An Innovative Scheme of Symmetric Multilevel Voltage Source Inverter With Lower Number of Circuit Devices

Abstract

In this paper, an advanced configuration for symmetric multilevel voltage source inverter is proposed. The authority of the proposed inverter versus the conventional cascaded H-bridge inverter and the most recently introduced ones, is verified with provided comparisons. The proposed inverter is able to generate the desired voltage levels using a lower number of circuit devices including power semi-conductor switches and related gate driver circuits of switches. As a result, the total cost is considerably reduced and the control scheme gets simpler. Moreover, reduced amount of on-state switches in the suggested configuration decreases voltage drops. And power losses are diminished, as well. The given simulation results confirms the feasibility of the proposed configuration. Also, to approve the practicability of the proposed inverter, a prototype of the proposed topology has been implemented. Finally simulation and experimental results are compared with each other and the provided comparison shows that the obtained results are in good agreements.

A modified circuit for symmetric and asymmetric multilevel inverter with reduced components count

“…As seen from Figure 3A, the required number of switches in the proposed symmetrical inverter are lower than the conventional CHB, NPC, FC topologies, and recent topologies. The curve plotted between TSV and number of output voltage level for the proposed and contemporary topologies are shown in Figure 3C, it indicates that the TSV in the proposed symmetrical MLI is slightly higher than the conventional CHB and topologies presented in Ajami et al and Kangarlu et al, 22,23 and same as topologies in Oskuee, Salary, et al, Banaei et al,and Oskuee,Karimi,et al,18,20,28 but lower than the study in Babaei and Hosseini and Banaei and Salary. Therefore, total power loss is reduced and improved the efficiency of the inverter.…”

“…12,[18][19][20][21][22][23][24][25][26][27][28][29][30] To highlight the pros and cons of the proposed topology, separate analysis is done for symmetrical and asymmetrical MLIs. 12,[18][19][20][21][22][23][24][25][26][27][28][29][30] To highlight the pros and cons of the proposed topology, separate analysis is done for symmetrical and asymmetrical MLIs.…”

“…The proposed asymmetrical configuration is also compared with recent asymmetrical topologies [24][25][26][27][28][29][30] and conventional trinary CHB configuration. A comparison has been done with respect to the required number of switches, number of on-state switches, number of dc sources, and TSV on switches for the same number of output voltage levels.…”

Fault-tolerant operation of some reduced-device-count multilevel inverters with improved performance

“…Now, as the number of power switches is greatly reduced in RDC‐MLIs, the number of redundant states is also reduced . In some cases, the redundant states are eliminated altogether, especially in RDC‐MLIs with asymmetric input sources …”

“…Similarly, Ebrahimi et al have presented an RDC‐MLI having an H‐bridge which allows line frequency operation of high voltage rated switches but does not allow FT operation in case of open switch faults. The structure proposed in Oskuee et al is capable of generating bipolar levels and significantly reduces the power switch count but does not support operation in the case of any open‐switch failures. The topology proposed by Jayabalan et al reduces the number of switches and is modular in nature, but it cannot be reconfigured in the case of power switch faults.…”