Preprint Article Version 1 This version is not peer-reviewed

Elimination of Common-mode Voltage in Dual Two-level Voltage Source Inverter Fed Open-end Load using a Discontinuous SVM Technique

Version 1 : Received: 18 May 2018 / Approved: 22 May 2018 / Online: 22 May 2018 (05:11:06 CEST)

How to cite: Buarat, N.; Kumsuwan, Y. Elimination of Common-mode Voltage in Dual Two-level Voltage Source Inverter Fed Open-end Load using a Discontinuous SVM Technique. Preprints 2018, 2018050284 (doi: 10.20944/preprints201805.0284.v1). Buarat, N.; Kumsuwan, Y. Elimination of Common-mode Voltage in Dual Two-level Voltage Source Inverter Fed Open-end Load using a Discontinuous SVM Technique. Preprints 2018, 2018050284 (doi: 10.20944/preprints201805.0284.v1).

Abstract

The popular motor drive systems with a single two-level voltage source inverter (VSI) have one main problem that is the occurrence of the common-mode voltage (CMV), which is an effect of the electromagnetic interference, shaft voltage, bearing currents, leakage current. These cause the high stress, increasung temperature and early mechanical failure in machine. To overcome this problem, the technology of the dual two-level VSI fed open-end three-phase ac loads is now available to eliminate the CMV at the ac/induction motor load with the 120-degree modulation technique for controlling each inverter. In this paper, the discontinuous space vector modulation (DSVM) schemes are proposed and applied for the dual two-level VSI fed open-end load. It is based on the 120-degree modulation technique by using only 12 active voltage vectors and the 10 zero voltage vectors from the total 64 voltage vectors along with the different five-segment swicthing sequence designs with centralizing pulse width modulation technqiue in order to not only cancel the CMV in the ac load, but also reduce the switching number/switching loss of the conversion system. Among the various DSVM schemes, their performances are compared in this paper, such as the number of the switching, the step and peak value of the CMV in each inverter, and the quality of the output waveform, etc. The details of the verfication and comparison are carried out by simulation using Matlab/Simulink software.

Subject Areas

dual two-level voltage source inverter; common-mode voltage; discontinuous space vector modulation schemes; centralizing pulse width modulation; open-end load

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