Title :
Discrete Fourier transform harmonic analysis of digitally-generated PWM waveforms which are distorted by switch dead time
Author_Institution :
Motorola Inc., Northbrook, IL, USA
Abstract :
A modified discrete-Fourier-transform method is applied to the harmonic analysis of PWM waveforms which are generated using digital techniques. This method simplifies the calculation of harmonic components, including subharmonics. The effect of dead time distortion caused by phase current polarity is examined in the presence of varying power factor and modulation index. This distortion is characterized by the amplitude change of the modulating frequency component and by determining a weighted total harmonic distortion
Keywords :
PWM invertors; discrete Fourier transforms; harmonic analysis; harmonic distortion; power conversion harmonics; power factor; PWM inverters; dead time distortion; digital techniques; digitally-generated PWM waveforms; harmonic analysis; harmonic components calculation; modified discrete-Fourier-transform method; modulation index; phase current polarity; subharmonics; switch dead time; varying power factor; weighted total harmonic distortion; Discrete Fourier transforms; Frequency modulation; Harmonic analysis; Phase modulation; Pulse width modulation; Pulse width modulation inverters; Sampling methods; Space vector pulse width modulation; Support vector machines; Switches;
Conference_Titel :
Industry Applications Conference, 2000. Conference Record of the 2000 IEEE
Conference_Location :
Rome
Print_ISBN :
0-7803-6401-5
DOI :
10.1109/IAS.2000.883130
