Graphical Evaluation of Time-Delay Compensation Techniques for Digitally Controlled Converters

Minghui Lu, Xiongfei Wang, Poh Chiang Loh, Frede Blaabjerg, Tomislav Dragicevic

Research output: Contribution to journalJournal articleResearchpeer-review

81 Citations (Scopus)

Abstract

A main design constraint of the digitally controlled power electronics converters is the time delay of control systems, which may lead to the reduced control loop bandwidth and even unstable dynamics. Numerous time-delay compensation methods have been developed, of which the model-free schemes are independent to model accuracy whereas the model-based alternatives are sensitive to system modeling. This paper first presents a graphical illustration of four model-free delay compensation techniques, where their principles and performances are intuitively elaborated and compared by means of the impulse area equivalence method. An improved time-delay compensation approach is then proposed based on additional area insertion, which provides a wider frequency of phase compensation. Finally, the dynamic response of an LCL-filtered grid-connected inverter was tested with the studied delay compensation methods. Simulations and experimental test results validate the effectiveness of the graphical comparisons and the proposed approach.
Original languageEnglish
Article number7892863
JournalI E E E Transactions on Power Electronics
Volume33
Issue number3
Pages (from-to)2601 - 2614
Number of pages14
ISSN0885-8993
DOIs
Publication statusPublished - Mar 2018

Keywords

  • Delay compensation schemes
  • Digital time delay
  • Graphical evaluation
  • Power-electronics converters

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