Common-Mode Voltage Reduction Scheme for Back-to-Back Three-Level Converters Based on Passive Filters

During wind turbine integration, grid voltage and current waveform distortions arise due to the intermittent nature of distributed energy sources. Frequent switch operation causes substantial common-mode voltage (CMV), lea-ding to a notable decrease in the efficiency and reliability of wind power systems. This research focuses on improving wind turbine grid connection using back-to-back three-level converters. By employing hardware enhancements with passive filters, this paper quantitatively examines the filtered output signals. The findings indicate that this approach can effective lyreduce both current harmonic distortion (THD) and com mon-mode voltage (CMV), thereby improving output voltage and current quality to ensure system stability. The propose d method demonstrates considerable practical utility, which is validated through simulation results.