یک طرح اصلاح شده جهت هماهنگی رلهها در شبکههای توزیع با در نظر گرفتن معیار پایداری گذرا
الموضوعات :فرزاد حاجی محمدی 1 , محمد رضا اسماعیلی 2 , غضنفر شاهقلیان 3 , جواد فیض 4
1 - شرکت اختر برق اصفهان، اصفهان، ایران
2 - شرکت برق منطقه ای اصفهان، اصفهان، ایران|دانشکده مهندسی برق، دانشگاه صنعتی قم، قم، ایران
3 - دانشکده مهندسی برق، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
4 - گروه مهندسی برق و کامپیوتر، دانشکده فنی دانشگاه تهران، تهران، ایران
الکلمات المفتاحية: شبکه توزیع, تولیدات پراکنده مبتنی بر ژنراتور سنکرون, هماهنگی حفاظتی, پایداری گذرا,
ملخص المقالة :
توجه به مسائل زیست محیطی و استفاده از منابع انرژی سبز، منجر به افزایش اتصال تولیدات پراکنده به شبکه قدرت الکتریکی شده است. در کنار مزایای متعدد، این تولیدات چالشهایی به سیستم الکتریکی تحمیل میکنند. دو چالش عمده که در این مقاله مورد بررسی قرار میگیرد مربوط به تاثیر تولیدات پراکنده بر روی هماهنگی تجهیزات حفاظتی و پایداری گذرای این منابع در زمان وقوع خطا است. به طور ویژه برای تولیدات پراکنده مبتنی بر ژنراتور سنکرون، چالش هماهنگی حفاظتی ناشی از سهم جریان تزریقی این منابع در شرایط خطا بوده و چالش پایداری گذرا به دلیل ثابت اینرسی پایین میباشد. در روش پیشنهادی به کمک شیفت منحنی مشخصه رله به سمت پائین و قرار گرفتن مجدد منحنی زیر مقدار زمان بحرانی رفع خطا، نه تنها هماهنگی بین تجهیزات حفاظتی بهبود پیدا خواهد کرد؛ بلکه از ناپایدار شدن تولیدات پراکنده مبتنی بر ژنراتور سنکرون نیز جلوگیری میشود. در این مقاله یک منحنی مشخصه زمان - جریان - ولتاژ اصلاح شده برای رلهها ارائه میگردد. نتایج شبیهسازهای انجام شده با نرم افزار ETAP، عملکرد موثر روش پیشنهادی را تائید میکند.
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