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
    • GREEN
    • ENERGY


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