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Implementation of Improved Double Flying Capacitor Multicell Converter Based On Phase Shifted Carrier PWM Modulation

Sri Ganga Devi, Mrs. A. Vasanthi

Emerging Multicell Converters are very interesting alternatives for industrial applications. Here, an improved configuration of Double Flying Capacitor Multicell Converter (I-DFCM) is proposed. The major advantages of proposed converter is increasing the number of output levels with reduced number of switches and flying capacitors. The conventional configuration of DFCM converter is modified by additionally adding four low power switches and one minor dc voltage source. Added minor voltage source having a small fraction of voltage rating with main dc-link voltage rating to achieve 27-levels of output voltage. The proposed converter is controlled by a phase shifted carrier pulse width modulation technique. Simulation results are presented to validate the effectiveness of proposed I-DFCM converter. Furthermore, switching losses and total harmonic distortion are reduced. The functionality verification of the proposed 27 level I-DFCM converter with reduced number of switches is done using MATLAB/SIMULINK software.