Spectrum Estimation of Input Current Ripple on a Wide Class of Multi-Level Grid-Tied Converters

Multi-level (ML) converters are frequently used to implement grid-tied ac-dc conversion systems. Their design may benefit from multi-objective optimization techniques, which typically involves time-consuming circuit simulations in order to obtain input current estimations suitable for input inductor...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2022, p.1-5
Main Author: Biadene, Davide
Format: Article
Language:English
Subjects:
AC-DC converter
Electromagnetic interference
EMI filter
Harmonic analysis
Inductors
input filter design
multi objective optimization
multi-level converters
Optimization
Pulse width modulation
pulsewidth modulation (PWM) rectifier
Switches
Voltage
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Description
Summary:Multi-level (ML) converters are frequently used to implement grid-tied ac-dc conversion systems. Their design may benefit from multi-objective optimization techniques, which typically involves time-consuming circuit simulations in order to obtain input current estimations suitable for input inductor and EMI filters design. Herein, a closed-form expression of the input current ripple is derived to ease harmonic content estimations. The proposed approach separates the fundamental grid-current component from its ripple and models the latter like an amplitude modulation, where the modulating signal is its envelope and the carrier is the triangular current waveform. First, a general waveform analysis of ML converters is performed to derive the voltage across the grid-side inductor, then the associated current ripple is modeled. Experimental results on an ML converter prototype are reported to validate the analytical results.
ISSN:0885-8993
DOI:10.1109/TPEL.2022.3222570