A Low-Rating Renewable Sources Power Sharing to the Grid Using Space Vector Operated Switched Capacitor Multilevel Inverter and Fuzzy Integrated Switched Z-Source Converter

Renewable energy power sharing with the grid presents various challenges and issues in maintaining power quality. Complications are reduced for higher-rated renewable sources compared to lower-rated sources. Higher-rated sources have higher voltages, making it less complex to convert and share power with the grid. However, for sources with voltages in the range of 20-30V, sharing power with voltage gains is a challenge. In this paper, an SZSC is introduced at the DC link of the combined renewable sources. This SZSC boosts the voltage at the DC link to 3-4 times the original voltage as needed. The voltage at the output of the SZSC is regulated by an FIS voltage controller to improve voltage stability and magnitude generation compared to conventional PI regulators. The boosted DC voltage is then fed to a three-phase SC-MLI operating in synchronization with the grid's three-phase voltages. To reduce harmonic generation, the 9-level SC-MLI uses the SV-PWM technique with signals generated according to the section selection table. For analysis, the renewable sources considered are solar panels and a wind farm supported by a battery module. All these sources and storage units are individually controlled by MPPTs and voltage controllers to ensure stable DC link voltage generation. Power balancing data, voltage stability analysis, and harmonic analysis are performed using MATLAB Simulink software and the Electrical toolbox.