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Design and Implementation of a Three Phase Regenerative Programmable AC Current Source

Mohammad Ali Rezaei, Payam | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54874 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Zolghadri, Mohammad Reza
  7. Abstract:
  8. A grid simulator is a system for testing various types of grid-connected devices, such as inverters of renewable energy sources, chargers, power supplies, etc. In this project, the design and implementation of a 3 KVA three-phase regenerative programmable AC current source is presented. In the future, this structure can be used as a grid simulator. The topology used for the current source is a two-level three-phase AC to DC converter. The current source can operate in constant current (CC), constant power (CP), constant impedance (CI), and constant voltage (CV) modes. In the constant current operating mode, the user sets the amplitude and phase of the 1st, 5th, 7th, 11th, and 13th harmonics of the input current, and the desired current is created at the input. In the constant power operating mode, the user sets the active and reactive power of the input, and the input current is controlled in such a way that the active and reactive power of the input is equal to the desired values. In the constant impedance operating mode, the user sets the amplitude and phase of the input impedance, and the input current is controlled in such a way that the ratio of voltage to input current is equal to the desired impedance. In the constant voltage operating mode, the control system switches from the current control mode to the voltage control mode. In this case, the user sets the amplitude and frequency of the voltage, and the output voltage is controlled in such a way that the amplitude and frequency of the output voltage are equal to the desired values. Proportional-Resonant (PR) controller is used to control the current and voltage of the programmable current source. To regenerate the received power by the current source, a back-to-back grid-connected inverter is used with the programmable current source and delivers the received power to the grid with unity power factor and acceptable THD. In addition to simulations in various conditions in Matlab/Simulink, a laboratory prototype is developed and tested in different conditions. The simulation and experimental results confirms the performance of the designed system.

    Keywords
  9. Keywords:
  10. Current Source ; Network Simulator ; Harmonics ; Load Emulator ; Power Recycle

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