Mitigating Commutation Failures in High-Voltage DC Transmission Systems with a Logistic Function-Based AC/DC-VDCOL Switchover Control

This research aims to enhance the stability and reliability of high-voltage DC transmission systems. An analysis of the control effects of two input methods (AC voltage and DC voltage) in the VDCOL module was conducted, and an improved logistic function-based control strategy for AC/DC-VDCOL conversion was proposed. This strategy effectively reduces the frequency of commutation failures in the inverter valve group and shortens system fault recovery time. Simulation results demonstrate that this method significantly enhances high-voltage DC transmission systems' continuous commutation fault suppression and recovery capabilities. This study's discoveries offer valuable perspectives for enhancing the operational effectiveness of high-voltage DC transmission systems in real-world scenarios.