Journal of Power Electronics

  • 제12권5호
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  • Pages.739-747
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  • 2012
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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Leg-Balancing Control of the DC-link Voltage for Modular Multilevel Converters

  • Du, Sixing (State Key Lab of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Liu, Jinjun (State Key Lab of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Lin, Jiliang (State Key Lab of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University)
  • 투고 : 2012.03.30
  • 발행 : 2012.09.20
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초록

This paper applies carrier phase shifted pulse-width modulation (CPS-PWM) to transformerless modular multilevel converters (MMC) to improve the output spectrum. Because the MMC topology is characterized by the double-star connection of six legs consisting of cascaded modular chopper cells with floating capacitors, the balance control of the DC-link capacitor voltage is essential for safe operation. This paper presents a leg-balancing control strategy to achieve DC-link voltage balance under all operating conditions. This strategy based on circulating current decoupling control focused on DC-link balancing between the upper and lower legs in each phase pair by considering the six legs as three independent phase-pairs. Experiments are implemented on a 100-V 3-kVA downscaled prototype. The experimental results show that the proposed leg-balancing control is both effective and practical.

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참고문헌

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피인용 문헌

  1. Analysis of the Phase-Shifted Carrier Modulation for Modular Multilevel Converters vol.30, pp.1, 2015, https://doi.org/10.1109/TPEL.2014.2299802
  2. Bi-Directional Multi-Level Converter for an Energy Storage System vol.14, pp.3, 2014, https://doi.org/10.6113/JPE.2014.14.3.499
  3. Generalized Theory of Phase-Shifted Carrier PWM for Cascaded H-Bridge Converters and Modular Multilevel Converters vol.4, pp.2, 2016, https://doi.org/10.1109/JESTPE.2015.2476699
  4. Structure for double flying capacitor multicell converter; progressive double flying capacitor multicell converter vol.8, pp.2, 2015, https://doi.org/10.1049/iet-pel.2014.0199
  5. Experimental Validation of a Cascaded Single Phase H-Bridge Inverter with a Simplified Switching Algorithm vol.14, pp.3, 2014, https://doi.org/10.6113/JPE.2014.14.3.507