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Evaluation of Voltage Stability in Microgrid-Tied Photovoltaic Systems

Author

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  • Plamen Stanchev

    (Department of Information Technology in Industry, Technical University of Sofia, 1000 Sofia, Bulgaria)

  • Gergana Vacheva

    (Department of Power Electronics, Technical University of Sofia, 1000 Sofia, Bulgaria)

  • Nikolay Hinov

    (Department of Power Electronics, Technical University of Sofia, 1000 Sofia, Bulgaria)

Abstract

These days, with the significant increase in the use of renewable energy sources as additional energy sources connected to the distribution network, many challenges and difficulties arise in ensuring sustainability and reliability. The generation, transmission and distribution, in the current state of the electricity system, are facing quite dynamic changes. They are the result of the liberalization of the energy market, the increased use of renewable energy sources such as photovoltaic systems, wind turbines and the charging stations for hybrid and electric vehicles. The most important factors are related to the balancing of the energy system, the analysis of voltage stability, overcoming the consequences of the increase in short-circuit currents, increasing the transmission capacities of the system forming and distribution networks, as well as the accurate forecasting of the development of loads and consumption over the coming years. This article presents an analysis of the voltage stability in a smart microgrid for two different scenarios. The studied cases describe a linear low-voltage p-type microgrid with loads connected to it at different nodes. Data on the type and cross-section of the conductors of the studied power line are presented. Simulation studies were carried out to determine the limits of grid voltage stability when connecting photovoltaic plants with a set power. The simulation results are commented on and an analysis of the optimal operating mode of the system is realized. The model studies were implemented in the NEPLAN program environment. The research carried out allows an evaluation of the permissible limits for network stability when connecting photovoltaic plants. Through this evaluation, it can be determined how many and at which node the loads should be connected without causing an imbalance in the network. This is useful from the point of view of ensuring the sustainability and reliability of electrical energy in a microgrid.

Suggested Citation

  • Plamen Stanchev & Gergana Vacheva & Nikolay Hinov, 2023. "Evaluation of Voltage Stability in Microgrid-Tied Photovoltaic Systems," Energies, MDPI, vol. 16(13), pages 1-20, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:13:p:4895-:d:1177479
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    References listed on IDEAS

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    1. Amr Saleh & Hany M. Hasanien & Rania A. Turky & Balgynbek Turdybek & Mohammed Alharbi & Francisco Jurado & Walid A. Omran, 2023. "Optimal Model Predictive Control for Virtual Inertia Control of Autonomous Microgrids," Sustainability, MDPI, vol. 15(6), pages 1-25, March.
    2. Hammad Alnuman, 2022. "Small Signal Stability Analysis of a Microgrid in Grid-Connected Mode," Sustainability, MDPI, vol. 14(15), pages 1-15, July.
    3. Leijiao Ge & Tianshuo Du & Changlu Li & Yuanliang Li & Jun Yan & Muhammad Umer Rafiq, 2022. "Virtual Collection for Distributed Photovoltaic Data: Challenges, Methodologies, and Applications," Energies, MDPI, vol. 15(23), pages 1-24, November.
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    1. Hafize Nurgul Durmus Senyapar & Ramazan Bayindir, 2023. "The Research Agenda on Smart Grids: Foresights for Social Acceptance," Energies, MDPI, vol. 16(18), pages 1-31, September.

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