Switched‐capacitor inductor Z‐source inverter with an impedance network

Abstract

The Z‐source inverter was introduced to overcome shortcomings of voltage source inverter and current source inverter. In this paper, the concept of one switched‐inductor Z‐source inverter is extended to switched‐capacitor inductor ZSI with an impedance network. In the proposed inverter, capacitors are used instead of the side diodes of the one switched inductor Z‐source inverter. The proposed inverter has a higher boost factor compared to One SL‐ZSI and quasi‐ZSI. Also, it has lower voltage stress compared to similar inverters. The proposed inverter can be extended to n cases in cascade form. The components used in the proposed topology are lower than the SL‐ZSI. The analysis, derivation of boost factor, capacitor voltages, diode voltages, and switch voltages stress of the proposed inverter topology are carried out and are compared with the similar inverters. The advantages of the proposed structure are verified through simulation and implementation. The simulation is performed in MATLAB/SIMULINK.

New combined impedance‐source network inverter with high gain performance in low shoot‐through and improved quality factors

“…More researchers tried to solve these problems by combining SI with ZSI and qZSI structures. 10,11 The structure introduced in Abbasi et al 8 integrates the conventional ZSI converter with a SI network and reduces the number of components; nonetheless, the problem of input current discontinuity exists. The proposed structure in Karbalaei and Mardaneh 11 is a combination of qZSI and SI, which solves the problem of input current discontinuity, whereas the number of passive elements is increased.…”

Quasi Z‐source inverter with switched‐capacitor‐inductor for enhancing boost factor

“…Different indicators are considered to evaluate these converters according to their type and application, including the number of elements, current and voltage stress on the components, the current ripple input and output voltage ripple, the operating range for different duty cycles (D), and so on. In this regard, the most essential feature of ZSI is the amount of increase or decrease in input voltage, because of which different structures have been developed for them [10–39]. By changing the traditional ZSI structure, qZSI [10], improved ZSI (IZSI) [11], inductor ZSI (L‐ZSI) [16], and switched‐inductor‐capacitor ZSI (LC‐ZSI) [32] are provided to fix the conventional Z‐source inverter defects.…”

“…This paper presents two topologies using SL‐qZSI [14, 15]. Also, the proposed topology has n an acceptable boost factor and a more continuous input current than the one proposed in [37].…”

A new single‐stage continuous input current‐based high gain boost inverter: Analysis and implementation

“…Several single-stage boost inverter topologies including switched boost and Z-source based structures are recently reported in literature. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] The conventional ZSI (CZSI) is utilized for many applications such as photovoltaic systems, uninterruptible power supply (UPSs), and micro-grid for its voltage boosting capability. 2,3 However, it has several drawbacks such as discontinuous source current and the higher number of passive (or LC) elements.…”

“…The ZSIs can step up the voltage level by making use of this ST interval. Several single‐stage boost inverter topologies including switched boost and Z‐source based structures are recently reported in literature 3–18 …”