Multilevel inverter topology using single source and double source module with reduced power electronic components

摘要

Two-level inverters are the most basic subset of multi-level inverters (MLIs). As the number of output levels increase, total harmonic distortion reduces and the performance level increases. In traditional MLI topologies, more number of power devices are involved to obtain higher order inverters which increases cost, complexity and volume. By minimising the use of power component, overall cost can be reduced. In this study, a MLI structure is proposed with minimised power components. The reduction of components are achieved through single and double source modules such as single source and single switch, single source and switch with parallel diode and double source and single switch with parallel diode. In the proposed MLI structure, the switches are reduced by half in comparison with cascaded MLI and hence the percentage in reduction of switches increase as the levels increase. For better appreciation, the proposed topology is compared with the current state of the art in MLI. This topology is modelled and simulated using LTspice and MATLAB/SIMULINK R2014 a. The prototype is designed and validated for seven and nine levels experimentally.