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Voltage Support under Grid Faults with Inherent Current Limitation for Three-Phase Droop-Controlled Inverters

Author

Listed:
  • Alexandros G. Paspatis

    (Department of Automatic Control and Systems Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK)

  • George C. Konstantopoulos

    (Department of Automatic Control and Systems Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK)

Abstract

A novel nonlinear current-limiting controller for three-phase grid-tied droop-controlled inverters that is capable of offering voltage support during balanced and unbalanced grid voltage drops is proposed in this paper. The proposed controller introduces a unified structure under both normal and abnormal grid conditions operating as a droop controller or following the recent fault-ride-through requirement to provide voltage support. In the case of unbalanced faults, the inverter can further inject or absorb the required negative sequence real and reactive power to eliminate the negative sequence voltage at the point of common coupling (PCC) whilst ensuring at all times boundedness for the grid current. To accomplish this task, a novel and easily implementable method for dividing the available current into the two sequences (positive and negative) is proposed, suitably adapting the proposed controller parameters. Furthermore, nonlinear input-to-state stability theory is used to guarantee that the total grid current remains limited below its given maximum value under both normal and abnormal grid conditions. Asymptotic stability for any equilibrium point of the closed-loop system in the bounded operating range is also analytically proven for first time using interconnected-systems stability analysis irrespective of the system parameters. The proposed control concept is verified using an OPAL-RT real-time digital simulation system for a three-phase inverter connected to the grid.

Suggested Citation

  • Alexandros G. Paspatis & George C. Konstantopoulos, 2019. "Voltage Support under Grid Faults with Inherent Current Limitation for Three-Phase Droop-Controlled Inverters," Energies, MDPI, vol. 12(6), pages 1-20, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:6:p:997-:d:213923
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    References listed on IDEAS

    as
    1. Miguel Garnica & Luís García de Vicuña & Jaume Miret & Antonio Camacho & Ramón Guzmán, 2018. "Voltage Support Experimental Analysis of a Low-Voltage Ride-Through Strategy Applied to Grid-Connected Distributed Inverters," Energies, MDPI, vol. 11(8), pages 1-20, July.
    2. Yuanyuan Sun & Peixin Li & Shurong Li & Linghan Zhang, 2017. "Contribution Determination for Multiple Unbalanced Sources at the Point of Common Coupling," Energies, MDPI, vol. 10(2), pages 1-17, February.
    3. Antonio Camacho & Miguel Castilla & Franco Canziani & Carlos Moreira & Paulo Coelho & Mario Gomes & Pedro E. Mercado, 2017. "Performance Comparison of Grid-Faulty Control Schemes for Inverter-Based Industrial Microgrids," Energies, MDPI, vol. 10(12), pages 1-25, December.
    4. Jiawei Chen & Shuaicheng Hou & Xiang Li, 2018. "Decentralized Circulating Currents Suppression for Paralleled Inverters in Microgrids Using Adaptive Virtual Inductances," Energies, MDPI, vol. 11(7), pages 1-16, July.
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    Cited by:

    1. Chien-Chang Wu & Tsung-Lin Chen, 2020. "Design and Experiment of a Power Sharing Control Circuit for Parallel Fuel Cell Modules," Energies, MDPI, vol. 13(11), pages 1-23, June.
    2. Markel Zubiaga & Carmen Cardozo & Thibault Prevost & Alain Sanchez-Ruiz & Eneko Olea & Pedro Izurza & Siam Hasan Khan & Joseba Arza, 2021. "Enhanced TVI for Grid Forming VSC under Unbalanced Faults," Energies, MDPI, vol. 14(19), pages 1-19, September.
    3. George C. Konstantopoulos & Antonio T. Alexandridis & Panos C. Papageorgiou, 2020. "Towards the Integration of Modern Power Systems into a Cyber–Physical Framework," Energies, MDPI, vol. 13(9), pages 1-20, May.
    4. Li Sun & Hongbo Liu & Chenglian Ma, 2020. "AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures," Energies, MDPI, vol. 13(5), pages 1-14, March.
    5. Antonio T. Alexandridis, 2020. "Modern Power System Dynamics, Stability and Control," Energies, MDPI, vol. 13(15), pages 1-8, July.

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