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Design and Construction of 8 Kilowatt-hour Battery Bank Connected to the Grid in order to Reduce the Peak Load

Tavassoti, Hamid Reza | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55662 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Rajabi Ghahnavieh, Abbas; Moeini Aghtaie, Moein
  7. Abstract:
  8. With the increase of electric energy demand, one of the human concerns is to create the infrastructure for the production and transmission of energy in order to meet this need. Since the network must have the ability to supply the load during the peak load times, practically during the non-peak load times, many production capacities remain unused and their productivity decreases. One of the ways to reduce this problem due to the increase in penetration of batteries in the network can be the participation of battery banks to inject power into the network during peak load times. The goal of this project is to develop an 8 kilowatt-hour battery bank system that can inject 2 kilowatts of power into the grid for 4 hours. The participation of batteries requires the use of inverters connected to the network as an interface between the battery and the network, and the goal of this project is to design this converter with a nominal power of 2 kW. This converter must have standards including creating a controlled injection current with low distortion. The power section of the inverter presented in this project has a full-bridge structure. Also, its control section includes a phase lock loop to follow the grid phase and a proportional-resonance current control loop to control the current injected into the network, all of which are implemented on the DSP-TMS320F2812 processor. Finally, an LCL filter is placed at the output of the inverter to reduce current distortion. In order to check the performance of the inverter connected to the grid, the power and control section has been simulated by MATLAB software and a sample 500-watt inverter has been manufactured. The results show that the system works well and the phase control loop follows the network phase with an error of less than 2 degrees, and the current controller shows proper behavior.
  9. Keywords:
  10. Grid Connected Inverter ; Phase Locked Loop (PLL) ; Proportional-Resonance (PR)Controller ; Injection Current ; LCL Filter ; Pulse Width Modulation (PWM)

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