استفاده از روش‌هاي حذف بار تركيبي تطبيقي به‌منظور بهبود پايداري ولتاژ سيستم قدرت - قسمت اول: مفهوم كلي و الگوريتم‌ها
الموضوعات :علیرضا صفاریان 1 , مجید صنايع‌پسند 2 , امیر پیروزقلعه 3
1 - دانشگاه تهران
2 - دانشگاه تهران
3 - دانشگاه تهران
الکلمات المفتاحية: افت ولتاژ حاشيه پايداري ولتاژ حذف بار تركيبي تطبيقي حذف بار فركانسي,
ملخص المقالة :
اين مقاله قسمت اول از يك مقاله دوقسمتي است كه در آن چند روش حذف بار تركيبي تطبيقي براي اصلاح روش حذف بار فركانسي متداول به‌منظور بهبود پايداري سيستم قدرت و بالاخص افزايش حاشيه پايداري ولتاژ سيستم پس از وقوع حوادث شديد پيشنهاد مي‌گردد. امروزه با گسترش شبکه‌هاي قدرت و خصوصي‌سازي و رقابتي‌شدن صنعت برق، حاشيه امنيت شبکه‌ها در مقابل انواع ناپايداري کاهش يافته است. در اين شرايط روش‌هاي حفاظتي متداول خصوصاً در حوادث تركيبي نمي‌توانند به‌خوبي از شبكه در برابر ناپايداري محافظت كنند. در برخی از این حوادث با وجود این که روش‌هاي حفاظتي متداول فركانس سیستم را به محدوده مجاز باز مي‌گردانند، نهایتاً سيستم بر اثر افت ولتاژهاي شدید دچار ناپایداری ولتاژ مي‌گردد. در برخي حوادث ديگر افت ولتاژ شدید باعث اختلال در عملکرد رله‌های فرکانسی مي‌گردد. در اين مقاله سه روش حذف بار تركيبي تطبيقي براي مقابله با اين‌گونه حوادث پيشنهاد شده است. اين روش‌ها بر اساس اطلاعات محلي اندازه ولتاژ و فرکانس و بدون نياز به ارتباط مخابراتي عمل مي‌كنند. در الگوريتم‌هاي پيشنهادشده، حذف بار از نقاط با افت ولتاژ بيشتر و طولاني‌تر در حين افت فركانس آغاز مي‌گردد و سرعت، محل و مقدار حذف بار بسته به محل وقوع حادثه و وضعيت ولتاژي سيستم و نرخ افت فركانس به‌طور تطبيقي تغيير مي‌كند. در قسمت دوم مقاله، نتايج عددي شبيه‌سازي روش متداول و روش‌هاي پيشنهادي در يك شبكه بزرگ و واقعي ارائه شده و عملكرد اين روش‌ها به‌ازاي حوادث مختلف مورد بررسي قرار گرفته است.
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