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Review Papers | Electrical & Electronics Engineering | India | Volume 12 Issue 2, February 2023 | Rating: 5.2 / 10
Comparison of Conventional Single Phase 21-Level Cascaded H-Bridge MLI and Single Phase 21-Level MLI with Reduced Switches and Sources and Verifying the Topology with Hardware of 7-Level MLI
Nayana Raut, Rigved Kelkar
Abstract: Multilevel Inverters are influencing many industries because of their applications in renewable energy with low switching losses, low THD and high dv/dt stress. In this paper, conventional single phase 21 level cascaded H-bridge multilevel inverter and single phase 21 level multilevel inverter with reduced switches and sources have been compared. Here, a conventional single phase 21 level cascaded H-bridge multilevel inverter and 21 level multilevel inverter with reduced switches and sources, the switching angles and the corresponding time required to generate the gating pulses of IGBT switches of both multilevel inverters is calculated by Equal Phase (EP) Method. The conventional single phase 21 level cascaded H-bridge MLI with 40 IGBT switches and 10 separate DC sources whereas multilevel inverter with reduced switches and sources require only 8 IGBT switches and 4 separate DC sources to obtain 21 level output voltage. Since, in case of 21 level multilevel inverter with reduced switches and sources, the number of switches are less, the cost is less and the circuitry is simple. The simulation results of both were presented using MATLAB/SIMULINK. Also hardware implementation of 7 level reduced numbers of switches and sources multilevel inverter is done and the results are shown.
Keywords: Multilevel Inverter, MLI, Equal Phase, EP, Separate DC Sources, SDCS, Total Harmonic Distortion, THD
Edition: Volume 12 Issue 2, February 2023,
Pages: 802 - 807