Comparison of current control for low harmonic distortion applied to a small wind generation system with permanent magnet synchronous generator

This paper presents a comparison between of two type of current control to reduce the THDi and increase the PF in a Three-Phase Boost Rectifier driving a small wind turbine. The two types of current controls are peak current mode control and average current mode control It is used as the input stage of small wind turbines with permanent magnet synchronous generators operating at variable speed. The Boost Rectifier output is connected to an inverter which injects the energy to a distribution power grid. The operation in discontinuous conduction mode allows significantly reducing the Total Harmonic Distortion of the current in the small wind turbine. However, it is necessary to add an input filter so that the switching ripple doesn´t affect the turbine. The results demonstrate that it is better the peak current mode control, because it is achieved a smaller THDi and a higher PF in all over the operating range of the generator.