Extended Voltage Swell Ride Through Capa

Voltage swells are among the most damaging disturbances in industrial power systems, which can result in severe damage or failure of converters. This study aims to present an extended ride-through strategy for pulsed-width-modulation voltage-source rectifiers (PWM-VSRs) to manage voltage swells of up to 1.8 p.u. through dynamic modifications in operational protocols. Utilizing a combination of dynamic overmodulation and inductive current drawing, the proposed method allows PWM-VSRs to effectively handle swells without saturating their control systems. The approach is demonstrated to enable straight ride-through of up to 15% and 42% for three-phase and single-phase swells, respectively, enhancing overall operational resilience. Moreover, the developed modulation index supervisor and color loss modulating inductive current facilitate handling greater disturbances, ensuring that the converters maintain effective control. This research employs decision-making space vector modulation and a nonlinear control law derived from the converter’s state variable model, thereby improving both active and reactive responses during disturbances. The results indicate significant potential for PWM-VSRs to increase reliability and efficiency in industrial applications, particularly in environments susceptible to voltage swells.