High Performance of Hybrid Multilevel Converter with Floating DC Link Controller Fed PMSM Drive
K.Venkateswarlu1 , Tegala. Srinivasa Rao2 and U Anjaiah3
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For the industrial applications which require the use of inverters, this is found to be a problem as an inverter consists of power semiconductor switches to control drives. To solve this problem, numerous multilevel inverter topologies have been introduced to enable the use of power semiconductor switches to convert higher power. This can be achieved by synthesizing a staircase output voltage waveform using a series of power semiconductor switches with several lower DC voltage sources such as capacitors, batteries, or renewable energy voltage sources. Here proposed hybrid multilevel inverter topology is derived from the multiple-transformer inverter topology. This front end complicates the implementation of converters that have a high number of levels. An alternative method of using lower voltage cells with floating dc links to compensate only for the voltage distortion of a neutral-point-clamped (NPC) converter is considered for active rectifier applications. The analogy between the floating HBs and the series active filters is used to develop a strategy for the harmonic compensation of the NPC output voltage and the control of the floating dc-link voltages and also reduces amount of THD in the output voltage of the multilevel inverter. The performance of the proposed hybrid multilevel inverter is verified through simulation of the proposed hybrid multilevel inverter topology and applied to PMSM drive to check the performance through MATLAB/SIMULINK Software Package.