Providing ride-through capability to a doubly fed induction generator under unbalanced voltage dips Articles uri icon

publication date

  • July 2009

start page

  • 1747

end page

  • 1757

issue

  • 7

volume

  • 24

International Standard Serial Number (ISSN)

  • 0885-8993

Electronic International Standard Serial Number (EISSN)

  • 1941-0107

abstract

  • This paper analyzes the effect of unbalanced voltage over doubly fed induction generators (DFIGs) and presents a novel control strategy, named dynamic programming power control plus (DPPC+), based on dynamic programming control. The high penetration of wind energy in the electrical grids demands for new requirements for the operation of wind energy conversion systems (WECSs). DFIG is the most employed WECS, and the DPPC+ guarantees their operation under unbalance conditions achieving the required objectives. Although the technique can be implemented to control both rotor and grid converters, we hereby expound the former, which regulates stator active and reactive power. The validation of the results obtained with DPPC+ has been performed through the use of experimental tests on a 20-kW test bench, consisting of a DFIG and induction motor drive. The obtained results show that the DPPC+ is suitable for achieving a good dynamic response while controlling current distortion and power and/or torque oscillations for both steady-state conditions and unbalanced voltage dips, showing the low-voltage ride-through capability.

keywords

  • doubly fed induction generator (dfig); dynamic programming power control plus (dppc$+$); unbalanced voltage; voltage dip