Half‐bridge Z‐source inverter based on T‐source configuration with continuous input current and a high boost factor

Abstract

This paper proposes a new half-bridge-based impedance source inverter with coupled T-shaped inductors. The proposed inverter has a continuous input current and a high boost factor. The proposed topology is thoroughly investigated, along with its operating modes and control system, and the boost factor equation is derived. Additionally, the operating modes' results are incorporated into the design of used components, such as capacitors and inductors. To determine the suggested topology's advantages and disadvantages, a comparison with similar topologies is made based on the number of power electronic devices employed, the boost factor, and the voltage stresses experienced by the components. On the base of these comparisons, it is concluded that the proposed half-bridge-based Z-source inverter has a high boost factor, fewer power electronic components, and reduced voltage stresses. Following that, a power loss study is performed to ascertain the system's power losses and overall efficiency. The prototype's experimental results are considered to evaluate the proposed topology's correct performance.boost factor, continuous input current, half-bridge-based Z-source inverter, voltage stress on devices | INTRODUCTIONConventional inverters, notwithstanding their structural advancements, have certain key limitations. For example, the voltage source inverter (VSI) always operates in a buck mode regardless of the amount of the output voltage. In the same way, the current source inverter (CSI) is always used to boost the power. Furthermore, for VSI and CSI, the short circuit and open circuit states are not permitted. In return, by including an impedance network into the Z-source inverter, 1 it is capable of performing both buck operations and boost operations. Furthermore, the short circuit and open circuit states, often known as the shoot-through (ST) states, are the usual states for the Z-source inverter (ZSI). Because of its unique characteristics, the ZSI structure has recently piqued the interest of researchers in a variety of applications. 2-5 ZSI, however, has a limitation due to its discontinuous input current, which restricts its application. The quasi Z-source inverter (QZSI) with a continuous input current was introduced by Anderson and Peng. 6 Although the QZI has the same boost factor as the ZSI, it has fewer components and less voltage stress on the capacitors. In Loh et al., 7 a new structure known as the embedded Z-source inverter (EZSI) configuration is introduced. The ZSI and this structure have the same number of needed devices and boost factor, as demonstrated by the comparison. EZSI, on the

A family of Z‐source‐based half‐bridge inverters: Topology derivation

“…Different Z-source-based half-bridge topologies have been presented in [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Considering these topologies, it can be deduced that the structures in which coupled inductors are utilized can provide a higher boost-factor than their counterparts.…”

“…Nonetheless, the conditions for all of the topologies are considered the same, so if there are two DC voltage sources in a structure with a magnitude of V i , the extent of the DC voltage source will be equal to 2V i in a topology with a single voltage source. These structures are presented in [14][15][16][17][18][19][20][21][22][23][24][25][26][27], where the existing topologies in [14][15][16][17][18][19][20] do not comprise coupled inductors, whereas the existing structures in [21][22][23][24][25][26][27] contain this device. Moreover, coupled inductors utilized in topologies in [23] and [24] are Γ-shaped, while the others include T-type coupled inductors.…”

“…However, conventional Z-source inverters can offer an output voltage with a much lower frequency. In [14][15][16][17][18][19][20][21][22][23][24][25][26][27], different examples of Z-source-based half-bridge inverters are suggested, and their features will be analyzed.…”

High Robust Control Model of High Step Up Three Phase Y Source Inverters based on Model Predictive Control

“…T-Source Inverter is like Z-Source aside from the utilization of high recurrence low spillage inductance transformer and one Capacitance. It has low responsive parts in contrast and ordinary ZSI [10]. Because of this, productivity enormously increments.…”

“…The difference between T-Source and Z-source is that the L-C tank circuit has been replaced by T-network, and the T-network has the samefunction concerning the boosting vai shot through between two switches in one leg or all legs. [10].…”