Current output hard-switched full-bridge DC/DC converter for wind energy conversion systems

A current output hard-switched full-bridge (HSFB) converter is presented with an intermediate high-frequency transformer as an option of a wind energy conversion system (WECS). The wind turbine simulator, based on an induction machine driving a three-phase permanent magnet synchronous generator, simulates practical wind turbine characteristics. A comparative analysis of electrical stresses on the switches of the boost converter and the current output HSFB converter is carried out at different wind speeds and maximum operational power point based on their mathematical models. The control system of the current output HSFB converter is illustrated. Then two dynamic responses of the combined mechanical and electrical systems of the WECS are investigated, under wind speed step changes. Simulation and experimental results demonstrate the feasibility and stability of a current output HSFB converter-based WECS.