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access icon free Hybrid control of DFIGs for short-term and long-term frequency regulation support in power systems

  • Author(s): Kai Liao 1 ; Yan Xu 2 ; Yao Wang 3 ; Pengfeng Lin 2
    • View affiliations
  • Source: Volume 13, Issue 8, 10 June 2019, p. 1271 – 1279
    DOI:  10.1049/iet-rpg.2018.5496 , Print ISSN 1752-1416, Online ISSN 1752-1424
© The Institution of Engineering and Technology
Received 27/06/2018, Accepted 15/02/2019, Revised 24/12/2018, Published 19/02/2019

This paper proposes a new hybrid frequency control strategy for doubly fed induction generator (DFIG)-based wind turbines (WTs) to simultaneously provide short-term and long-term frequency regulation support to the connected power system. The kinetic energy stored in the rotating mass and the mechanical power reserve of the WT are coordinately configured to participate in frequency recovery at both primary and secondary stages. A frequency response model (FRM) is also derived to analyse the mutual interactions between WTs and the power system. Based on the FRM, the impacts of relevant parameter variations on the overall system stability can be investigated through Nyquist criterion and modal analyses and the stable operation range of proposed strategy could be easily identified. Theoretical and numerical results have both verified the effectiveness of the proposed control strategy and its advantages over existing methods.

Inspec keywords: modal analysis; asynchronous generators; frequency control; wind turbines; Nyquist criterion; numerical analysis; power system stability; machine control; power generation control; frequency response

Other keywords: WT; mechanical power reserve; hybrid frequency control strategy; Nyquist criterion; connected power system; kinetic energy storage; wind turbines; long-term frequency regulation support; doubly fed induction generator; frequency recovery; system stability; modal analyses; short-term frequency regulation support; DFIG; frequency response model; FRM

Subjects: Stability in control theory; Wind power plants; Other numerical methods; Power system control; Asynchronous machines; Frequency control; Other numerical methods; Control of electric power systems

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