Abstract
A three-phase multilevel inverter topology for use in various applications is proposed. The present topology introduces a combination of a cascaded H-bridge multilevel inverter with a cascaded three-phase voltage source inverter (three-phase triple voltage source inverter (TVSI)). This combination will increase the number of voltage levels generated when using fewer components compared with the conventional multilevel inverter topologies for the same voltage levels generated. The other advantage gained from the proposed configuration is the assurance of a continuous power supply to the grid in case of failure in one part of the proposed configuration. In addition, the voltage stresses on switches are reduced by half compared if each part in the proposed topology is working independently. The comparison of the proposed topology with some conventional multilevel inverter topologies is presented. The proposed topology is built in the SIMULINK environment and is simulated under various loads in addition to being connected to the grid. Phase-shifted pulse width modulation technique is used to generate the required switching pulses to drive the switches of the proposed topology. The inverter is experimentally implemented in the lab, and the switching pulses are generated with the help of MicroLabBox produced by dSPACE (digital signal processing and control engineering) company. The simulation and experimental results and their comparisons are presented to verify the proposed topology’s effectiveness and reliability.
Highlights
The term “multilevel” began when Nabae performed the three-level converter in 1981
The proposed topology is built in the SIMULINK environment (2016a, MathWorks), is simulated under various loads, and is connected to the grid
The open-end winding transformer has gained advantages to the multilevel inverter (MLI) topologies: (1) The voltage rating of the power devices is reduced by half; (2) the size of the capacitors is reduced; and (3) the Direct Current (DC) bus magnitude that the PV modules provide can be reduced by half compared with if only one part is used
Summary
The term “multilevel” began when Nabae performed the three-level converter in 1981. In this study, a three-level neutral point clamp (NPC) was proposed [1]. These topologies are not reliable, because they are based on a two-level three-leg inverter. Another type of cascaded MLI topology is based on the conventional two-level voltage source inverter It has been used in many motor-drive applications as shown in Figure 4 [23,24].
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