1results about How to "Reduce waveform distortion rate" patented technology

This invention provides a filtering method, apparatus, frequency converter, and storage medium. The filtering method includes: obtaining a filtering capacitor based on the cable length between the frequency converter and the motor; obtaining a filtering inductor based on the motor's rated parameters; and filtering the voltage signal to be output to the motor using the filtering inductor, the filtering capacitor, and a pulse width modulation waveform determined based on both, to obtain a filtered voltage signal. This invention improves the accuracy of filtering parameter calculation, reduces computational complexity, lowers the waveform distortion rate and phase voltage amplitude of the input voltage signal at the motor end, and reduces harmonics in the voltage signal.