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Battery Energy Storage System

  • Gonzalez, Carlos
  • Tafoya, Philip
  • Caraballo, Mariely
  • Hoang, William
Publication Date
Dec 01, 2022
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The Battery Energy Storage System (BESS) project consists of bringing an existing photovoltaic battery energy storage system into service within Cal Poly’s Energy Conversion Lab. Information regarding the BESS is limited to the existing manuals as the original equipment manufacturer has ceased supporting the product in the United States. Results from previous projects on the BESS speculated that a DC input may be required to enable the system’s to be fully operational. The goal of the project is to provide a DC input into BESS and test the system’s functionality. Initially, a Photovoltaic Thevenin Equivalent was expected to be utilized as the DC Input. Cal Poly Professor Dr. Poshtan obtained programmable DC Power Supplies that can also function as a Photovoltaic Emulator when used with the corresponding software. The programmable DC Power Supply was utilized for the DC Input into the BESS. When used as a simple DC supply, the supply provided low current into the BESS. The Power Supply when used as a PV emulator is able to provide more current. The main issue when utilizing the PV emulator connected to the BESS is that the power output would reach the maximum then continuously reset in a loop. It can be concluded that a single PV emulator was unable to provide sufficient power to successfully operate the BESS. It is believed that this looping is due to issues with the inverter’s synchronization with the power grid or a lack of sufficient power in each individual photovoltaic input. Future steps include connecting multiple power supplies to the inverter to explore the possibility of more power for each individual photovoltaic input on the inverter.

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