Research of four quadrant cascaded high voltage frequency converter based on carrier phase shifting PWM

This article analyzed the principle of a carrier phase-shift PWM control policy and suppresses technical of common-mode voltage based on six power unit 36-pulse cascaded high-voltage frequency converter. It proved useful and effective in getting rid of common mode voltage by third harmonic injection. The waves from simulation proved the feasibility of the algorithm. Additionally, it introduced the motor loading test, gave the AC-side voltage waveforms at 2Hz and 50Hz respectively, and analyzed motor´s dynamic characteristics in low frequency and the high frequency two conditions.