Accuracy Analysis of the Zero-Order Hold Model for Digital Pulsewidth Modulation

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Abstract

This paper analyzes the accuracy of the zero-order hold (ZOH) model for the digital pulsewidth modulator (DPWM) in the s-domain. The s-domain model and the exact z-domain model for the control loop of the single-phase inverter with L-type filter is elaborated for quantifying the deviation of the ZOH model for DPWM. The influence of the different computational delay and duty-cycle update modes on this deviation is analyzed in detail. The compensation method for this deviation of the ZOH model is proposed for accurately predicting the stability region of the control system in the s-domain. The simulations and experimental tests are executed to verify the effectiveness and correctness of the theoretical analysis.
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Details

This paper analyzes the accuracy of the zero-order hold (ZOH) model for the digital pulsewidth modulator (DPWM) in the s-domain. The s-domain model and the exact z-domain model for the control loop of the single-phase inverter with L-type filter is elaborated for quantifying the deviation of the ZOH model for DPWM. The influence of the different computational delay and duty-cycle update modes on this deviation is analyzed in detail. The compensation method for this deviation of the ZOH model is proposed for accurately predicting the stability region of the control system in the s-domain. The simulations and experimental tests are executed to verify the effectiveness and correctness of the theoretical analysis.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
VolumePP
Issue number99
ISSN0885-8993
DOI
StateE-pub ahead of print - 2018
Publication categoryResearch
Peer-reviewedYes

    Research areas

  • Compensation method, Model accuracy, Digital pulsewidth modulator, ZOH, Stability analysis
ID: 268139889