A battery-balancing seven-level inverter

In this paper, a cascaded multilevel inverter with selective harmonic elimination and battery-balanced discharge function (CMI-SHE & BBD) is proposed. The input of each level of cascaded multilevel inverter circuit is directly connected to a battery. Duty cycle of switch of each level is controlled to contain the ac output voltage with minimize total harmonic distortion. Additionally, the battery-balanced discharge function is also achieved. Finally, an equivalent model block diagram of the proposed system to verify the feasibility and advantage by using simulate software MATLAB. The simulation system results show that the proposed multilevel inverter with selective harmonic elimination and battery-balanced discharge function can eliminate harmonic and improve the cascaded battery-imbalanced problem effectively as we wanted.