Abstract
For a three-phase induction motor, the high-frequency current harmonic peak and switching losses under constant switching frequency are significant. This may cause motor vibration and high-frequency narrow-band noise. In this paper, a multi-sequence variable switching frequency modulation strategy was proposed to solve this problem. Firstly, the RMS values and peak values of the current ripple under different vector sequences are derived based on coordinate transformation. Then, the optimal switching vector sequence is selected according to the principle of minimum RMS of the current ripple. The relationship between the current ripple peak and the modulation ratio and phase angle is analyzed, and the carrier frequency is optimized based on the current ripple peak under optimal sequence to reduce the switching losses. Finally, the effectiveness of the proposed modulation technology is verified through Matlab/Simulink simulation.
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