Voltage Regulation Optimization of a Modified Seven-Level Packed U-Cell Inverter with Mamdani Fuzzy Logic

This research paper investigates the use of Mamdani fuzzy logic control (FLC) in power inverters to regulate voltage, with a focus on how well it regulates the output voltage as well as reduces total harmonic distortion (THD). This study specifically analyzes the performance of a Modified Seven-Level U-Cell (MPUC) inverter topology and compares the FLC results with the traditional proportional-integral-derivative (PID) method. The simulation results indicate that the FLC method offers superior voltage regulation, maintaining the voltage at 180.5 volts with a center of gravity of 1.1280. This method achieves a higher modulation amplitude and significantly lowers THD from 19.31% to 14.97%, outperforming the PID method. Mamdani FLC demonstrates increased adaptability to input voltage variations, maintaining lower distortion levels and ensuring a cleaner output signal. Additionally, it reaches steady-state conditions more efficiently, which is critical for applications that require rapid stabilization. This research emphasizes the robustness and efficiency of FLC in controlling MPUC inverters and presents it as a promising solution for accurate and stable voltage regulation in renewable energy applications. The findings support the integration of advanced control techniques into power grids and promote more efficient and sustainable energy systems.