ارزیابی قابلیت اطمینان سیستم قدرت با در نظر گرفتن عدم هماهنگی سیستم حفاظتی ناشی از تغییر ساختار

نوع مقاله : علمی-پژوهشی

نویسندگان

1 برق قدرت، دانشکده مهندسی برق و کامپیوتر، دانشگاه بیرجند، شهر بیرجند، ایران

2 برق قدرت؛ دانشکده مهندسی برق و کامپیوتر؛ دانشگاه بیرجند: بیرجند: ایران

3 برق قدرت، مهندسی برق، دانشگاه زنجان، زنجان، ایران

چکیده

عملکرد سیستم‌های حفاظتی نقش مهمی در قابلیت اطمینان سیستم‌های قدرت دارد. خرابی و عملکرد نادرست سیستم‌های حفاظتی باعث خروج تجهیزات سالم و به دنبال آن خروج بارهای شبکه و خاموشی می‌شود. تغییر ساختار و یا خروج تجهیزات شبکه یکی از عوامل تأثیرگذار بر عملکرد سیستم‌های حفاظتی در هنگام وقوع خطا است. تغییر ساختارناشی از خروج برنامه ریزی شده و برنامه ریزی نشده تجهیزات سیستم قدرت و تغییرات دینامیکی ساختار، موجب تغییر سطح اتصال کوتاه و جریان‌های خطا می‌شود. تغییر سطح اتصال کوتاه بر روی عملکرد رله‌های حفاظتی تاثیر گذاشته و می‌تواند باعث عدم هماهنگی سیستم حفاظتی شود و در نتیجه منجر به خروج بعضی از بارها و کاهش قابلیت اطمینان سیستم قدرت گردد. این مقاله مدل مارکوف جدیدی به منظور مدلسازی خرابی و عدم هماهنگی سیستم‌های حفاظتی ناشی از خروج تجهیزات پیشنهاد کرده است. همچنین شاخص جدیدی جهت تعیین میزان عدم هماهنگی سیستم‌های حفاظتی معرفی شده است. با استفاده از روش مونت کارلوی ترتیبی، مدل مارکوف ارائه شده بر روی شبکه 24 باسه IEEE RTS پیاده‌سازی شده است. شاخص‌های قابلیت اطمینان نظیر احتمال قطع بار (LOLP)، متوسط خروج بار (LOLE)، متوسط تعداد قطع بار (EFLC( و متوسط انرژی تأمین نشده (EENS) برای چهار سناریو با سطوح عدم هماهنگی مختلف به دست آمده است. مقایسه نتایج نشان می‌دهد که چگونه عدم هماهنگی سیستم حفاظتی شاخص‌های قابلیت اطمینان را کاهش می‌دهد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Power System Reliability Evaluation Considering Protection Miscoordination due to Topology Change

نویسندگان [English]

  • saeed sabzebin 1
  • Abbas Saberi Noghabi 2
  • Kazem Mazlumi 3
1 Department of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
2 Department of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
3 Department of Electrical Engineering, University of Zanjan, Zanjan, Iran
چکیده [English]

Protection system operation has a vital role in power system reliability. The protection system failure and incorrect operation may cause cascading outages. In case of fault, one of the effective causes of protection system mal-operation is the change in network topology. Network topology changes due to scheduled and unscheduled outages of power system components and dynamic changes in topology cause a change in the short circuit current of the network. The change in short circuit current affects protection relay operation and can lead to protection miscoordination which results in an outage of some loads and degradation of power system reliability indices. This paper proposes a novel Markov model including the miscoordination of the protection system due to component outages. In addition, a new index is proposed for protection miscoordination. A sequential Monte Carlo simulation approach is used to implement the proposed Markov model on a 24-bus IEEE reliability test system. The reliability indices, such as loss of load probability (LOLP), loss of load expectation (LOLE), expected frequency of load curtailment (EFLC), and expected energy not supplied (EENS), are obtained for four scenarios with different miscoordination levels and compared to show how the protection miscoordination degrades the reliability indices.

کلیدواژه‌ها [English]

  • Power system reliability
  • Markov chain Monte Carlo
  • protection failure
  • protection miscoordination

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