Research on fault-tolerant control of three-level active power

Based on the changes in the basic vectors in the space voltage vector diagram after the failure of different power devices in active power filters, two fault-tolerant control methods are proposed. For the open-circuit fault of the power device in the vertical bridge arm, a fault-tolerant control method based on hardware topology reconstruction is adopted. The fault-tolerant control method based on vector redundancy is adopted for the open-circuit fault of the power devices in the horizontal bridge arm. The failed basic voltage vector can be replaced by redundant vectors or equivalently synthesized by adjacent basic vectors. Finally, the fault-tolerant effects of these two methods were verified through simulation.