Inner-Outer Loop based Robust Active Damping for LCL Resonance in Grid-Connected Inverters using Grid Current Feedback

Aratrik Sarkar, Karan Puttannaiah, Armando Rodriguez

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, the active damping of LCL filter resonance of a grid-tied inverter is studied. We show the tradeoffs involved in designing a hierarchical inner-outer control system by analyzing the control-relevant properties at multiple loop-breaking points. We demonstrate how a novel inner-outer control design technique can help obtain reasonable properties simultaneously at the error and plant input/controls. Specifically, we show how inner-loop controller affects the robustness margins, and hence affect the sensitivity properties of the system. A new controller structure is proposed that includes a lag network in series with the traditional inner and outer controllers [18], [20], typically used in grid current feedback control, presenting a systematic approach for designing more robust active damping strategies. Further, we present a generalized H∞ mixed-sensitivity framework for designing hierarchical inner-outer loop control systems, that helps directly address closed-loop properties at multiple loop-breaking points. We show how an 'equilibrated' design can be obtained by trading off properties at these multiple loop-breaking points.

Original languageEnglish (US)
Title of host publication2018 Annual American Control Conference, ACC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages6766-6771
Number of pages6
Volume2018-June
ISBN (Print)9781538654286
DOIs
StatePublished - Aug 9 2018
Event2018 Annual American Control Conference, ACC 2018 - Milwauke, United States
Duration: Jun 27 2018Jun 29 2018

Other

Other2018 Annual American Control Conference, ACC 2018
CountryUnited States
CityMilwauke
Period6/27/186/29/18

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Sarkar, A., Puttannaiah, K., & Rodriguez, A. (2018). Inner-Outer Loop based Robust Active Damping for LCL Resonance in Grid-Connected Inverters using Grid Current Feedback. In 2018 Annual American Control Conference, ACC 2018 (Vol. 2018-June, pp. 6766-6771). [8431285] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.23919/ACC.2018.8431285