无共模电压SVPWM多桥臂逆变器的拓扑结构演化与电机性能研究

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Abstract Compared with a traditional single inverter-fed permanent magnet synchronous motor (PMSM), the 3-phase open-end winding PMSM driven by single DC supply and dual inverters is benefited from more applicable voltage vectors, more flexible control method, as well as better drive performance, but suffers from the larger number of inverter legs and more complicated hardware structure. Therefore, in this paper, the drive topology of single-supply dual-inverter, i.e. six-leg inverter, with common-mode-voltage-free (CMVF) space vector pulse width modulation (SVPWM) is evolved so as to eliminate some of the inverter legs, whilst the motor performance with each evolved topology is comparatively analyzed. It is seen that the evolved topologies induce extra paths for the zero-sequence current which, however, is not actually generated due to the absence of the zero-sequence voltage under the CMVF SVPWM control. Thus, the motor performance is hardly deteriorated by the topology evolution. The proposed topology evolution not only provides a reference for the selection and design of the inverter and motor windings, but also reveals the innate character of the CMVF SVPWM.

Key words： Multi-leg inverter space vector pulse width modulation common-mode-voltage-free topology evolution

Received: 01 April 2015 Published: 12 July 2016

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TM351

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