Stepwise inertial control of a doubly-fed induction generator to prevent a second frequency dip

Mose Kang, Jinsik Lee, Kyeon Hur, Sang Ho Park, Youngdo Choy, Yong Cheol Kang

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


To arrest a frequency nadir, a stepwise inertial control (SIC) scheme generates a constant active power reference signal of a wind turbine generator (WTG) immediately after a disturbance and maintains it for the predetermined time. From that point, however, the reference of a WTG abruptly decreases to restore the rotor speed for the predefined period. The abrupt decrease of WTG output power will inevitably cause a second frequency dip. In this paper, we propose a modified SIC scheme of a doubly-fed induction generator (DFIG) that can prevent a second frequency dip. A reference value of the modified SIC scheme consists of a reference for the maximum power point tracking control and a constant value. The former is set to be proportional to the cube of the rotor speed; the latter is determined so that the rotor speed does not reach the minimum operating limit by considering the mechanical power curve of a DFIG. The performance of the modified SIC was investigated for a 100 MW aggregated DFIG-based wind power plant under various wind conditions using an EMTP-RV simulator. The results show that the proposed SIC scheme significantly increases the frequency nadir without causing a second frequency dip.

Original languageEnglish
Pages (from-to)2221-2227
Number of pages7
JournalJournal of Electrical Engineering and Technology
Issue number6
Publication statusPublished - 2015 Nov

Bibliographical note

Publisher Copyright:
© The Korean Institute of Electrical Engineers.

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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