State observer for sensorless control of a grid-connected converter equipped with an LCL filter: direct discrete-time design

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Research units


Synchronization with the power system is an essential part of control of grid-connected converters. This paper proposes a grid-voltage sensorless synchronization and control scheme for a grid-connected converter equipped with an LCL filter, measuring only the converter currents and the DC voltage. A discrete-time pole-placement design method is used to formulate an adaptive full-order observer for estimation of the angle and magnitude of the grid voltage. The analytically derived design is experimentally validated, and the results demonstrate rapid convergence of the estimated angle and magnitude.


Original languageEnglish
Title of host publicationIEEE Energy Conversion Congress and Expo (ECCE)
Publication statusPublished - 20 Sep 2015
MoE publication typeA4 Article in a conference publication

    Research areas

  • active front-end rectifier, adaptive observer, distributed generation, line-voltage sensorless, small-signal linearization, state feedback, synchronization

ID: 1946152