Dynamic Droop-Based Inertial Control of a Doubly-Fed Induction Generator

Min Hwang, Eduard Muljadi, Jung-Wook Park, Poul Ejnar Sørensen, Yong Cheol Kang

Research output: Contribution to journalJournal articleResearchpeer-review


If a large disturbance occurs in a power grid, two auxiliary loops for the inertial control of a wind turbine generator have been used: droop loop and rate of change of frequency (ROCOF) loop. Because their gains are fixed, difficulties arise in determining them suitable for all grid and wind conditions. This paper proposes a dynamic droop-based inertial control scheme of a doubly-fed induction generator (DFIG). The scheme aims to improve the frequency nadir (FN) and ensure stable operation of a DFIG. To achieve the first goal, the scheme uses a droop loop, but it dynamically changes its gain based on the ROCOF to release a large amount of kinetic energy during the initial stage of a disturbance. To do this, a shaping function that relates the droop to the ROCOF is used. To achieve the second goal, different shaping functions, which depend on rotor speeds, are used to give a large contribution in high wind conditions and prevent over-deceleration in low wind conditions during inertial control. The performance of the proposed scheme was investigated under various wind conditions using an EMTP-RV simulator. The results indicate that the scheme improves the FN and ensures stable operation of a DFIG.
Original languageEnglish
JournalIEEE Transactions on Sustainable Energy
Issue number3
Pages (from-to)924-933
Publication statusPublished - 2016


  • Renewable Energy, Sustainability and the Environment
  • Dynamic droop
  • frequency nadir
  • inertial control
  • rate of change of frequency
  • wind turbine generator
  • Electric fault currents
  • Electric generators
  • Electric power system control
  • Electric power transmission networks
  • Kinetic energy
  • Kinetics
  • Turbogenerators
  • Wind turbines
  • Doubly fed induction generator (DFIG)
  • Doubly fed induction generators
  • Frequency nadirs
  • Inertial controls
  • Large disturbance
  • Low wind conditions
  • Rate of change of frequencies
  • Stable operation
  • Asynchronous generators


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