systems based on the methods of vector control have been
applied. In the advanced control system of the machine side converter the optimal MPPT
control method has been used. Additionally the pitch control scheme is included in order
to achieve the limitation of maximum power and to prevent mechanical damage of the
wind turbine. In the control system of the grid side converter the control of active and
reactive power has been applied with the application of Voltage Oriented Control (VOC).
The performance of the considered wind energy system has been studied by digital
simulation. The results of simulation studies confirmed the good effectiveness of the
considered wind turbine system and very good performance of the proposed methods of
vector control and control systems.
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