Common-Mode Injection PWM for Parallel Converters

Prasad, Siva JS and Ghosh, Rajesh and Narayanan, G (2015) Common-Mode Injection PWM for Parallel Converters. In: IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 62 (2). pp. 789-794.

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Abstract

The ac-side terminal voltages of parallel-connected converters are different if the line reactive drops of the individual converters are different. This could result either from differences in per-phase inductances or from differences in the line currents of the converters. In such cases, the modulating signals are different for the converters. Hence, the common-mode (CM) voltages for the converters, injected by conventional space vector pulsewidth modulation (CSVPWM) to increase dc-bus utilization, are different. Consequently, significant low-frequency zero-sequence circulating currents result. This paper proposes a new modulation method for parallel-connected converters with unequal terminal voltages. This method does not cause low-frequency zero-sequence circulating currents and is comparable with CSVPWM in terms of dc-bus utilization and device power loss. Experimental results are presented at a power level of 150 kVA from a circulating-power test setup, where the differences in converter terminal voltages are quite significant.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords:	Circulating current; common-mode (CM) injection; dc-bus utilization; device loss; parallel converters; pulsewidth modulation; space vector modulation
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	01 Apr 2015 12:10
Last Modified:	01 Apr 2015 12:10
URI:	http://eprints.iisc.ac.in/id/eprint/51139

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