روشی نوین جهت تشخیص خطای خط به زمین در ریزشبکه‌های جریان مستقیم با استفاده از تغییرات توان لحظه‌ای
محورهای موضوعی : مهندسی برق و کامپیوتر
سعید عباسی
1
,
نوید غفارزاده
2
1 - دانشگاه بین المللی امام خمینی (ره)
2 - دانشگاه بین‌المللی امام خمینی
کلید واژه: ریزشبکه DCحفاظت غیر- واحدخطای خط به زمینتغییرات توان لحظه‌ایتشخیص خطا,
چکیده مقاله :
با گسترش بارهای حساس همانند مراکز داده، استفاده از ریزشبکه‌های DC افزایش یافته است. خطای خط به زمین رایج‌ترین نوع خطا در این نوع ریزشبکه‌هاست که سبب خسارت‌های مختلفی به ریزشبکه DC می‌گردد. یکی از مهم‌ترین چالش‌ها در بهره‌برداری از ریزشبکه DC، نبود حفاظت مؤثر در برابر این نوع از خطا است. در این مقاله با استفاده از اندازه‌گیری‌های محلی همانند ولتاژ و جریان در ابتدای هر خط به بررسی تغییرات توان لحظه‌ای در آنها پرداخته و یک طرح حفاظتی نوین که مبتنی بر هیچ گونه خط ارتباطی نیست، ارائه می‌شود. طرح حفاظتی پیشنهادی از دقت و سرعت عملکرد خوبی برخوردار بوده و قادر است خطای خط به زمین را در ریزشبکه جریان مستقیم با سرعت بالایی تشخیص دهد. صحت و دقت طرح حفاظتی در شرایط مختلف مورد آزمایش قرار گرفته است.
With the increasing of sensitive loads such as data centers, the use of DC microgrids has increased. Line to ground fault is the most common type of fault in this type of microgrid, which causes various damages to the DC microgrid. One of the most important challenges in operating a DC microgrid is the lack of effective protection against this faults type. In this paper, by using local measurements such as voltage and current at the beginning of each line, the instantaneous power changes in them are computed and a new protection scheme that is not based on any communication line is presented. The proposed protection scheme has good accuracy and speed of operation and is able to detect line-to-ground faults in DC microgrids with high-speed. The accuracy and precision of the protection scheme has been tested under different conditions.
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