Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 4, Pages 3245-3254Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3076727
Keywords
Capacitors; Capacitance; Voltage control; Drives; Rectifiers; Power system stability; Current measurement; Adaptive filtering; dc-link capacitor reduction; multilevel drives; regenerative; stability
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada
- Ontario Centres of Excellence
- Rockwell Automation Canada
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This article proposes a closed-loop voltage ripple controller for regenerative CHB drives, which can reduce the dc-link capacitance.
The diode-front-end cascaded H-bridge (CHB) inverters have prevailed in the nonregenerative industry drive domain for high-power medium-voltage applications. The regenerative version of the CHB drives is made possible by adding the extra active-front-end rectifier in each power cell, such as a three-phase PWM rectifier. However, due to the instantaneous power unbalance, the dc-link capacitors of the regenerative power cell need to be overdesigned to maintain a stable low ripple dc-link voltage. To reduce the dc-link capacitance, this article proposes a novel closed-loop voltage ripple controller for the regenerative CHB drive without adding extra sensors. In the proposed method, dc-link voltage ripple amplitude and phase angle are accurately detected with a high-performance adaptive filter. Moreover, a latent instability issue is discussed and is avoided in the proposed controller. The performance of the proposed control strategy is validated experimentally on a seven-level regenerative CHB drive.
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