DC bus control of variable speed wind turbine using a buck-boost converter

For most of the peak power extraction methods in wind turbine generation system described in the current literature, it is necessary to know the wind turbine's maximum power curve and the wind speed measurement. These methods used the maximum power curve obtained via simulations or tests for individual wind turbines. This makes these methods difficult and expensive to implement in practice. In addition, the use of wind speed sensor to measure the wind speed adds to a system a cost and presents some difficulties in practical implementation. This paper describes the design of a buck-boost converter circuit used to achieve the maximum power control of wind turbine driven permanent magnet synchronous generator (PMSG). The PMSG is suitably controlled according to the generator speed and thus the power from a wind turbine settles down on the maximum power point by the proposed MPPT control method, where the wind turbine's maximum power curve and the information on wind velocity are not required.