بهبود پایداری ولتاژ در ریزشبکه با استفاده از بهینه‌سازی کنترل محلی
محورهای موضوعی : مهندسی برق و کامپیوتروحید بهرامی فروتن 1 * , محمدحسن مرادی 2 , محمد عابدینی 3
1 - دانشگاه بوعلی سینا
2 - دانشگاه بوعلی سینا
3 - دانشگاه آیت‌الله بروجردی
کلید واژه: اندازه‌گیری‌های ناحیه گسترده تدابیر ویژه حفاظتی تخمین پایداری گذرا روش تک‌ماشین معادل معیار سطوح برابر,
چکیده مقاله :
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.
Stability challenges in Microgrids (MGs) usually arise from low inertia of Distributed Generation (DG). In this paper, a voltage stability improvement method is proposed in order to improve MG operation. Voltage Stability Index (VSI) is applied to evaluate and improve voltage stability of MGs including different types of DGs. A new hybrid optimization is introduced to find the optimal operation of autonomous MG and to improve VSI. Operational optimization is performed by finding optimal droop parameters of DGs and sitting wind DGs to reduce energy generation cost. Optimization is defined as a multi-objective function and a hybrid HS-GA algorithm is applied to solve the optimization problem. A new power flow formulation is also proposed in which the steady state frequency, reference frequency, droop coefficients and, reference voltage of droop based DGs are considered as optimization variables. Results of proposed approach are compared with other methods for 33 and 69-bus IEEE systems using MATLAB software. Results prove the efficiency of proposed approach for operational improvement of MGs.
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