NDLI: Multiphase optimal injection PWM with dual carrier frequency to reduce current THD

Content Provider	IET Digital Library
Author	Chen, Keng Yuan Xie, Yu Lin
Abstract	Multiphase voltage source inverter drives have recently applied to various industrial applications for variable speed motor drives. Both space-vector pulse-width modulation (SVPWM) and discontinuous PWM (DPWM) are commonly used modulators. Under the three-phase setting, it is well known that SVPWM is preferred for small modulation indices, whereas DPWM is better for large modulation indices. However, little detailed discussions on multiphase setting are reported. Further, for phase number higher than 5, no explicit instructions on how to select between SVPWM and DPWM to reduce current total harmonics distortion (THD). This study developed a generalised method to select either SVPWM or DPWM under different reference amplitudes and angles. The method can be easily extended to general N-phase settings. Firstly, a generalised expression of PWM harmonic flux which is proportional to current distortion is derived. Second, by selecting the modulator that corresponds to minimum rms harmonic flux for every carrier period, optimal injection pulse-width modulation (OIPWM) is constructed. The theoretical analyses indicate that the harmonics distortion of OIPWM is greatly improved comparing with conventional SVPWM. A five-phase inverter drive built for experiments verifies the correctness and effectiveness of the proposed OIPWM.
Starting Page	1061
Ending Page	1076
Page Count	16
ISSN	17554535
Volume Number	10
e-ISSN	17554543
Issue Number	Issue 9, Jul (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/10/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2016.0437
Journal	IET Power Electronics
Publisher Date	2017-03-31
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	A.C. Machine Current THD Reduction D.C. Machines Discontinuous PWM DPWM Drive Dual Carrier Frequency Five-phase Inverter Drive General N-phase Settings Generalised Method Harmonic Distortion Minimum RMS Harmonic Flux Motor Drive Multiphase Optimal Injection PWM Multiphase Voltage Source Inverter Drive OIPWM Optimal Injection Pulse-width Modulation PWM Harmonic Flux Expression PWM Invertors Small Modulation Indices Space-vector Pulse-width Modulation SVPWM Total Harmonics Distortion Variable Speed Drive Variable Speed Motor Drive Voltage-source Converter
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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