Research on Fault Diagnosis and Reconfiguration Strategy of Single-Phase Three-Level Cascaded Inverter

With the rapid development of power electronics equipment, multi-level inverters have attracted much attention due to their good performance, and three-level inverters are the most basic structure. Aiming at the problem of high failure rate, this paper proposes a fault diagnosis and reconfiguration strategy study for single-phase three-level cascaded inverters. By collecting bridge arm voltage and mode lock, the fault signal is output stably to realize fault diagnosis. Combined with the fault diagnosis results, setting the redundancy performance of the corresponding modules and adjusting the control modulation strategy can achieve system reconfiguration. The system still has good harmonic characteristics during fault-tolerant operation.