Equivalence of the integrator-based and disturbance-observer-based state-space current controllers for grid converters

F M Mahafugur Rahman, Ville Pirsto, Jarno Kukkola, Marko Hinkkanen, Diego Pérez-Estévez, Jesús Doval-Gandoy

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Abstract

This article deals with discrete-time state-space current controllers for three-phase grid converters equipped with an LCL filter. The integral action in the controller can be implemented either using an integrator or a disturbance observer. The results show that the disturbance-observer-based and integrator-based controllers become mathematically equal if the feedforward gains are selected to be equal, the feedforward zero is placed to cancel the pole originating from the integral action, and the closed-loop poles are placed identically. The equivalent performance in both designs is verified by means of analyses and experiments. The equivalence is also shown for double-frequency current controllers.

Original languageEnglish
Article number9075404
Pages (from-to)4966-4976
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume68
Issue number6
DOIs
Publication statusPublished - Jun 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Disturbance observer
  • Double-frequency controller
  • Grid converter
  • Integrator
  • State-space current control

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