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Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter

Author

Listed:
  • Yiqi Liu

    (College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China)

  • Danhua Li

    (Maintenance Branch Company, State Grid Chongqing Electric Power Company, Chongqing 400039, China)

  • Yu Jin

    (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China)

  • Qingbo Wang

    (College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China)

  • Wenlong Song

    (College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China)

Abstract

The average switching model of modular multilevel converter (MMC) is built in this paper when the hot reserved strategy is adopted as a fault-tolerant control. When the MMC SM faults, the rest of the SMs cannot support the DC-link voltage, which results in interruption of the inverter. To tackle this issue, a novel fault-tolerant control strategy is proposed to bypass the SM under fault and re-regulate the SM capacitor voltage and carrier phase-shift angle to maintain the main components of circulating current, and reduce the Total Harmonic Distortion (THD) of grid connected current to enable the stable operation of the photovoltaic inverter. The maximum power tracking control is improved to solve the problem of long restoration time when faults occur, based on a constant voltage startup method combined with a fix-step incremental conductance method. Simulations in MATLAB/Simulink and experimental results have verified the feasibility and effectiveness of the proposed control strategy.

Suggested Citation

  • Yiqi Liu & Danhua Li & Yu Jin & Qingbo Wang & Wenlong Song, 2018. "Research on Unbalance Fault-Tolerant Control Strategy of Modular Multilevel Photovoltaic Grid-Connected Inverter," Energies, MDPI, vol. 11(6), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1368-:d:149349
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    References listed on IDEAS

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    1. Wen Wu & Xuezhi Wu & Jingyuan Yin & Long Jing & Shuai Wang & Jinke Li, 2017. "Characteristic Analysis and Fault-Tolerant Control of Circulating Current for Modular Multilevel Converters under Sub-Module Faults," Energies, MDPI, vol. 10(11), pages 1-22, November.
    2. Wei Li & Gengyin Li & Rong Zeng & Kai Ni & Yihua Hu & Huiqing Wen, 2018. "The Fault Detection, Localization, and Tolerant Operation of Modular Multilevel Converters with an Insulated Gate Bipolar Transistor (IGBT) Open Circuit Fault," Energies, MDPI, vol. 11(4), pages 1-20, April.
    3. Majid Mehrasa & Edris Pouresmaeil & Sasan Zabihi & Juan C. Trujillo Caballero & João P. S. Catalão, 2016. "A Novel Modulation Function-Based Control of Modular Multilevel Converters for High Voltage Direct Current Transmission Systems," Energies, MDPI, vol. 9(11), pages 1-14, October.
    4. Miguel Moranchel & Emilio Bueno & Inés Sanz & Francisco J. Rodríguez, 2017. "New Approaches to Circulating Current Controllers for Modular Multilevel Converters," Energies, MDPI, vol. 10(1), pages 1-20, January.
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    Cited by:

    1. Kuei-Hsiang Chao & Chen-Hou Ke, 2020. "Fault Diagnosis and Tolerant Control of Three-Level Neutral-Point Clamped Inverters in Motor Drives," Energies, MDPI, vol. 13(23), pages 1-25, November.
    2. Qinyue Zhu & Wei Dai & Lei Guan & Xitang Tan & Zhaoyang Li & Dabo Xie, 2019. "A Fault-Tolerant Control Strategy of Modular Multilevel Converter with Sub-Module Faults Based on Neutral Point Compound Shift," Energies, MDPI, vol. 12(5), pages 1-22, March.

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