A New Non-Isolated Active Quasi Z-Source Multilevel Inverter With High Gain Boost

Abstract

This paper proposes a three-level diode clamped active impedance source (AIS-TLI) inverter based on the quasi Z-source inverter (qZSI). Apart from having minimal components and the inherent benefits of three-level qZSIs, such as single-stage buck-boost capability, shoot-through (ST) immunity, and continuity of input current, the proposed topology has a higher boost capability and excellent efficiency. In addition, the inverter bridge has a higher modulation index, which improves the quality of the output waveform and necessitates less inductance. The proposed topology provides common ground between input and output terminals, which effectively eliminates leakage current in PV-powered single-phase systems. This paper describes the different operating modes principle, dynamic analysis, steady-state analysis, and parameter selection instructions for the proposed in-depth. Furthermore, the suggested inverter's benefits and limitations are compared to the traditional (q)ZSIs and some other AIS-TLIs. Finally, modeling and experimental results are used to confirm the effectiveness of the suggested topology.

A Novel Three-Level Quasi-Switched Boost F-Type Inverter With High Voltage Gain and Self-Balanced Neutral-Point Voltage

“…8(a), the boost factors of the proposed inverter and the works in [19], [22], [23], and [25] are equal which are larger than other inverters. However, as listed in Table III, for the same value of modulation index M, the utilization of ST duty ratio D of the proposed method is higher than that of others, so the proposed inverter has higher voltage gain than the inverters in [14], [19], [22], [23], and [25]. In the range of low modulation index (M ≤ 5/6), the voltage gain of the proposed inverter is higher than 3L-FC-SSI, as shown in Fig.…”

“…To highlight the contribution of the proposed inverter, a comparison between the introduced inverter and some existing inverters, which are the 3L-FC-SSI topology in [21], ZS-NPC-1LC inverter in [14], AEMZS-3LTI topology in [19], RC 2 -AIS-TLI topology in [23], 3L-qSBT 2 I topology in [22], active-qZS-TLI (AqZS-TLI) in [25] and single-stage boost-derived T 2 I (1S-BD-T 2 I) in [26], has been presented. These topologies use conventional three-level inverters (TLIs) behind the boost circuit.…”

“…Proposed 3L-qSBFTI [22], [23], [25], [26] M = 5/6 Proposed 3L-qSBFTI [22], [23], [26] [25] process complicate. However, the methods for RC 2 -AIS-TLI and 1S-BD-T 2 I directly connect two capacitors in parallel, which generates high inrush current through semiconductor devices.…”

Implementation of New Optimal Control Methodology of Quazi Z-Source Inverter Based on MPC

“…Thus, the alternative sets of zero and shoot-through states, i.e. ZSset and SSset, will be tested in a conditional execution loop to guarantee getting minimum power losses of qZSI depending on minimizing a sub-cost function P loss (i) which is defined by (12). The final optimal state is obtained according to which state has the least power losses; the THD optimal state or the alternative one i.e.…”

“…For more information, see https://creativecommons.org/licenses/by-nc-nd/4.0/ operation is based on introducing the nine-state, to be added to the eight cases that existed before by making two switches turn on at the same moment for one leg [11], [12]. ZSI has some advantages, but it also has some problems.…”