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A comparison study of two DC microgrid controls for a fast and stable DC bus voltage

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  • Jebali Ben Ghorbal, Manel
  • Moussa, Sonia
  • Arbi Ziani, Jihen
  • Slama-Belkhodja, Ilhem

Abstract

DC microgrids are the new trend for renewable energy distributed systems due to their high efficiency and more suitability to new load appliances. However, some problems are still open to discussion as it is an emerging concept. In a DC microgrid, a very important issue consists on an enhanced control of the DC bus voltage. This control should be reliable especially towards power flow variations which can be caused by distributed generation sources or by abrupt load demand. These oscillations are also caused by special load type called Constant Power Loads (CPL) when connected to the DC bus voltage due to the negative impedance they induce between source converter and load side. To overcome the above mentioned problems, this paper investigates two internal types of control in the primary level control to ensure a constant DC bus voltage with good performances firstly when a CPL is connected and secondly when a power flow change occurs from the source side or even the load one. The first control is based on cascaded PI regulators and the second one is a nonlinear control. Both control performances are compared for different load points using PSIM software. Simulation and experimental results are presented and discussed.

Suggested Citation

  • Jebali Ben Ghorbal, Manel & Moussa, Sonia & Arbi Ziani, Jihen & Slama-Belkhodja, Ilhem, 2021. "A comparison study of two DC microgrid controls for a fast and stable DC bus voltage," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 184(C), pages 210-224.
    • Handle: RePEc:eee:matcom:v:184:y:2021:i:c:p:210-224
    DOI: 10.1016/j.matcom.2020.02.008
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    References listed on IDEAS

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    1. Ghzaiel, Walid & Jebali-Ben Ghorbal, Manel & Slama-Belkhodja, Ilhem & Guerrero, Josep M., 2017. "Grid impedance estimation based hybrid islanding detection method for AC microgrids," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 131(C), pages 142-156.
    2. Singh, Suresh & Gautam, Aditya R. & Fulwani, Deepak, 2017. "Constant power loads and their effects in DC distributed power systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 72(C), pages 407-421.
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    1. Zaid Hamid Abdulabbas Al-Tameemi & Tek Tjing Lie & Gilbert Foo & Frede Blaabjerg, 2021. "Control Strategies of DC Microgrids Cluster: A Comprehensive Review," Energies, MDPI, vol. 14(22), pages 1-34, November.
    2. Afkar, Mohammad & Gavagsaz-Ghoachani, Roghayeh & Phattanasak, Matheepot & Pierfederici, Serge, 2024. "Voltage-balancing of two controllers for a DC-DC converter-based DC microgrid with experimental verification," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 221(C), pages 159-179.
    3. Meenakshi, RM. & Selvi, K., 2024. "Iteratively Sustained Sliding Mode Control based energy management in a DC Microgrid," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 220(C), pages 673-695.

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