A Singular Value Decomposition based Space Vector Modulation to Reduce the Output Common-Mode Voltage of Direct Matrix Converters

Abstract

Large magnitude common-mode voltage (CMV) and its variation dv/dt have an adverse effect on motor drives that leads to early winding failure and bearing deterioration. For matrix converters, the switch states that connect each output line to a different input phase result in the lowest CMV among all of the valid switch states. To reduce the output CMV for matrix converters, this paper presents a new space vector modulation (SVM) strategy by utilizing these switch states. By this mean, the peak value and the root mean square of the CMV are dramatically decreased. In comparison with the conventional SVM methods this strategy has a similar computation overhead. Experiment results are shown to validate the effectiveness of the proposed modulation method.

Geometrical visualisation of indirect space vector modulation for matrix converters operating with abnormal supplies

“…In order to reveal such transformation, the SVD technique is applied to the matrix , on account of the similar geometric operations between SVD and . This results in a set of multiplied matrices, representing as , where both and are unitary matrices, while is a diagonal matrix [36–39]. Note that the SVD technique used in this work is not for principle component analyses but to provide insights to the intrinsic properties of the SSMs of MCs and categorise them into groups, with the help of the geometrical meaning of SVD.…”

A New SVM Method to Reduce Common-Mode Voltage of Five-leg Indirect Matrix Converter Fed Open-End Load Drives

“…The IMC can offer additional benefits that are not available in the DMC such as a simpler clamp circuit for overvoltage protection, zero-current commutation, and flexible structures [10], [11]. However, both the DMC and IMC suffer from common-mode voltage (CMV) problems [12], [13]. CMV is responsible for premature motor bearing failures and electromagnetic interference.…”