بهبود پایداری ولتاژ در ریزشبکه با استفاده از بهینه‌سازی کنترل محلی
الموضوعات :
وحید بهرامی فروتن
1
(دانشگاه بوعلی سینا)
محمدحسن مرادی
2
(دانشگاه بوعلی سینا)
محمد عابدینی
3
(دانشگاه آیت‌الله بروجردی)
الکلمات المفتاحية: اندازه‌گیری‌های ناحیه گسترده تدابیر ویژه حفاظتی تخمین پایداری گذرا روش تک‌ماشین معادل معیار سطوح برابر,
ملخص المقالة :
پایداری گذرا یکی از مسایل پراهمیت در بهره‌برداری از سیستم‌های قدرت است و لذا ارزیابی وضعیت پایداری گذرای شبکه امری ضروری است. روش‌های معمول ارزیابی وضعیت پایداری گذرا به صورت آفلاین می‌باشد که بر اساس آن مجموعه‌ای از اقدامات پیش‌گیرانه اتخاذ می‌شود و یا مجموعه‌ای از اقدامات اصلاحی تحت عنوان تدابیر ویژه حفاظتی برای عملکرد در شرایط زمان واقعی طراحی می‌شود. به منظور کاهش ریسک تدابیر اتخاذشده در شرایط زمان واقعی، در این مقاله روشی جدید برای تخمین برخط پایداری گذرا ارائه شده است که بر اساس ترکیب اندازه‌گیری‌های محلی و ناحیه گسترده عمل می‌کند. بر اساس این روش ابتدا سیستم قدرت دوناحیه‌ای با دسته‌بندی ژنراتورهای هم‌نوا و بر اساس روش تک‌ماشین معادل ساده‌سازی شده و سپس از معیار سطوح برابر برای پیش‌بینی پایداری گذرای آن استفاده می‌شود. بر اساس نوآوری روش پیشنهادی، سطح شتاب‌دهنده منحنی توان الکتریکی بر حسب زاویه رتور شبکه تک‌ماشینه معادل در لحظات وقوع خطا از روی سطوح شتاب‌دهنده محاسبه‌شده در هر یک از شین‌های ژنراتوری به صورت محلی محاسبه می‌شود که دقت محاسبات را افزایش می‌دهد. نتایج شبیه‌سازی انجام‌شده بر روی شبکه‌های نمونه 11شینه با چهار ژنراتور سنکرون و 39شینه با 10 ژنراتور سنکرون، کارآمدی روش پیشنهادی را نشان می‌دهد.
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