New converter circuitry for PV applications using multilevel converters

This paper presents an analysis and the design of an off grid PV system for providing electricity for remote area. The system composed of dc-dc multilevel boost converter (MLBC) which is used for extracting maximum power from the cell. It has been chosen to generate three dc voltages at its output terminal. In addition to, a multilevel dc link inverter suitable for the generated dc bus voltages. The inverter generates 7 levels at its output terminal. A maximum power point tracking (MPPT) program is designed and simulated to extract the maximum power from the PV cell. Regulation of the ac output voltage is executed by employing constant voltage and frequency control on its output voltage. To validate the studied system, analysis, simulation, and experimental results have been provided. Where inverter switch control signals are derived using multicarrier PWM switching technique. The effect of the modulation indexes on the load voltage and on the THD has been studied.