هماهنگی بهینه رله‌های اضافه‌جریان با درنظرگرفتن جریان‌های گذرای ژنراتورها

نوع مقاله: علمی-پژوهشی

نویسندگان

1 دانشکده مهندسی برق - دانشگاه شهید بهشتی - تهران

2 دانشکده مهندسی برق - دانشگاه شهید بهشتی

چکیده

جریان اتصال‌کوتاه در هر شبکه‌ای شامل جریان‌های حالت ماندگار و حالت گذرا است. در روش متعارف هماهنگی رله‌ها، از مولفه گذرای جریان صرف‌نظر می‌شود و رله‌ها براساس جریان‌های ثابت هماهنگ می‌گردند. مولفه گذرای جریان می‌تواند سبب عمل‌کرد سریع‌تر رله‌ها و درنتیجه به‌وجودآمدن ناهماهنگی بین رله‌های اصلی و پشتیبان شود. در این مقاله روشی جهت هماهنگی رله‌ها با درنظرگرفتن مولفه گذرای جریان اتصال‌کوتاه ارائه می‌شود. جهت مدل‌سازی تأثیر مولفه گذرای جریان اتصال‌کوتاه از مدل دینامیکی رله‌های معکوس زمانی استفاده می‌شود. در این روش به محاسبه TSM و Ip  رله‌ها با رعایت قیود هماهنگی پرداخته می‌شود. نشان داده خواهدشد که با وارد‌کردن Ip به مسئله بهینه‌سازی، تابع هدف کاهش می‌یابد ولی ناهماهنگی بین رله‌ها به‌دلیل وجود مولفه گذرای جریان افزایش می‌یابد. جهت ایجاد هماهنگی بین رله‌ها از الگوریتم بهینه‌سازی ژنتیک بهره گرفته شده‌است. روش پیشنهادی و روش متعارف هماهنگی هم روی شبکه شعاعی و هم شبکه حلقوی پیاده‌سازی می‌شوند.


 

کلیدواژه‌ها


عنوان مقاله [English]

Optimal Coordination of Overcurrent Relays Considering Generators Transient Currents

نویسندگان [English]

  • M. Ghotbi Maleki 1
  • R. Mohammadi 2
  • H. Javadi 2
1 Faculty of Electrical and Computer Engineering, University of Shahid Beheshti, Tehran, Iran
2 Faculty of Electrical and Computer Engineering, University of Shahid Beheshti, Tehran, Iran
چکیده [English]

Short-circuit current in the power networks, consists of steady and transient states. In the conventional relay coordination method, the transient component of short-circuit current is ignored and the relays are coordinated via fixed currents. The transient component of short-circuit currents causes relays operate fast and thus miscoordinations appear between the main and backup pair relays. In this paper, a relay coordination method considering the transient component of short-circuit current is presented. Dynamic model of inverse time overcurrent relay is used to calculate operating time of relays. In the proposed method, both TSM and Ip < /sub> of relays are calculated considering coordination constraints. It is shown that when the Ip < /sub> is entered to the optimization problem, the objective function is reduced but miscoordinations between relays are increased because of the transient component of short-circuit current. Genetic optimization algorithm is used for relays coordination. The proposed coordination method is implemented on a radial and a meshed network, and the results are compared with the conventional method of coordination.

کلیدواژه‌ها [English]

  • directional overcurrent relay
  • distributed generation (DG)
  • inverse time relay’s dynamic model
  • genetic algorithm
  • protection coordination
  • transient currents
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