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Extended Operating Region Algorithm for PV Array Connected to Microgrids for Wide Frequency and Amplitude Variations

Author

Listed:
  • Matías Garbarino

    (Department of Electrical Engineering, Universidad de Concepción, Concepción 4070386, Chile)

  • Jaime Rohten

    (Department of Electrical and Electronic Engineering, Universidad del Bío-Bío, Concepción 4051381, Chile)

  • Rodrigo Morales

    (Department of Electrical Engineering, Universidad de Concepción, Concepción 4070386, Chile)

  • José Espinoza

    (Department of Electrical Engineering, Universidad de Concepción, Concepción 4070386, Chile)

  • Javier Muñoz

    (Department of Electrical Engineering, Universidad de Talca, Curicó 3340000, Chile)

  • José Silva

    (Department of Engineering Science, Universidad de los Lagos Concepción, Avenida Alberto Hertha Fuchslocher 1305, Osorno 5290000, Chile)

  • David Dewar

    (Department of Electrical and Electronic Engineering, University of Nottingham, Nottingham NG7 2RD, UK)

Abstract

The employment of microgrids and distributed power generation have exponentially increased over recent decades, due in part to the increased inclusion of renewable energies as these technologies become cheaper to install. However, microgrids are highly sensitive to power variation, leading to distortion of the grid voltage (amplitude and frequency changes) which could destabilize the entire microgrid under variation of loads and/or other power sources. In this context, a new control strategy is proposed for a photovoltaic grid connected system, operating under voltage variations typical of a low inertial electric power network. The main problem related to voltage fluctuation is that the variables may take the power converter out of the operating region, and therefore, all controllers, including the maximum power point tracking, will not work as designed. The analysis, based on the mathematical operating region, demonstrates that the control strategy can include overmodulation compensation—to overcome problems related to weak microgrids and systems variations—through the addition of smart power factor imposition and DC-link voltage variation in transient time when the variables are far from the nominal values. The proposal is validated through simulation in PSim ® /Matlab ® and implementation on a laboratory prototype, showing the feasibility of the designed algorithm.

Suggested Citation

  • Matías Garbarino & Jaime Rohten & Rodrigo Morales & José Espinoza & Javier Muñoz & José Silva & David Dewar, 2023. "Extended Operating Region Algorithm for PV Array Connected to Microgrids for Wide Frequency and Amplitude Variations," Energies, MDPI, vol. 16(7), pages 1-22, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:7:p:3157-:d:1112600
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    References listed on IDEAS

    as
    1. Ahmed Ismail M. Ali & Zuhair Muhammed Alaas & Mahmoud A. Sayed & Abdulaziz Almalaq & Anouar Farah & Mohamed A. Mohamed, 2022. "An Efficient MPPT Technique-Based Single-Stage Incremental Conductance for Integrated PV Systems Considering Flyback Central-Type PV Inverter," Sustainability, MDPI, vol. 14(19), pages 1-15, September.
    2. Doaa Khodair & Saad Motahhir & Hazem H. Mostafa & Ahmed Shaker & Hossam Abd El Munim & Mohamed Abouelatta & Ahmed Saeed, 2023. "Modeling and Simulation of Modified MPPT Techniques under Varying Operating Climatic Conditions," Energies, MDPI, vol. 16(1), pages 1-20, January.
    3. Jin Zhou & Shanhu Li & Jianning Zhang & Tianrui Fang & Xiuyun Zhang, 2022. "Research on Space Vector Overmodulation Technology of Two-Level PWM Converters," Energies, MDPI, vol. 15(19), pages 1-17, September.
    4. Zhixun Ma & Haichuan Niu & Xiang Wu & Xu Zhang & Guobin Lin, 2022. "An Improved Overmodulation Strategy for a Three-Level NPC Inverter Considering Neutral-Point Voltage Balance and Common-Mode Voltage Suppression," Sustainability, MDPI, vol. 14(19), pages 1-16, October.
    5. Saleh Masoud Abdallah Altbawi & Ahmad Safawi Bin Mokhtar & Saifulnizam Bin Abdul Khalid & Nusrat Husain & Ashraf Yahya & Syed Aqeel Haider & Rayan Hamza Alsisi & Lubna Moin, 2023. "Optimal Control of a Single-Stage Modular PV-Grid-Driven System Using a Gradient Optimization Algorithm," Energies, MDPI, vol. 16(3), pages 1-23, February.
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