Quasi-Z-Source Inverters in Renewable Power Systems Modeling

This paper is devoted to in-detail demonstrationand description of the overall functionality and deailed processes in every component quasi-z-source voltage inverter. Expressions for currents voltages on all elements circuit standard "shoot-trough" modes are provided. These ratios demonstrate one main technological advantages topology: which possibility reduction capacitor that forms quasi-z-circuitry led size weight resulting device additional reliability increase. Matlab calculations,that provided practical part article,fully confirmed theoretical dependencies. At same time, obtained results simulation demonstrated advantage quasi-impedance topology - ability provide a continuous current input source without zero pauses. That additionally by graphical representation transients spectrum output As second topic article, problem control system operating principle selection was discussed. it determined process previous research modeling inverter, providing switching inverter valves frequency equal desired voltage, most world’s electrical power systems 50-60 Hz, leading mass increase circuitry, according its design ratios. Additionally, such either not represented modern electronic components lineup or sufficient energy losses some cases could neglect boost effect circuitry implementation. To overcome discovered limitations, several PWM methods were suggested. All them be divided into two groups: classic vector methods. Classic based combination basic modulation techniques widely used conventional full-bridge invertors with insertion “shoot-trough” state activation mode. A model classical approach offered. It shown method simple "breakdown" placement time intervals within normal period operation bridge The only difference between models inclusion an constant signal exceeding amplitude carrier leads state.In conclusion discussion implementation up-to-date designs different approaches aimed parameters modification