Control strategy to mitigate the impact of reduced inertia due to doubly fed induction generators on large power systems

Durga Gautam, Lalit Goel, Raja Ayyanar, Vijay Vittal, Terry Harbour

Research output: Contribution to journalArticle

237 Scopus citations

Abstract

The present work is based on developing a control strategy to mitigate the impact of reduced inertia due to significant DFIG penetration in a large power system. The paper aims to design a supplementary control for the DFIG power converters such that the effective inertia contributed by these wind generators to the system is increased. The paper also proposes the idea of adjusting pitch compensation and maximum active power order to the converter in order to improve inertial response during the transient with response to drop in grid frequency. Results obtained on a large realistic power system indicate that the frequency nadir following a large power impact in the form of generators dropping out is effectively improved with the proposed control strategy. The proposed control is also validated against the sudden wind speed change in the form of wind gust downs and wind ramp downs occurring in conjunction with the generators dropping out. A beneficial impact in terms of damping power system oscillations is also observed, which is validated by eigenvalue analysis. The affected mode is then excited with a large disturbance in time domain. The damping improvement observed in time domain and subsequent Prony analysis support the result obtained from eigenvalue analysis.

Original languageEnglish (US)
Article number5508309
Pages (from-to)214-224
Number of pages11
JournalIEEE Transactions on Power Systems
Volume26
Issue number1
DOIs
StatePublished - Feb 1 2011

Keywords

  • Doubly fed induction generator
  • frequency response inertia
  • transient stability
  • wind turbine generators

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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