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Common-Mode Filter Design for PWM Rectifier-Based Motor Drives

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3 Author(s)
Hedayati, M.H. ; Dept. of Electr. Eng., Indian Inst. of Sci. Bangalore, Bangalore, India ; Acharya, A.B. ; John, V.

A common-mode (CM) filter based on the LCL filter topology is proposed in this paper, which provides a parallel path for ground currents and which also restricts the magnitude of the EMI noise injected into the grid. The CM filter makes use of the components of a line to line LCL filter, which is modified to address the CM voltage with minimal additional components. This leads to a compact filtering solution. The CM voltage of an adjustable speed drive using a PWM rectifier is analyzed for this purpose. The filter design is based on the CM equivalent circuit of the drive system. The filter addresses the adverse effects of the PWM rectifier in an adjustable speed drive. Guidelines are provided on the selection of the filter components. Different variants of the filter topology are evaluated to establish the effectiveness of the proposed circuit. Experimental results based on EMI measurement on the grid side and the CM current measurement on the motor side are presented. These results validate the effectiveness of the filter.

Published in:

Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 11 )

Date of Publication:

Nov. 2013

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