Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 33, Issue 8, Pages 6608-6621Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2017.2755767
Keywords
Equal frequency; low frequency; medium-voltage high-power adjustable speed drive (ASD); modular multilevel matrix converter (M3C); triple-star bridge cells converter; voltagebalancing control
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Funding
- Education Development Program of Delta Environmental and Educational Foundation [DREK2015001]
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The modular multilevel matrix converter (M3C) is a promising topology for high-voltage high-power applications. Recent researches have proved its significant advantages for adjustable-speed motor drives compared with the back-to-back modular multilevel converter. However, the branch energy balancing in the M3C presents great challenge especially at criticalfrequency points where the output frequency is close to zero or grid-side frequency. Generally, this balancing control depends on the appropriate injection of inner circulating currents and the common-mode voltage (CMV), whereas their values are hard to determine and optimize. In this paper, an optimization-based predictive control method is proposed to calculate the required circulating currents and the CMV. The proposed method features a broad frequency range balancing of capacitor voltages and no reactive power in the grid side. For operation at critical-frequency points, there is no increase on branch voltage stresses and limited increase on branch current stresses. A downscaled M3C system with 27 cells is designed and experiment results with the R-L load and induction motor load are presented to verify the proposed control method.
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