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Control Strategy for a Grid-Connected Inverter under Unbalanced Network Conditions—A Disturbance Observer-Based Decoupled Current Approach

Author

Listed:
  • Emre Ozsoy

    (Department of Electrical and Electronics Engineering, University of Johannesburg, Auckland Park 2006, South Africa)

  • Sanjeevikumar Padmanaban

    (Department of Electrical and Electronics Engineering, University of Johannesburg, Auckland Park 2006, South Africa)

  • Lucian Mihet-Popa

    (Faculty of Engineering, Østfold University College, Kobberslagerstredet 5, 1671 Krakeroy-Fredrikstad, Norway)

  • Viliam Fedák

    (Department of Electrical Engineering & Mechatronics, Technical University of Kosice, Rampová 1731/7, 040 01 Košice, Džung’a-Džung’a, Slovakia)

  • Fiaz Ahmad

    (Mechatronics Engineering, Faculty of Engineering and Natural Sciences, Sabancı University, Istanbul 34956, Turkey)

  • Rasool Akhtar

    (Mechatronics Engineering, Faculty of Engineering and Natural Sciences, Sabancı University, Istanbul 34956, Turkey)

  • Asif Sabanovic

    (Mechatronics Engineering, Faculty of Engineering and Natural Sciences, Sabancı University, Istanbul 34956, Turkey)

Abstract

This paper proposes a new approach on the novel current control strategy for grid-tied voltage-source inverters (VSIs) with circumstances of asymmetrical voltage conditions. A standard grid-connected inverter (GCI) allows the degree of freedom to integrate the renewable energy system to enhance the penetration of total utility power. However, restrictive grid codes require that renewable sources connected to the grid must support stability of the grid under grid faults. Conventional synchronously rotating frame dq current controllers are insufficient under grid faults due to the low bandwidth of proportional-integral (PI) controllers. Hence, this work proposes a proportional current controller with a first-order low-pass filter disturbance observer (DOb). The proposed controller establishes independent control on positive, as well as negative, sequence current components under asymmetrical grid voltage conditions. The approach is independent of parametric component values, as it estimates nonlinear feed-forward terms with the low-pass filter DOb. A numerical simulation model of the overall power system was implemented in a MATLAB/Simulink (2014B, MathWorks, Natick, MA, USA). Further, particular results show that double-frequency active power oscillations are suppressed by injecting appropriate negative-sequence currents. Moreover, a set of simulation results provided in the article matches the developed theoretical background for its feasibility.

Suggested Citation

  • Emre Ozsoy & Sanjeevikumar Padmanaban & Lucian Mihet-Popa & Viliam Fedák & Fiaz Ahmad & Rasool Akhtar & Asif Sabanovic, 2017. "Control Strategy for a Grid-Connected Inverter under Unbalanced Network Conditions—A Disturbance Observer-Based Decoupled Current Approach," Energies, MDPI, vol. 10(7), pages 1-17, July.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:7:p:1067-:d:105605
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    References listed on IDEAS

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    1. Kalaivani Chandramohan & Sanjeevikumar Padmanaban & Rajambal Kalyanasundaram & Mahajan Sagar Bhaskar & Lucian Mihet-Popa, 2017. "Grid Synchronization of a Seven-Phase Wind Electric Generator Using d-q PLL," Energies, MDPI, vol. 10(7), pages 1-20, July.
    2. Das, Vipin & Padmanaban, Sanjeevikumar & Venkitusamy, Karthikeyan & Selvamuthukumaran, Rajasekar & Blaabjerg, Frede & Siano, Pierluigi, 2017. "Recent advances and challenges of fuel cell based power system architectures and control – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 10-18.
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    Citations

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    Cited by:

    1. Gabriel Nicolae Popa & Angela Iagăr & Corina Maria Diniș, 2020. "Considerations on Current and Voltage Unbalance of Nonlinear Loads in Residential and Educational Sectors," Energies, MDPI, vol. 14(1), pages 1-29, December.
    2. Sergio Saponara & Lucian Mihet-Popa, 2019. "Energy Storage Systems and Power Conversion Electronics for E-Transportation and Smart Grid," Energies, MDPI, vol. 12(4), pages 1-9, February.
    3. Igor Rodrigues de Oliveira & Fernando Lessa Tofoli & Victor Flores Mendes, 2022. "Thermal Analysis of Power Converters for DFIG-Based Wind Energy Conversion Systems during Voltage Sags," Energies, MDPI, vol. 15(9), pages 1-21, April.
    4. Taufik Taluo & Leposava Ristić & Milutin Jovanović, 2021. "Dynamic Modeling and Control of BDFRG under Unbalanced Grid Conditions," Energies, MDPI, vol. 14(14), pages 1-22, July.
    5. Mohammed Kh. AL-Nussairi & Ramazan Bayindir & Sanjeevikumar Padmanaban & Lucian Mihet-Popa & Pierluigi Siano, 2017. "Constant Power Loads (CPL) with Microgrids: Problem Definition, Stability Analysis and Compensation Techniques," Energies, MDPI, vol. 10(10), pages 1-20, October.
    6. Ramji Tiwari & Sanjeevikumar Padmanaban & Ramesh Babu Neelakandan, 2017. "Coordinated Control Strategies for a Permanent Magnet Synchronous Generator Based Wind Energy Conversion System," Energies, MDPI, vol. 10(10), pages 1-17, September.
    7. Boris Dumnic & Bane Popadic & Dragan Milicevic & Nikola Vukajlovic & Marko Delimar, 2019. "Control Strategy for a Grid Connected Converter in Active Unbalanced Distribution Systems," Energies, MDPI, vol. 12(7), pages 1-18, April.
    8. Eklas Hossain & Ron Perez & Sanjeevikumar Padmanaban & Pierluigi Siano, 2017. "Investigation on the Development of a Sliding Mode Controller for Constant Power Loads in Microgrids," Energies, MDPI, vol. 10(8), pages 1-24, July.

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