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An Improved Control and Energy Management Strategy of Three-Level NPC Converter Based DC Distribution Network

Author

Listed:
  • Yuqi Wang

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Qingshan Xu

    (School of Electrical Engineering, Southeast University, Nanjing 210096, China)

  • Zhoujun Ma

    (State Grid Nanjing Supply Company, Nanjing 210008, China)

  • Hong Zhu

    (State Grid Nanjing Supply Company, Nanjing 210008, China)

Abstract

To meet the challenge of large-scale renewable energy penetration and take full advantage of existing AC infrastructure, the bipolar DC distribution system is of interest. In this article, the system structure and characteristics of the bipolar DC distribution network are proposed. The three-level Neural Point Clamped Converter (NPC) is used in the proposed system to construct the bipolar DC system. To optimize the DC system performance, an improved cooperative control and energy management strategy is proposed mainly to mitigate DC voltage fluctuation and balance the positive and negative phase voltage. The improved strategy consists of (1) 2-degree of freedom (2DOF) PID controller in traditional voltage control loop; (2) cooperative controller to take full advantage of storage system; (3) voltage equalization controller to balance two-phase voltages; and (4) the energy management system to dispatch the response job to batteries and supercapacitors. Experiments and simulations are performed to validate the effectiveness of the proposed strategy.

Suggested Citation

  • Yuqi Wang & Qingshan Xu & Zhoujun Ma & Hong Zhu, 2017. "An Improved Control and Energy Management Strategy of Three-Level NPC Converter Based DC Distribution Network," Energies, MDPI, vol. 10(10), pages 1-19, October.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:10:p:1635-:d:115502
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    References listed on IDEAS

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    1. Jongbok Baek & Wooin Choi & Suyong Chae, 2017. "Distributed Control Strategy for Autonomous Operation of Hybrid AC/DC Microgrid," Energies, MDPI, vol. 10(3), pages 1-16, March.
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    Cited by:

    1. Mahdi Shahparasti & Pedro Catalán & Nurul Fazlin Roslan & Joan Rocabert & Raúl-Santiago Muñoz-Aguilar & Alvaro Luna, 2018. "Enhanced Control for Improving the Operation of Grid-Connected Power Converters under Faulty and Saturated Conditions," Energies, MDPI, vol. 11(3), pages 1-21, February.
    2. P. Madasamy & V. Suresh Kumar & P. Sanjeevikumar & Jens Bo Holm-Nielsen & Eklas Hosain & C. Bharatiraja, 2019. "A Three-Phase Transformerless T-Type- NPC-MLI for Grid Connected PV Systems with Common-Mode Leakage Current Mitigation," Energies, MDPI, vol. 12(12), pages 1-25, June.

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