A new method to linearize any triangle-comparison-based PWM by reshaping the modulation command

Author

Kaura, Vikram

Author_Institution

Standard. Drives Div., Rockwell Autom.-Allen Bradley Co., Mequon, WI, USA

Volume

33

Issue

5

fYear

1997

Firstpage

1254

Lastpage

1259

Abstract

A new method, which linearizes any triangle-comparison-based pulsewidth modulation (PWM) in the pulse-dropping region, is presented. Based on the original modulating command, the method produces a modified command as a function of the modulation index. This modified command compensates for the volt-sec which are lost due to a portion of the original modulating command exceeding the boundaries of the triangle carrier. The method eliminates the need to overmodulate in the pulse-dropping region and prevents erosion of the dynamic range of the associated control. This method is applied to three common PWM algorithms. Analytical expressions are derived for each case and verified on a 100 kW AC/DC converter

Keywords

AC-DC power convertors; PWM power convertors; compensation; 100 kW; AC/DC converter; modified command; modulation command reshaping; modulation index; pulse-dropping region; pulsewidth modulation; triangle-comparison-based PWM; volt-sec compensation; Automatic control; DC-DC power converters; Dynamic range; Industry Applications Society; Linearity; Phase modulation; Power conversion; Pulse width modulation; Space vector pulse width modulation; Voltage;

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/28.633803

Filename

633803