Simple Time Averaging Current Quality Evaluation of a Single-Phase Multilevel PWM Inverter | IEEE Journals & Magazine | IEEE Xplore

Simple Time Averaging Current Quality Evaluation of a Single-Phase Multilevel PWM Inverter


Abstract:

This paper addresses theoretical calculation of a single-phase multilevel pulsewidth modulation (PWM) inverter current total harmonic distortion (THD). Analytical approac...Show More

Abstract:

This paper addresses theoretical calculation of a single-phase multilevel pulsewidth modulation (PWM) inverter current total harmonic distortion (THD). Analytical approach introduced in late 1980s for a two-level inverter is generalized for an arbitrary level count for a single-phase inverter. Although the obtained closed-form piecewise analytical solutions assume (infinitely) large ratio of switching and fundamental frequencies and pure inductive load, they are practically very accurate for the ratios of (apparent) switching and fundamental frequencies larger than 25-30 and inductance-dominated loads. Along with strict mathematical solutions, simple accurate Bessel function approximation and hyperbolic average trend one are suggested. The formulas clearly reveal a single-phase PWM inverter current THD dependence on modulation index for an arbitrary voltage level count and are easily modified to cover grid-connected cases.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 63, Issue: 6, June 2016)
Page(s): 3605 - 3615
Date of Publication: 10 March 2016

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