Abstract
The use of power electronic converters is essential for the operation of Switched Reluctance Machines (SRMs). Many topologies and structures have been developed over the last years considering several specific applications for this kind of machine, improving the control strategies, performance range, fault-tolerant operation, among other aspects. Thus, due to the great importance of power electronic converters in such applications, this paper is focused on a detailed review of main structures and topologies for SRM drives. The proposed study is not limited to the classic two-level power converters topologies dedicated to the SRMs; it also presents a review about recent approaches, such as multilevel topologies and based on impedance source network. Moreover, this review is also focused on a new class of topologies associated to these machines, namely the ones with fault-tolerant capability. This new category of topologies has been a topic of research in recent years, being currently considered an area of great interest for future research work. An analysis, taking into consideration the main features of each structure and topology, was addressed in this review. A classification and comparison of the several structures and topologies for each kind of converter, considering modularity, boost capability, number of necessary switches and phases, integration in the machine design, control complexity, available voltage levels and fault-tolerant capability to different failure modes, is also presented. In this way, this review also includes a description of the presented solutions taking into consideration the reliability of the SRM drive.
Highlights
The Switched Reluctance Machine (SRM) is an electric machine characterized by operating through a reluctance torque, generated by the interaction between the salient rotor poles and the energized stator poles
This review shows that the interest in the SRM has grown over the last years and, the number of new and promising topologies and solutions increased
This work is not limited to the two-level power converter topologies, but extended to new approaches
Summary
The Switched Reluctance Machine (SRM) is an electric machine characterized by operating through a reluctance torque, generated by the interaction between the salient rotor poles and the energized stator poles. Since the design of the stator and rotor are simple, it is usually less subject to internal faults, presenting better fault-tolerant capability This aspect can be considered one of the major advantages of this machine since it continues to operate even in the presence of shorted or disabled poles, with increased torque ripple. The theoretical current waveform of each phase is rectangular rectangular and, to provide such waveforms, it is necessary to use power convertersand, abletotoprovide impose such waveforms, it is necessary to use power converters able to impose bidirectional or zero voltages bidirectional or zero voltages and control unidirectional currents in each phase. Force instead of using high DC voltage source, it is usually to usebetter a multilevel multilevel topology or an alternative topology Another important aspect that emerged emerged over the last years is the fault tolerant capability of power converters.
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