یک روش تطبیقی جدید برای حفاظت از شبکه توزیع با ضریب نفوذ بالای تولیدات پراکنده

نوع مقاله : علمی-پژوهشی

نویسندگان

1 مرکز تحقیقات ریز شبکه‌های هوشمند - واحد نجف‌آباد - دانشگاه آزاد اسلامی

2 دانشکده مهندسی برق - واحد نجف‌آباد - دانشگاه آزاد اسلامی

چکیده

رشد سریع منابع تولید پراکنده در شبکه‌های توزیع منجربه ایجاد چالش‌های جدیدی در هماهنگی حفاظتی رله‌های اضافه جریان شده‌است. تاکنون، روش‌های تطبیقی مختلفی به‌منظور حل مشکل ناهماهنگی منابع تولید پراکنده ارائه شده‌است، اما با این وجود، ضریب نفوذ غیرقابل پیش‌بینی منابع DG نصب‌شده، اهمیت یک روش مستقل از ضریب نفوذ را برجسته می‌کند. این مطالعه یک راه‌کار آفلاین، سریع، عملیاتی و ارزان‌قیمت را ارائه می‌دهد که هماهنگی حفاظتی را در هر ضریب نفوذ و مکان منابع DG تضمین می‌کند. به این منظور، در ابتدا، در ضریب نفوذها و مکان‌های مختلف منابع DG، عمل‌کرد سیستم حفاظتی سنتی موردمطالعه قرار می‌گیرد که بدترین حالات ناهماهنگی مشخص شود. سپس، باتوجه‌به استانداردهای رله‌ها، منحنی مشخصه حفاظت پشتیبان به‌نحوی اصلاح می‌گردد که بتواند هماهنگی را در بدترین حالات حفظ کند. راه‌کار پیشنهادی برروی یک شبکه توزیع که به تعداد زیادی DG مجهز است، اعمال شده‌است. نتایج با موفقیت کارایی روش پیشنهادی را اثبات می‌کند. این حقیقت این روش را یک گزینه جذاب برای شبکه‌های توزیع همراه با منابع DG می‌کند.

کلیدواژه‌ها

عنوان مقاله [English]

A New Adaptive Method for Protection of Distribution System with High Penetration of Distributed Generations

نویسندگان [English]

  • H. Bisheh 1
  • B. Fani 2
  • G. Shahgholian 2
1 Smart Microgrid Research Center, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
چکیده [English]

The rapid growth of distributed generations (DG) in distribution grids brings new challenges in the protection coordination of overcurrent relays. So far, various adaptive techniques have been addressed to solve DG units’ mis-coordination problem, however, the un-predictable penetration of installed DG units highlights the importance of a penetration-free methodology. This study presents a novel offline, quick, applicable and cheap solution which guarantees protection coordination for any penetration and location of DG units. To do so, first, under different DG penetration levels and locations, the conventional protection performance is studied to discover the worst mis-coordination cases. Next, according to relays standards, the characteristic curve of the back-up relay is modified such that it can maintain coordination in all worst cases. The proposed methodology is applied to a power distribution network equipped with numerous DG units. The results successfully prove the effectiveness of the proposed method. This fact makes this method an attractive option for distribution systems with DG units.

کلیدواژه‌ها [English]

  • Distribution network
  • photovoltaic system
  • coordination of the overcurrent relays
  • penetration of DG

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