Seok-Min Kim, June-Seok Lee, and Kyo-Beum Lee, "Fault-Tolerant Strategy using Neutral-Shift Method for Cascaded Multilevel Inverters Based on Level-Shifted PWM," in Proc. ICPE (ECCE-Asia) Conf., Jun. 2015, pp. 1327–1332. > Paper

Most proposed methods for a fault-tolerant operation in many of studies are based on a phase-shifted PWM (PS-PWM) method.

However these methods are not applied directly to multilevel inverter systems using a level-shifted PWM (LS-PWM). This paper

focuses on fault-tolerant operation for a cascaded multilevel inverter based on LS-PWM. During the occurrence of a single-inverter-

cell fault, reconfiguration of the carrier bands scheme is implemented and modulation assignment of inverter cells is modified in this

proposed fault-tolerant operation. It is possible to generate balanced three-phase line-to-line voltages and line currents with the

proposed strategy when a device failure occurs in cascaded multilevel inverters using LS-PWM. The feasibility of the proposed  ​

method is proved by simulation results.