Voltage

Engineering

Grid-connected photovoltaic power system

Grid-tie inverter

Computer science

Grid

Maximum power point tracking

AC power

Mathematics

Inverter

Electronic engineering

Geometry

Transformer

Photovoltaic system

Electrical engineering

Total harmonic distortion

IEEE Access

This paper presents a novel structure of the transformer-less grid-connected inverters.The proposed inverter is combined with six power switches and two power diodes which can generate six voltage levels at the output.Furthermore, the proposed inverter can overcome the leakage current issue in the photovoltaic (PV) system, which is the major problem in grid-tied PV applications.Additional significant features include-reduced filter size, lower total harmonic distortion (THD) of the injected current to the grid, and voltage boosting ability.Moreover, the proposed topology provides full reactive power support to the grid.A control strategy is designed and implemented to provide a voltage boost ability without using any additional dc-dc boost converter.Finally, the performance of the proposed inverter is validated by the 770 W laboratory prototype.

A New Six-Level Transformer-Less Grid-Connected Solar Photovoltaic Inverter With Less Leakage Current