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Control Strategy for a Grid Connected Converter in Active Unbalanced Distribution Systems

Author

Listed:
  • Boris Dumnic

    (University of Novi Sad, Faculty of Technical Sciences, 21000 Novi Sad, Serbia)

  • Bane Popadic

    (University of Novi Sad, Faculty of Technical Sciences, 21000 Novi Sad, Serbia)

  • Dragan Milicevic

    (University of Novi Sad, Faculty of Technical Sciences, 21000 Novi Sad, Serbia)

  • Nikola Vukajlovic

    (University of Novi Sad, Faculty of Technical Sciences, 21000 Novi Sad, Serbia)

  • Marko Delimar

    (University of Zagreb, Faculty of Electrical Engineering and Computing, 10000 Zagreb, Croatia)

Abstract

The development in distributed energy resources technology has led to a significant amount of non-linear power electronics converters to be integrated in the power system. Although this leads to a more sustainable system, it also can have adverse impacts on system stability and energy power quality. More importantly, the majority of the distribution power systems currently are unbalanced (with asymmetrical voltages) due to load unbalance, while the most common fault types are unbalanced grid faults that can have many adverse effects on distributed resource operations. In that regard, proper control of the grid connected converters in active unbalanced distribution systems will become very important. This paper aims to present the behavior of the advanced grid connected converter control technique under different voltage states at the point of common coupling (according to the ABC classification). The main insufficiencies of the classical control technique will be highlighted, while the paper will propose an appropriate solution for mitigation of negative sequence currents under asymmetrical voltages at the point of common coupling. An extensive experimental verification of the proposed techniques is performed using an advanced laboratory prototype for research in grid integration of distributed resources. The experimental verification clearly demonstrates the benefits offered by the advanced control strategy.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:7:p:1362-:d:221187
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    References listed on IDEAS

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    1. 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.
    2. Thuy Vi Tran & Seung-Jin Yoon & Kyeong-Hwa Kim, 2018. "An LQR-Based Controller Design for an LCL-Filtered Grid-Connected Inverter in Discrete-Time State-Space under Distorted Grid Environment," Energies, MDPI, vol. 11(8), pages 1-28, August.
    3. Ngoc Bao Lai & Kyeong-Hwa Kim, 2016. "An Improved Current Control Strategy for a Grid-Connected Inverter under Distorted Grid Conditions," Energies, MDPI, vol. 9(3), pages 1-23, March.
    4. Weiyi Zhang & Joan Rocabert & J. Ignacio Candela & Pedro Rodriguez, 2017. "Synchronous Power Control of Grid-Connected Power Converters under Asymmetrical Grid Fault," Energies, MDPI, vol. 10(7), pages 1-21, July.
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    Cited by:

    1. Zbigniew Olczykowski, 2021. "Electric Arc Furnaces as a Cause of Current and Voltage Asymmetry," Energies, MDPI, vol. 14(16), pages 1-18, August.
    2. Bane Popadic & Boris Dumnic & Dragan Milicevic & Luka Strezoski & Natasa Petrovic, 2021. "Sub-Transient Response of the DSC Controlled Inverter under Fault," Energies, MDPI, vol. 14(16), pages 1-18, August.

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