Fault-Tolerant Control of Dual Three-phase PMSM Drives Fed by T-type Three-level Inverters

In this paper, a deadbeat predictive current control based fault-tolerant control scheme is proposed for T-type three-level inverter fed dual three-phase PMSM, which aims at providing a solution for the application of high power rating, high control precision, low switching frequency, and high reliability. Firstly, deadbeat control is combined with current prediction to obtain precise voltage reference for the current control. Each three-phase three-level inverter generates a single optimal inverter voltage vector based on a new division method of space vector diagram. In this way, both low switch frequency and high control precision can be guaranteed in a high-power motor system. Secondly, fault-tolerant control schemes are designed for three types of common electric faults in T-type three-level inverter fed dual three-phase PMSM without changing the mathematical model and control framework. Thus, the complexity of the proposed fault-tolerant control schemes can be avoided and smooth transition can be guaranteed. The validity of the proposed schemes is verified by simulations.