روش حفاظت هماهنگ بر مبنای کنترل امپدانس مجازی برای ریزشبکه‌های حلقوی

روش‌های هوشمند در صنعت برق

دوره 12، شماره 46، شهریور 1400، صفحه 15-32   

نوع مقاله: مقاله پژوهشی

نویسندگان

حامد کریمی¹؛ بهادر فانی^{* 1}؛ غضنفر شاهقلیان²

¹دانشکده مهندسی برق- واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران

²مرکز تحقیقات ریز شبکه های هوشمند- واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران

چکیده

حضور منابع تولید پراکنده اینورتری در سیستم‌های قدرت در مقابل مزایای متعدد آن، می‌تواند باعث ایجاد عدم هماهنگی در عملکرد سیستم حفاظتی گردد. در این مقاله یک راه‌ کار مناسب، مستقل از تنظیمات رله‌ها، به منظور حل مشکلات حفاظتی ریزشبکه‌های جزیره‌ای اینورتری با آرایش حلقوی ارائه گردیده است. حضور منابع تولید پراکنده اینورتری، تغییر جهت و دامنه‌ی جریان خطا در سطح ریزشبکه را موجب می‌شود. این مساله در ریزشبکه‌ها با آرایش حلقوی بیشتر به چشم می‌خورد. بنابراین طرح‌های حفاظتی متداول که یک مسیر واحد و یک سطح جریان خطای بالا را در مقایسه با جریان بار در نظر می‌گیرند، ممکن است دچار مشکل ‌شوند. یک عامل مهم برای طراحی مناسب یک سیستم حفاظتی برای ریزشبکه‌ها، سهم جریان خطای تزریقی منابع اینورتری است. در این مقاله استراتژی حفاظت بر مبنای کنترل اینورتر منابع ارائه می‌گردد و از رله‌های اضافه جریان معمولی با منحنی مشخصه‌ی یکسان استفاده شده است. هنگامی که یک خطای اتصال کوتاه در ریزشبکه رخ دهد، یک استراتژی محدود کننده جریان وفقی با استفاده از حلقه امپدانس مجازی اعمال می-گردد. در این حالت سهم جریان خطای هر منبع با توجه به موقعیت خطا کنترل می‌شود و منابع نزدیکتر به خطا جریان خطای بزرگتری تولید می‌کنند. بنابراین جریان عبوری از تجهیزات حفاظتی نزدیکتر به خطا بیشتر از سایر تجهیزات موجود در ریزشبکه می‌شود و بدون نیاز به برقراری ارتباط بین تجهیزات حفاظتی هماهنگی حفاظتی تضمین می‌شود.

کلیدواژه‌ها

رله اضافه جریان؛ ریزشبکه حلقوی؛ منابع تولید پراکنده؛ هماهنگی حفاظتی

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