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

Eduard Muljadi, Min Hwang, Jung-Wook Park, Poul Sorensen, Yong Kang

Research output: Contribution to journalArticlepeer-review

120 Scopus Citations

Abstract

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 languageAmerican English
Pages (from-to)924-933
Number of pages10
JournalIEEE Transactions on Sustainable Energy
Volume7
Issue number3
DOIs
StatePublished - 2016

NREL Publication Number

  • NREL/JA-5D00-65517

Keywords

  • dynamic droop
  • frequency nadir
  • inertial control
  • rate of change of frequency
  • wind generator

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