Ming-Yan Wang

In this paper, a novel flying-capacitor-half-bridge 5-level inverter is studied which is composed of a half-bridge capacitor-clamp inverter and a conventional half-bridge inverter connected to a common split-capacitor power supply. Analysis of a modulation technique for the inverter, which incorporates square-wave synthesis in conjunction with the PWM subharmonic method, is illustrated. According to the proposed control technique, new configuration permits faster devices and higher voltage devices operating together. In order to estimate spectra accurately, the mathematic models of the modulation process with three carrier dispositions will be built, at the same time rigorous analytic solution of spectra is derived from an extension of Bennet's method. We illustrate and sum up spectral feature of output waveform covering all operation conditions. In order to verify the proposed approach simulation validation is carried out.

A novel hybrid flying-capacitor-half-bridge cascade inverter is developed in this paper. The novel inverter is based on connection of multiple single-phase flying-capacitor-half-bridge (FCH) 5-level inverter modules per phase. With the dc bus voltage ratio V1:V2=1 :2, the phase voltage of the novel inverter with two modules per phase will output 13 voltage levels. A new hybrid FCH modulation control technique for the inverter is proposed. Spectral analysis of the phase output voltage is carried out. According to the spectral analysis, there is no real power exchange between modules in a phase leg. A two-module three-phase inverter was verified by simulation. Simulation results are presented as well as comparison with hybrid capacitor-clamp cascade multilevel converter is given.

Use of multilevel converter has become popular in recent years. This paper presents a new topology of a hybrid capacitor-clamp cascade multilevel converter that is derived from two popular topologies. The new concept of the converter is based on the connection of multiple three-level capacitor-clamp converter modules with different DC bus voltages. With the novel topology consisting of higher voltage modules and lower voltage modules, realization of multilevel converters using a hybrid approach involving higher voltage devices and faster devices operating in synergism is possible. A detailed example of HCCMC is given. The proposed converter is also verified by computer simulation using MATLAB-Simulink. Simulation results are also presented in this paper

Use of multilevel converter has become popular in recent years. This paper will present a new topology of capacitor-clamp cascade multilevel converter that is derived from two popular topologies. The new concept of the novel capacitor-clamp cascade converter is based on the connection of multiple three-level capacitor-clamp converter modules. Nine level waveform of the proposed multilevel converter is synthesized by adding of each converter output voltage. Sub-harmonic PWM method is employed in the new topology. The proposed converter is also verified by computer simulation using MATLAB-Simulink. Simulation results are also presented in this paper

This paper proposed a novel hybrid flying-capacitor-half-bridge 9-level inverter in which flying-capacitor-half-bridge 5-level inverter and an H-bridge inverter with equal dc bus voltage are series connected to form an inverter phase leg. A new hybrid FCH control technique for the novel inverter is proposed. Spectral analysis of output waveform is carried out. The proposed converter is also verified by simulation using MATLAB-Simulink. Simulation results are also presented in this paper