Digital Application of Second Order Generalized Integrator Based Grid Estimator Under Unbalanced and Distorted Voltage Conditions

Emre Ozsoy, Padmanaban Sanjeevikumar, Frede Blaabjerg, Pierluigi Siano, Fiaz Ahmad, Akhtar Rasool, Asif Sabanovic

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Frequency, amplitude, and phase information of the grid voltage are the main constraints for constructing a robust controller algorithm for grid connected applications under unbalanced and distorted voltage conditions. This paper narrates a simple, robust, straight forward method to estimate the instantaneous positive and negative sequence voltage components under unbalanced and distorted voltage circumstances. A second order generalized integrator (SOGI) is encapsulated to filter out the distorted voltage as well as to generate orthogonal voltage components for the three phases of AC grid. Furthermore, these filtered and orthogonal components are accounted for the calculation of instantaneous symmetrical components. Developed technique is more frequency adaptive compared to conventional phase locked loop (PLL) techniques. A set of test outcome results are provided in this paper based on MATLAB/Simulink simulations with real grid data captured from an industrial plant. Moreover, SOGI based estimator is digitally implemented by using dSPACE ds1103 digital controller to validate the numerical simulation results in accordance with the developed theoretical prediction.
Original languageEnglish
JournalElectric Power Components & Systems
Volume47
Issue number16-17
Pages (from-to)1464-1474
Number of pages11
ISSN1532-5008
DOIs
Publication statusPublished - Dec 2019

Keywords

  • second order generalized integrator
  • positive and negative sequence components
  • inbalnaced and distorted voltage

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