Observer-based state-space current control for a three-phase grid-connected converter equipped with an LCL filter

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Research units


This paper presents a state-space current control method for active damping of the resonance frequency of the LCL filter and setting the dominant dynamics of the converter current through the direct pole placement. A state observer is used, whereupon additional sensors are not needed compared to the conventional L filter design. The relationship between the system delay and instability caused by the resonance phenomenon is considered. Nyquist diagrams are used to examine the parameter sensitivity of the proposed method, and the method is validated with simulations and experiments.


Original languageEnglish
Title of host publicationIEEE Energy Conversion Congress and Expo (ECCE 2013)
Publication statusPublished - 15 Sep 2013
MoE publication typeA4 Article in a conference publication

    Research areas

  • delay, LCL filter, Nyquist diagram, parameter sensitivity, phase-lead compensator, state-space current control

ID: 648829