This paper introduces an innovative design for the super-twisting sliding mode control (ST-SMC) strategy, which is applied for the first time to a three-phase shunt active power filter (SAPF) utilizing a flying capacitor multicellular inverter (FCMI). The objective of the proposed ST-SMC is to enhance control over filter currents, flying capacitor voltages and the DC bus voltage. Simulation results, under balanced and unbalanced nonlinear load conditions, demonstrated exceptional capabilities in harmonic reduction while maintaining robust dynamic response characteristics. Additionally, it showed remarkable performance in tracking both filter currents, DC voltage, and flying capacitor voltages.
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