A Modified High Voltage Gain Quasi-Impedance Source Coupled Inductor Multilevel Inverter for Photovoltaic Application

Abstract

The quasi-impedance source inverters/quasi-Z source inverters (Q-ZSIs) have shown improvement to overwhelmed shortcomings of regular voltage-source inverters (VSIs) and current-source inverters (CSIs) in terms of efficiency and buck-boost type operations. The Q-ZSIs encapsulated several significant merits against conventional ZSIs, i.e., realized buck/boost, inversion and power conditioning in a single power stage with improved reliability. The conventional inverters have two major problems; voltage harmonics and boosting capability, which make it impossible to prefer for renewable generation and general-purpose applications such as drive acceleration. This work has proposed a Q-ZSI with five-level six switches coupled inverter. The proposed Q-ZSI has the merits of operation, reduced passive components, higher voltage boosting capability and high efficiency. The modified space vector pulse width modulation (PWM) developed to achieve the desired control on the impedance network and inverter switching states. The proposed PWM integrates the boosting and regular inverter switching state within one sampling period. The PWM has merits such as reduction of coupled inductor size, total harmonic reduction with enhancing of the fundamental voltage profile. In comparison with other multilevel inverters (MLI), it utilizes only half of the power switch and a lower modulation index to attain higher voltage gain. The proposed inverter dealt with photovoltaic (PV) system for the stand-alone load. The proposed boost inverter topology, operating performance and control algorithm is theoretically investigated and validated through MATLAB/Simulink software and experimental upshots. The proposed topology is an attractive solution for the stand-alone and grid-connected system.

Electric Vehicles Charging Stations’ Architectures, Criteria, Power Converters, and Control Strategies in Microgrids

“…Furthermore, advanced controls like hierarchical control architecture, fuzzy control architecture, and multi-agent-based control architecture can be used for maintaining voltage fluctuations. The limited capacity of the energy storage system is necessary to overcome fluctuation of DC Bus voltage and maintain power balance [72,[75][76][77][78].…”

Analysis and Design of a Multi-Port DC-DC Converter for Interfacing PV Systems

“…Consequently, the transformer-induced EMF reduces during the time interval of this mode, λ. Therefore, the current of unit 'a', which is feeding power to the output side, increases according to (1). In addition, i 2 decreases.…”

“…Recently, photovoltaics (PV) interfacing systems have been attracting widespread attention. Many schemes are used for PV interfacing systems [1][2][3][4][5]. A classical PV interface scheme is formed from three stages.…”

A Hybrid DC–DC Quadrupler Boost Converter for Photovoltaic Panels Integration into a DC Distribution System

“…Several high-voltage gain DC-DC step-up converters for renewable energy applications can be found in the literature [26][27][28][29][30][31][32]. In this section, the proposed converter is compared only to the converters that have shared ground between the input and the output, and do not have any floating active switch or coupled inductors.…”