Inter-sample modeling of the converter output admittance

Ville Pirsto*, Jarno Kukkola, Marko Hinkkanen, Lennart Harnefors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The stability of the converter-grid interconnection can be studied by analyzing the product of the converter output admittance and the grid impedance. For reliable stability analysis, it has been of interest to obtain accurate converter output admittance models for a wide range of frequencies, ideally also around and above the Nyquist frequency of the converter system. This paper presents a modeling method for the output admittance of power converters defined in the Laplace domain that takes into account the discrete nature of the control system. The modeling method is based on analyzing the inter-sample behavior of sampled-data systems, a class of systems which includes the modern digitally-controlled power converters. The proposed method is compared to conventional admittance modeling methods, and its accuracy is validated by means of simulations and experiments.
Original languageEnglish
Number of pages11
JournalIEEE Transactions on Industrial Electronics
DOIs
Publication statusE-pub ahead of print - 19 Sep 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Admittamce modeling
  • Nyquist frequency
  • Power converter
  • Sample-data system

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