Open‐phase fault tolerant driving operation of dual‐inverter‐based traction drive

Abstract

A method for achieving open-phase fault tolerant operation of a dual-inverter-based traction drive with charging capability is presented. This method utilises a contactor to connect the switching nodes of the two half bridges which are normally used for AC charging in this dual inverter configuration. These half bridges are then modulated to provide a path for zero-sequence current and enhance the available voltage vector space of the drive by injecting a controllable common-mode voltage between the two inverters. A control method and five-level modulator based on zero-sequence voltage control and phase shifted carriers are introduced to accommodate this novel remedial method. Using this approach, the open-phase faulted dual inverter drive is able to operate with twice the speed range of the conventional open-phase fault tolerant approach, which is to provide a path for zero-sequence current by connecting the negative DC rails of the two inverters with a contactor. Simulation and experimental results with a prototype dual inverter drive are presented to validate the theory of the new control and modulation method. The experimental results showcase the proposed algorithms performance by dynamically responding to an open-phase fault and starting from standstill, thereby proving its validity for an electric vehicle application. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Modulation Techniques and Coordinated Voltage Vector Distribution: Effects on Efficiency in Dual-Inverter Topology-Based Electric Drives

“…In the context of modern electric vehicles and aircraft, crucial aspects include battery voltage utilization, overall drive efficiency, fault-tolerant operation, and the volume and weight of the converter [10][11][12]. For these means of transport, the dual-inverter topology (DI), as proposed by Stemmler and Guggenbach [13], emerges as a viable option due to its superior DC-bus voltage utilization and fault-tolerance capabilities [14,15].…”

Contribuições à mitigação ativa de ondulações de torque em acionamentos com máquinas síncronas de ímã permanente não senoidais

“…A presença de falha pode ser fonte de ondulações de torque: 5.1. Falta de fase do conversor [102] -falhas nas chaves de potência do conversor ou nos circuitos de acionamento das chaves podem provocar a descontinuidade de circulação de corrente em uma ou mais fases da máquina. Esse desequilíbrio resultará em significativas ondulações de torque.…”