Three-Phase AC-DC Converter for High-to-Low Voltage Applications
Keywords:
AC-DC conversion, Harmonic distortion, MATLAB/Simulink, Three-phase converter, ThyristorAbstract
This work describes the design and modeling of a three-phase AC-DC converter for high-to-low-voltage applications that uses thyristor-based rectification. The research compares the effectiveness of 6-pulse and 12-pulse converter topologies, with an emphasis on total distortion of harmonics (THD), current stress, semiconductor losses, and output DC voltage profiles. The converter is meant to provide a regulated DC output by adjusting the firing angle of thyristors. A mathematical technique is used to calculate the firing angle required to achieve the desired output voltage. To assess operational performance under identical input circumstances, the system is modeled and simulated in MATLAB/Simulink. The simulation results show that both topologies can produce the necessary DC output; nevertheless, there are considerable disparities in waveform quality and ripple content. Compared with the 6-pulse converter, the 12-pulse arrangement performs better, with less ripple and a more stable output. In comparison, the 6-pulse converter has higher ripple and requires additional filtering for reliable operation. The results demonstrate that increasing the number of pulses enhances the quality of the DC output and decreases harmonic distortion, making the 12-pulse arrangement more appropriate for high-performance applications.
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