Abstract
The fixed switching frequency method in space vector pulse width modulation strategy has been widely used in the motor speed control system. The three-phase current of the motor under this control method will generate harmonics with higher amplitude at integer multiples of the switching frequency. It is the main source of electromagnetic noise generated by the motor. Therefore, in order to suppress the current harmonics of the driver output and improve the current waveform quality, first of all, the three-phase current ripple generation mechanism based on the common topology of the three-phase motor driver is deduced theoretically and the current ripple prediction model is obtained. The results of the prediction model are then used to specifically modify the switching frequency of motor driver to reduce the amount of current harmonics during motor rotation. The experimental results show that the harmonic suppression control method based on ripple prediction model is more effective than the traditional fixed switching frequency method in reducing the motor current harmonics and improving current quality. The method in this paper has been applied in an underwater propulsion system.
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