Overcurrent estimation in a doubly-fed induction generator-DC system during a voltage dip in the dc grid

Gil Marques; Matteo Iacchetti

Overcurrent estimation in a doubly-fed induction generator-DC system during a voltage dip in the dc grid

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Author(s): Gil Marques ¹ and Matteo Iacchetti ²
- Affiliations: 1: INESC-ID, Instituto Superior Técnico (IST), University of Lisbon, Av. Rovisco Pais, no 1, 1049-001 Lisbon, Portugal ;
  2: School of Electrical and Electronic Engineering, University of Manchester, Manchester, UK
Source: Volume 10, Issue 7, August 2016, p. 1024 – 1032
DOI: 10.1049/iet-rpg.2015.0509 , Print ISSN 1752-1416, Online ISSN 1752-1424

Received 30/10/2015, Accepted 26/02/2016, Revised 20/01/2016, Published 01/08/2016

This study analyses the voltage dip behaviour of the doubly-fed induction generator (DFIG) connected to a common dc link on both the stator and rotor sides, via a diode bridge and a voltage source inverter (VSI), respectively. After a voltage dip in the dc grid, the rotor VSI can transiently lose control so that rotor currents circulate through the VSI free-wheeling diodes. However, during the uncontrolled period, both stator and rotor voltages are clamped to the same dc-link voltage and no rotor overvoltage occurs. In order to analyse the behaviour of the system during the first periods of the uncontrolled current transients, this study presents a simplified average model which is validated through simulations. Voltage dips are classified into three types depending on their severity. A simple analytical expression is derived for the maximum amplitude of the current during the voltage dip, and an overcurrent chart in the plane ‘rotor speed – dip amplitude’ is deduced. These results provide deep insight into the DFIG-DC system behaviour and are useful for design purpose.

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Overcurrent estimation in a doubly-fed induction generator-DC system during a voltage dip in the dc grid

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