Packed U-Cell Inverter with Mamdani Type Fuzzy Logic Controller to Regulate Output Voltage for Off-Grid Applications

This paper focuses on the utilization of the Seven Level Packed U-Cell (PUC) inverter topology in the conversion of DC to AC electrical power from the off-grid photovoltaic (PV) system, aiming to achieve less distortion and constant output voltage. Traditional Multilevel Inverter (MLI) topologies suffer from drawbacks such as the numerous requirements of switching components, DC voltage supplies, and capacitors, particularly for higher voltage levels. To overcome these problems, Seven Level PUC inverter topology is applied here. To maintain the voltage output at the required level even when the input voltage fluctuates, a Fuzzy Logic Controller (FLC) with Mamdani type is employed. Simulation shows that the PUC inverter with the FLC successfully maintains the output voltage level at the desired range. Furthermore, to assess the superiority of the FLC, a comparative evaluation between the FLC and the Proportional-Integral-Derivative (PID) control methods for the PUC is conducted. The results reveal that the FLC exhibits more consistent and reliable feedback compared to the PID controller. By providing a comprehensive analysis of the FLC’s performance and comparing it with the PID controller, this paper confirms the advantages of utilizing the FLC in achieving a constant and less distorted voltage output in the Seven Level PUC inverter.