Optimal control of multilevel power conversion systems with integrated capacitor-based energy storage for renewable energy applications

The highly efficient switching capacitor-based five-level multilevel inverter (MLI) described in this research paper greatly improves on traditional inverter designs by producing a five-level output voltage waveform with fewer semiconductor components. With just six semiconductor switches, one diode, one capacitor, and a single DC input source, the suggested single-phase design uses an asymmetrical voltage source configuration to obtain the maximum voltage gain. This novel architecture is ideal for small-scale but effective power conversion systems since it reduces cost, bulk, and switching losses while also streamlining the overall system design. In order to guarantee optimal switching performance under both resistive (R) and inductive (RL) load circumstances, a phase-disposition pulse width modulation (PD-PWM) technique is used. PD-PWM control strategy. The optimisation is achieved in terms of reduced switch count, lower total standing voltage (TSV), and enhanced voltage gain. A capacitor-based switched-capacitor configuration is utilised as an energy storage element, which enables voltage boosting and self-voltage balancing through controlled charging and discharging operations. With an impressive 98.43% efficiency rate, the system efficiently lowers energy losses while improving performance. Additionally, the inverter keeps total harmonic distortion (THD) within IEEE 519 requirements while achieving a voltage gain that is almost double that of conventional designs. The inverter’s suitability for various applications, including electric drives, grid-connected power interfaces, and renewable energy systems, has been validated through MATLAB/SIMULINK simulations and experimental testing on a laboratory-built prototype hardware model.