An algorithm for reduction of extracted power from photovoltaic strings in grid-tied photovoltaic power plants during voltage sags

Hossein Dehghani Tafti, Ali Iftekhar Maswood, Josep Pou, Georgios Konstantinou, Vassilios Agelidis

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Due to the high penetration of the installed distributed generation units in the power system, the injection of reactive power is required for the medium-scale and large-scale grid-connected photovoltaic power plants (PVPPs). Because of the current limitation of the grid-connected inverter, the injected active power should be reduced during voltage sags. In order to obtain a constant dc-link voltage in a multi-string PVPP, the extracted power from PV strings should be equal to the injected power to the grid in all operating conditions (excluding power losses). Therefore, the extracted power of PV strings should be reduced during voltage sags. In this paper, an algorithm is proposed for determining the reference voltage of the PV string which results in a reduction of the output power to a certain amount. The proposed algorithm calculates the reference voltage for the dc/dc converter controller, based on the characteristics of the power-voltage curve of the PV string and therefore, no modification is required in the the controller of the dc/dc converter. Simulation results on a 50-kW PV string verified the effectiveness of the proposed algorithm in reducing the power from PV strings under different irradiation and reference power values.
Original languageEnglish
Title of host publicationProceedings of 42nd Conference of the Industrial Electronics Society
PublisherIEEE
Publication date2016
Pages3018-3023
ISBN (Print)9781509034741
DOIs
Publication statusPublished - 2016
Event42nd Annual Conference of the IEEE Industrial Electronics Society - Palazzo dei Congressi Piazza Adua, Florence, Italy
Duration: 23 Oct 201626 Oct 2016

Conference

Conference42nd Annual Conference of the IEEE Industrial Electronics Society
LocationPalazzo dei Congressi Piazza Adua
CountryItaly
CityFlorence
Period23/10/201626/10/2016

Keywords

  • Photovoltaic systems
  • Fault-ride through capability
  • Active/reactive power injection
  • dc/dc converter
  • Active power reduction

Cite this

Tafti, H. D., Maswood, A. I., Pou, J., Konstantinou, G., & Agelidis, V. (2016). An algorithm for reduction of extracted power from photovoltaic strings in grid-tied photovoltaic power plants during voltage sags. In Proceedings of 42nd Conference of the Industrial Electronics Society (pp. 3018-3023). IEEE. https://doi.org/10.1109/IECON.2016.7793187