INVESTIGADORES
CHIACCHIARINI Hector Gerardo
artículos
Título:
Reduction of harmonic distortion in power inverters
Autor/es:
ALEJANDRO RAÚL, OLIVA; HECTOR GERARDO CHIACCHIARINI; AYMONINO ANDRÉS,; MANDOLESI PABLO,
Revista:
LATIN AMERICAN APPLIED RESEARCH
Editorial:
UNS-CONICET
Referencias:
Lugar: Bahía Blanca; Año: 2005 vol. 35 p. 89 - 93
ISSN:
0327-0793
Resumen:
The output voltage of PWM power inverters shows harmonic distortion due to several causes; the main ones are the modulation algorithm, nonlinearities in the output filter, dead times, voltage drops across the switches and modulation of the dc bus voltage. The distortion is more evident when using low dc bus voltages. As a result, motors driven by these inverters have important torque pulsations. This work proposes to reduce the distortion produced by dead times and voltage drops across the switches using a simple algorithm that recalculates the width of each PWM pulse, while preserving the ideal area. By simulation, the THD was reduced from 18% to 0.29% in a single-phase inverter. The proposed algorithm only needs products and sums, so it is suitable for being implemented on a DSP with a very low processing load.
