Title :
A new method to linearize any triangle comparison based PWM by reshaping the modulation command
Author_Institution :
Allen-Bradley Co., Mequon, WI, USA
Abstract :
A new method, which linearizes any triangle comparison based 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 over-modulate 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&rlhar2;DC converter
Keywords :
AC-DC power convertors; PWM power convertors; 100 kW; AC-DC converter; dynamic range erosion prevention; modulation command reshaping; modulation index; pulse dropping region; triangle comparison based PWM linearisation; AC-DC power converters; Automation; Dynamic range; Linearity; Phase modulation; Power conversion; Pulse modulation; Pulse width modulation; Space vector pulse width modulation; Voltage;
Conference_Titel :
Industry Applications Conference, 1996. Thirty-First IAS Annual Meeting, IAS '96., Conference Record of the 1996 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-3544-9
DOI :
10.1109/IAS.1996.560194
