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Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads

Author

Listed:
  • Daliang Yang

    (College of Electrical Engineering, Guangxi University, Nanning 530004, China)

  • Li Yin

    (College of Electrical Engineering, Guangxi University, Nanning 530004, China)

  • Shengguang Xu

    (Liuzhou Power Supply Bureau, Gxuangxi Power Grid Corporation, Liuzhou 545005, China)

  • Ning Wu

    (Electric Power Research Institute, Guangxi Power Grid Corporation, Nanning 530023, China)

Abstract

The conventional control method for a single-phase cascaded H-bridge (CHB) multilevel converter is vector ( dq ) control; however, dq control requires complicated calculations and additional time delays. This paper presents a novel power control strategy for the CHB multilevel converter. A power-based dc-link voltage balance control is also proposed for unbalanced load conditions. The new control method is designed in a virtual αβ stationary reference frame without coordinate transformation or phase-locked loop (PLL) to avoid the potential issues related to computational complexity. Because only imaginary voltage construction is needed in the proposed control method, the time delay from conventional imaginary current construction can be eliminated. The proposed method can obtain a sinusoidal grid current waveform with unity power factor. Compared with the conventional dq control method, the power control strategy possesses the advantage of a fast dynamic response. The stability of the closed-loop system with the dc-link voltage balance controller is evaluated. Simulation and experimental results are presented to verify the accuracy of the proposed power and voltage control method.

Suggested Citation

  • Daliang Yang & Li Yin & Shengguang Xu & Ning Wu, 2018. "Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads," Energies, MDPI, vol. 11(9), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2435-:d:169740
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    References listed on IDEAS

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    4. Jing Liu & Zhigang Liu, 2017. "Harmonic Analyzing of the Double PWM Converter in DFIG Based on Mathematical Model," Energies, MDPI, vol. 10(12), pages 1-19, December.
    5. Yunlu Li & Junyou Yang & Haixin Wang & Weichun Ge & Yiming Ma, 2018. "A Hybrid Filtering Technique-Based PLL Targeting Fast and Robust Tracking Performance under Distorted Grid Conditions," Energies, MDPI, vol. 11(4), pages 1-18, April.
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    Cited by:

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    4. Jin Zhu & Tongzhen Wei & Qunhai Huo & Jingyuan Yin, 2018. "A Full-bridge Director Switches based Multilevel Converter with DC Fault Blocking Capability and Its Predictive Control Strategy," Energies, MDPI, vol. 12(1), pages 1-22, December.
    5. Jin Zhu & Tongzhen Wei & Ming Ma & Libo Han, 2019. "Simple DC-Link Voltage Balancing Approach for Cascaded H-Bridge Rectifier with Asymmetric Parameters of Independent DC Loads," Energies, MDPI, vol. 12(9), pages 1-20, April.
    6. Richa Sharma & Purushottam Sharma & Deepak Nagaria & Abhishek Srivastava, 2022. "Active control of ripple energy in single-phase pulse width modulated rectifier," International Journal of System Assurance Engineering and Management, Springer;The Society for Reliability, Engineering Quality and Operations Management (SREQOM),India, and Division of Operation and Maintenance, Lulea University of Technology, Sweden, vol. 13(2), pages 713-720, April.
    7. Vitor Fernão Pires & Joaquim Monteiro & José Fernando Silva, 2019. "Dual 3-Phase Bridge Multilevel Inverters for AC Drives with Voltage Sag Ride-through Capability," Energies, MDPI, vol. 12(12), pages 1-18, June.

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