Adaptive thermal control to improve IGBT's lifetime during power fluctuation in wind power converter

摘要

Wind power converter's reliability is a key issue for wind power generation system. IGBT's handling power is fluctuating largely and rapidly for wind power fluctuation, which will cause a large junction temperature variation of IGBT. Thermal stress will affect IGBT's lifetime. The adaptive thermal control is proposed to improve IGBT's lifetime during power fluctuation. That is, different vector sequences are adopted adaptively to power fluctuation levels. Compared with normal vector sequence, the IGBT's junction temperature variation can be reduced. According to power fluctuation level and IGBT's junction temperature, the relevant vector sequence is adopted. The adaptive thermal control can relieve IGBT's thermal stress and improve its lifetime. Improving IGBT's lifetime can improve wind power converter and system's reliability. The Matlab/Plecs simulation is carried out. Simulation results indicate feasibility and advantages of the adaptive thermal control.