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access icon free Transient stability of power system integrated with doubly fed induction generator wind farms

  • Author(s): Md Ayaz Chowdhury 1 ; Weixiang Shen 2 ; Nasser Hosseinzadeh 3 ; Hemanshu Roy Pota 4
    • View affiliations
    • Affiliations: 1: Faculty of Engineering, Computing & Science, Swinburne University of Technology Sarawak Campus, Room #E319, Block E, Jalan Simpang Tiga, Kuching 93350, Sarawak, Malaysia;
      2: Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Melbourne, VIC 3122, Australia;
      3: Department of Electrical and Computer Engineering, Sultan Qaboos University, Muscat 123, Oman;
      4: School of Engineering and Information Technology, The University of New South Wales@ Australian Defence Force Academy, Canberra, ACT 2600, Australia
  • Source: Volume 9, Issue 2, March 2015, p. 184 – 194
    DOI:  10.1049/iet-rpg.2014.0035 , Print ISSN 1752-1416, Online ISSN 1752-1424
© The Institution of Engineering and Technology
Received 28/01/2014, Accepted 16/07/2014, Revised 06/06/2014, Published 10/09/2014

A new quantitative assessment of transient stability for power systems integrated with doubly fed induction generator (DFIG) wind farms is proposed by evaluating the transient energy margin (TEM) through the formulation of the transient energy function (TEF) for multimachine systems. To achieve an accurate TEM, the TEF is modified to account for the separation of the critical machines from the system and an unstable equilibrium point is calculated on the basis of post-fault trajectory reaching the potential energy boundary surface. Simulation results show that such power systems integrated with DFIG wind farms are more sensitive to transient events of higher voltage sag, longer fault clearing time, lower load operation and higher wind power penetration level. It is also observed that machines located far from the fault are also exposed to inferior transient stability because of fault with geographical dispersion of wind farms. As a result, advanced switchgear, faster isolators, more efficient power reserve systems and advanced reactive power compensating devices must be equipped to ensure reliable operation of power systems integrated with the DFIG wind farms during transient events.

Inspec keywords: power supply quality; transient analysis; power system faults; power system transient stability; wind power plants; asynchronous generators

Other keywords: fault clearing time; transient energy margin; DFIG; advanced reactive power compensating device; doubly fed induction generator wind farm; wind farm geographical dispersion; inferior transient stability; TEM; voltage sag; power system transient stability; power system reliability; load operation; wind power penetration level; multimachine system; unstable equilibrium point; postfault trajectory; critical machine separation; transient energy function; power reserve system; TEF; potential energy boundary surface

Subjects: Power supply quality and harmonics; Power system control; Wind power plants; Asynchronous machines

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