Title :
A novel PWM pulse modifying method for reconstructing three-phase AC currents from DC bus currents of inverter
Author :
Aoyagi, Shigehisa ; Iwaji, Yoshitaka ; Tobari, Kazuaki ; Sakamoto, Kiyoshi
Author_Institution :
Hitachi Res. Lab., Hitachi, Ltd., Hitachi, Japan
Abstract :
A novel PWM pulse modifying method for DC bus current detection has been developed to reduce acoustic noise and distortion. DC bus current detection needs wide pulse durations to reconstruct three AC currents. PWM pulse modifying methods have been proposed to expand short pulse durations at low modulation. However, harmonic currents caused by modification signals distort reconstructed currents and create a specific frequency. In this paper, several PWM modifying methods are examined. Moreover a method for modifying signals is proposed that prevents harmonic currents from distorting reconstructed currents and creating a low frequency. Simulated and experimental results show good performances of total harmonic distortion and a high frequency.
Keywords :
PWM invertors; signal reconstruction; PWM pulse modifying method; acoustic noise reduction; harmonic current distortion; inverter DC bus current; pulse durations; short pulse durations; three-phase AC current reconstructing; total harmonic distortion; Acoustic distortion; Acoustic noise; Acoustic pulses; Acoustic signal detection; Frequency; Harmonic distortion; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; DC bus current detection; current ripple; pulse modifying method; pulse width modulation;
Conference_Titel :
Electrical Machines and Systems, 2009. ICEMS 2009. International Conference on
Conference_Location :
Tokyo
Print_ISBN :
978-1-4244-5177-7
Electronic_ISBN :
978-4-88686-067-5
DOI :
10.1109/ICEMS.2009.5382726
