Three-Phase Six-Level Multilevel Voltage Source Inverter: Modeling and Experimental Validation

Abstract

This research proposes a three-phase six-level multilevel inverter depending on twelve-switch three-phase Bridge and multilevel DC-link. The proposed architecture increases the number of voltage levels with less power components than conventional inverters such as the flying capacitor, cascaded H-bridge, diode-clamped and other recently established multilevel inverter topologies. The multilevel DC-link circuit is constructed by connecting three distinct DC voltage supplies, such as single DC supply, half-bridge and full-bridge cells. The purpose of both full-bridge and half-bridge cells is to provide a variable DC voltage with a common voltage step to the three-phase bridge’s mid-point. A vector modulation technique is also employed to achieve the desired output voltage waveforms. The proposed inverter can operate as a six-level or two-level inverter, depending on the magnitude of the modulation indexes. To guarantee the feasibility of the proposed configuration, the proposed inverter’s prototype is developed, and the experimental results are provided. The proposed inverter showed good performance with high efficiency of 97.59% following the IEEE 1547 standard. The current harmonics of the proposed inverter was also minimized to only 5.8%.

A Unified Linear Self-Regulating Method for Active/Reactive Sustainable Energy Management System in Fuel-Cell Connected Utility Network

“…These parts are in charge of the fuel-cell-connected utility network's practical management and DC-to-AC conversion. The DC-AC operating device is referred to as an inverter [41], [42], [43]. The grid receives its active power from fuel cells through the parallel-connected inverter.…”

A Pencil Shaped 9-Level Multilevel Inverter With Voltage Boosting Ability: Configuration and Experimental Investigation

“…Thus, it has serious voltage imbalance issues which requires the application of complex modulation techniques to be resolved. FC MLIs also requires small number of DC sources but has the characteristics of using large number of capacitors and 2(n + 1) 2(3n + 5) 2(n + 1) 4n + 5 14(n + 1) 0 Yes [10] n + 3 2(2n + 5) n + 3 2n + 7 4(4n + 1) 0 Yes [11] n + 3 5n + 14 n + 3 2n + 7 25n + 6 0 Yes [12] n + 3 2(2n + 3) n + 3 2n + 7 16(n+1) 0 Yes [13] n + 3 4(n + 3) 2(n + 1) 4n + 5 8(2n + 3) 0 Yes [14] n + 3 4(n + 2) n + 3 2n + 7 2(11n + 1) 0 Yes [15] n + 3 power switches as shown in Fig. 8(a) which can greatly hamper the efficiency of the MLI by inducing capacitor losses in the system.…”

A novel extendable multilevel inverter for efficient energy conversion with fewer power components: Configuration and experimental validation

“…Thus, these types of MLIs are mostly unsuitable for grid applications and renewable energy conversions. For the MLI that are unipolar in nature, [9][10][11][12] polarity generation (i.e., positive and negative voltage levels) is done by utilizing H-bridge circuits. Although the H-bridge roughly doubles the voltage produced by the level generation (LG) section, the switches of this circuit endures the highest voltage stress, which is equal to the summation of total DC voltages.…”