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Adaptive method for control tuning of grid-connected inverter based on grid measurements during start-up

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

Details

Original languageEnglish
Title of host publicationEuropean Control Conference (in cooperation with IFAC) - ECC 2019
Subtitle of host publicationJun 25-28, Naples, Italy
PublisherIEEE
Pages417-422
ISBN (Electronic)978-3-907144-00-8
ISBN (Print)978-1-7281-1314-2
DOIs
Publication statusAccepted/In press - 20 Feb 2019
Publication typeA4 Article in a conference publication
EventEuropean Control Conference - Naples, Italy
Duration: 25 Jun 201928 Jun 2019

Conference

ConferenceEuropean Control Conference
CountryItaly
CityNaples
Period25/06/1928/06/19

Abstract

As the share of grid-connected converters increases, potential stability issues in the grid interface of the converters are emphasized. Impedance-based stability criterion can be used to assess the stability of the interface accurately, and the grid conditions should be considered in control design of the converter. However, the grid impedance is often an unknown parameter, and thus, adaptive control is a favorable method for addressing the uncertainties in the control design. This work presents an algorithm, in which the full-order grid impedance is measured during the start-up of the device, and control bandwidth of phase-locked loop and grid-voltage feedforward gains are adjusted to optimize sensitivity function in the grid interface, based on generalized Nyquist criterion. The method can ensure robust control in weak grid conditions, while still achieving good control performance in strong grids. The method is verified with power hardware-in-the-loop experiments with a kW-scale grid-connected three-phase inverter.

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