Common-Mode and Differential-Mode Active Damping for PWM Rectifiers

Hedayati, Mohammad H and Acharya, Anirudh B and John, Vinod (2014) Common-Mode and Differential-Mode Active Damping for PWM Rectifiers. In: IEEE TRANSACTIONS ON POWER ELECTRONICS, 29 (6). pp. 3188-3200.

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Abstract

Modern pulse-width-modulated (PWM) rectifiers use LC L filters that can be applied in both the common mode and differential mode to obtain high-performance filtering. Interaction between the passive L and C components in the filter leads to resonance oscillations. These oscillations need to be damped either by the passive damping or active damping. The passive damping increases power loss and can reduce the effectiveness of the filter. Methods of active damping, using control strategy, are lossless while maintaining the effectiveness of the filters. In this paper, an active damping strategy is proposed to damp the oscillations in both line-to-line and line-to-ground. An approach based on pole placement by the state feedback is used to actively damp both the differential-and common-mode filter oscillations. Analytical expressions for the state-feedback controller gains are derived for both continuous and discrete-time model of the filter. Tradeoff in selection of the active damping gain on the lower order power converter harmonics is analyzed using a weighted admittance function. Experimental results on a 10-kVA laboratory prototype PWM rectifier are presented. The results validate the effectiveness of the active damping method, and the tradeoff in the settings of the damping gain.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON POWER ELECTRONICS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copyright for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, USA
Keywords:	Active damping (AD); admittance measurement; discrete-time systems; harmonic distortion; LC L filters; passive filters; pulse-width-modulated (PWM) power converters; state feedback; state-space methods
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	07 Apr 2014 07:07
Last Modified:	07 Apr 2014 07:07
URI:	http://eprints.iisc.ac.in/id/eprint/48809

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