Thyristor Rectifier for Permanent Magnet Wind Generators

This paper reports on an investigation to improve efficiency in a wind turbine's generator-side converter. A thyristor phase-controlled rectifier is considered as replacement for the forced-commutated voltage-source converter, universally adapted in full-conversion wind turbines with permanent-magnet generators. The paper defines power capability vs generator speed and dc-link voltage level, with an accompanying closed-loop control scheme. The point design of generator and rectifier is presented. Power loss analysis shows a fair improvement of the power conversion efficiency. The paper discusses pros and cons of the particular rectifier application.