Grid Integration of a Single-Source Switched-Capacitor Multilevel Inverter with Boosting Capability

Document Type : Original Article

Authors

Department of Electrical Engineering, Technical and Vocational University (TVU), Tehran, Iran

Abstract

This paper investigates the connection of a single-phase multilevel inverter structure to an existing power grid. The applied voltage source inverter is able to generate a near sinusoidal voltage waveform with an amplitude six times the input voltage by using a single DC input power supply. A proportional-resonant (PR) controller regulates the injected current into the grid while an EPLL is used to ensure the synchronization of the phase and the frequency of the output voltage with the grid. The performance of the grid-connected inverter under different loading conditions was simulated in MATLAB software. Finally, the simulation results were compared with those of the experimental ones. In addition, the behavior of the inverter in standalone operating mode, while supplying a local load, as well as its grid-tied performance with a constant and variable current reference was evaluated. The correct operation of the inverter in all operating modes, achieving 96.9% efficiency, along with the self-voltage balancing of the capacitors makes it suitable for the application of grid-integration of the low-voltage renewable energy sources.

Keywords

References

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Energy Engineering and Management
Volume 13, Issue 1
March 2023
Pages 64-73

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