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Single-Phase Seven-Level Grid-Connected Inverter for Photovoltaic System

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3 Author(s)
Nasrudin A. Rahim ; Center of Research for Power Electronics, Drives, Automation and Control (UMPEDAC), Faculty of Engineering , University Malaya, Kuala Lumpur, Malaysia ; Krismadinata Chaniago ; Jeyraj Selvaraj

This paper proposes a single-phase seven-level inverter for grid-connected photovoltaic systems, with a novel pulsewidth-modulated (PWM) control scheme. Three reference signals that are identical to each other with an offset that is equivalent to the amplitude of the triangular carrier signal were used to generate the PWM signals. The inverter is capable of producing seven levels of output-voltage levels (Vdc, 2Vdc/3, Vdc/3, 0, -Vdc, -2Vdc/3, -Vdc/3) from the dc supply voltage. A digital proportional-integral current-control algorithm was implemented in a TMS320F2812 DSP to keep the current injected into the grid sinusoidal. The proposed system was verified through simulation and implemented in a prototype.

Published in:

IEEE Transactions on Industrial Electronics  (Volume:58 ,  Issue: 6 )