هماهنگی تطبیقی فیوز و ریکلوزر در سیستمهای توزیع با ضریب نفوذ بالای منابع فتوولتاییک
محورهای موضوعی : انرژی های تجدیدپذیر
فرزاد حاجی محمدی
1
(دانشجوی کارشناسی ارشد، مرکز تحقیقات ریز شبکه های هوشمند، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران)
بهادر فانی
2
(استادیار، مرکز تحقیقات ریز شبکه های هوشمند، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران)
کلید واژه: سیستمهای توزیع, هماهنگی تطبیقی فیوز و ریکلوزر, منابع فتوولتاییک,
چکیده مقاله :
استفاده از تولیدات پراکنده فتوولتاییک در سیستم توزیع باعث بهبود پروفایل ولتاژ شبکه، بهبود کیفیت توان و ... می‌گردد. اما از طرف باعث ایجاد عدم هماهنگی حفاظتی بین فیوز و ریکلوزر می‌شود. در این مقاله یک روش تطبیقی به منظور حفظ هماهنگی فیوز - ریکلوزر ارائه شده است. این روش بر اساس اصلاح تطبیقی منحنی عملکرد سریع ریکلوزر متناسب با نسبت حداکثر خطای عبوری از فیوز شاخه خطا به ریکلوزر ابتدای خط می‌باشد. به کمک روش ارائه شده در لحظه وقوع خطا متناسب با ضریب نفوذ منابع فتوولتاییک، شاخص هماهنگی زمانی تعیین می‌گردد و سپس بر اساس این شاخص، ضریب تنظیم زمانی عملکرد سریع ریکلوزر به صورت تطبیقی اصلاح می‌شود و در نهایت زمان جدید زمان قطع ریکلوزر به منظور حفظ فیوز در این شرایط محاسبه می گردد. نتایج شبیه‌سازی بیانگر توانایی روش ارائه شده پیشنهادی در سناریو‌های متفاوت خطا، تغییرات ضریب نفوذ منابع فتوولتاییک و مقاومت‌های خطای متفاوت می‌باشد.
Employment of photovoltaic (PV) distributed Generation in the distribution system, leads to improvement of network voltage profile and power quality. On the other hand, it cause miscoordination between fuses and recloser. In this paper an adaptive method is presented to maintain coordination between fuse and recloser. This method is based on a modification of fast operation curve of recloser, proportional to the lateral fuse maximum fault current to recloser current which is located at the beginning of the feeder. Simulation results show the performance of the proposed methods for different fault scenarios, variation of PV penetration and different fault resistance. Based on the presented method, proportional to PVs penetration the protection coordination index (PCI) determined in fault period. Then, according to this index, time dial setting (TDS) of recloser fast operation modified adaptively. Finally, new recloser trip time calculated in this conditions for fuse saving. Simulation results show the performance of the proposed methods for different fault scenarios, variation of PV penetration and different fault resistance.
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