“FIVE-STAGE, SINGLE-SOURCE MULTILEVEL INVERTER FOR GRID-CONNECTED PHOTOVOLTAIC SYSTEMS”

Abstract: When compared to two-stage converters, this five-stage converter helps the inverter handle almost twice as much power. Design issues with power conditioning units for grid-connected solar photovoltaic systems include power quality, efficiency, dependability, implementation costs, etc. In order to solve the majority of the practical limitations of central DC source application, this article discusses a single DC-source-based five-level-doubling network high-resolution multilevel inverter topology with the right combination of switches. To boost efficiency and double inverter utilization, a five-stage high-resolution multilevel inverter solution is modified. This work also demonstrates the system's ability to handle reactive power and block faults. MATLAB/Simulink is used to extensively simulate the converter. The proposed concepts' effectiveness is confirmed by the laboratory prototype's experimental findings. A common PV array powers the main bridge, while separate sources power the auxiliary bridges. Even though these separated sources need far less electricity, The overall cost of the system reflects it. A low-gain PI controller has been used to eliminate these isolated sources. The dc source in this converter only feeds the main bridge. With the aid of transformers, all major bridges for grid-connected solar PV applications are combined and fed by a single PV array. During unbalancing, there won't be any mismatch because three DC buses are combined. As a result, the system will not stray from MPPT and will continue to provide power quality. Between the PV and the inverter, there is a boost converter. When compared to single-stage converters, this two-stage converter enables the inverter handle almost twice as much power.