A novel hybrid multilevel inverter using DC-Link voltage combination

This paper presents a novel hybrid multilevel inverter using DC-Link voltage combination in order to improve the waveform of output voltage and reduce harmonics without an additional output filter. The proposed multilevel inverter can generate an 11-level output voltage. It employs three H-bridge cells, which is consisted of single-phase full-bridge inverter module. Among them, two modules are used for level generation, and one module performs PWM switching. Nine levels are synthesised by the level inverter, and two levels are added to outputs by the PWM inverter. As a result, it generates an 11-level. The operational principles are explained in depth, and the validity of the proposed system is verified through the experimental results based on a prototype.