Electronic circuit for stand-alone wind energy conversion system

This paper presents an electronic circuit for stand-alone systems application. The converters architecture is composed by a battery charge controller, a step-up converter based on three-state switching cell, and a voltage source inverter (VSI). All of them operate with pulse width modulation (PWM) technique. The battery charge controller is a classic boost converter that operates in continuous conduction mode (CCM) and it is used to regulate the battery bank voltage, and also to reach the maximum power point from wind turbine. The second converter is a step-up, where a secondary winding is coupled to the transformer to raise the battery voltage up to 400VDC. It also operates in CCM applying two overlapping gate signals. In order to perform the DC-AC conversion, a classical voltage source inverter operating with unipolar voltage switching technique is used. Principles of operation, as well as, experimental results of the assembled prototype are presented.