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Modelling and Control of Parallel-Connected Transformerless Inverters for Large Photovoltaic Farms

Author

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  • Marian Liberos

    (Grupo de Sistemas Electrónicos Industriales del Departamento de Ingeniería Electrónica, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain)

  • Raúl González-Medina

    (Grupo de Sistemas Electrónicos Industriales del Departamento de Ingeniería Electrónica, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain)

  • Gabriel Garcerá

    (Grupo de Sistemas Electrónicos Industriales del Departamento de Ingeniería Electrónica, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain)

  • Emilio Figueres

    (Grupo de Sistemas Electrónicos Industriales del Departamento de Ingeniería Electrónica, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain)

Abstract

This paper presents a control structure for transformerless photovoltaic inverters connected in parallel to manage photovoltaic fields in the MW range. Large photovoltaic farms are usually divided into several photovoltaic fields, each one of them managed by a centralized high power inverter. The current tendency to build up centralized inverters in the MW range is the use of several transformerless inverters connected in parallel, a topology that provokes the appearance of significant zero-sequence circulating currents among inverters. To eliminate this inconvenience, this paper proposes a control structure that avoids the appearance of circulating currents by controlling the zero-sequence component of the inverters. A second contribution of the paper is the development of a model of n parallel-connected inverters. To validate the concept, the proposed control structure has been applied to a photovoltaic field of 2 MW managed by four 500 kW photovoltaic inverters connected in parallel.

Suggested Citation

  • Marian Liberos & Raúl González-Medina & Gabriel Garcerá & Emilio Figueres, 2017. "Modelling and Control of Parallel-Connected Transformerless Inverters for Large Photovoltaic Farms," Energies, MDPI, vol. 10(8), pages 1-25, August.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:8:p:1242-:d:109126
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    References listed on IDEAS

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    1. Pazheri, F.R. & Othman, M.F. & Malik, N.H., 2014. "A review on global renewable electricity scenario," Renewable and Sustainable Energy Reviews, Elsevier, vol. 31(C), pages 835-845.
    2. Turgay Duman & Shilpa Marti & M. A. Moonem & Azas Ahmed Rifath Abdul Kader & Hariharan Krishnaswami, 2017. "A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems," Energies, MDPI, vol. 10(5), pages 1-28, May.
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    Cited by:

    1. Václav Beránek & Tomáš Olšan & Martin Libra & Vladislav Poulek & Jan Sedláček & Minh-Quan Dang & Igor I. Tyukhov, 2018. "New Monitoring System for Photovoltaic Power Plants’ Management," Energies, MDPI, vol. 11(10), pages 1-13, September.
    2. Chen Zheng & Qionglin Li & Lin Zhou & Bin Li & Mingxuan Mao, 2018. "The Interaction Stability Analysis of a Multi-Inverter System Containing Different Types of Inverters," Energies, MDPI, vol. 11(9), pages 1-17, August.

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