مروری بر مشخصههای حفاظتی غیراستاندارد به کار رفته در شبکههای توزیع فعال
محورهای موضوعی :
مهندسی برق قدرت
فرزاد حاجی محمدی
1
,
احسان حیدریان فروشانی
2
,
سید فریبرز زارعی
3
,
حسین مختاری
4
1 - شرکت اختر برق اصفهان، اصفهان، ایران
2 - دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی قم، قم، ایران
3 - دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی قم، قم، ایران
4 - دانشکده مهندسی برق، دانشگاه صنعتی شریف، تهران، ایران
تاریخ دریافت : 1401/05/13
تاریخ پذیرش : 1401/09/09
تاریخ انتشار : 1402/03/01
کلید واژه:
ریز شبکه,
تکنیک حفاظتی,
شبکه توزیع,
تولید پراکنده,
چکیده مقاله :
در سالهای اخیر، فرآیند توسعه از سیستمهای قدرت الکتریکی معمولی به شبکههای هوشمند منجر به تعریف و پایهگذاری مفهوم ریزشبکهها (MGs) شده است. در واقع، MG یک ساختار آیندهنگر برای اتصال منابع انرژی تجدیدپذیر، سیستمهای ذخیره انرژی و بارها است. MG را میتوان به عنوان یک شبکه توزیع (DN) محلی شامل تولیدات پراکنده (DGs) خطاب کرد. ادغام چنین منابعی مزایای فراوانی از جمله کاهش تلفات توان، بهبود کیفیت توان و قابلیت اطمینان شبکه و کاهش ازدحام شبکه الکتریکی به همراه دارد. از سوی دیگر، پیکربندی جدید شبکه باعث ایجاد چالشهای متعدد حفاظتی میشود که با طرحهای حفاظتی معمول قابل برطرف کردن نیستند. این مسائل عبارتند از: حرکت توان در دو جهت مختلف، تغییر سطح جریان خطا به دلیل حالتهای مختلف عملکرد شبکه، قطع اشتباه و حفاظت ناحیه کور. بنابراین، طرحهای هماهنگی حفاظتی جدید و کارآمدی برای MGها و DN شامل DGها تعمیم یافته است. این مقاله مروری بر تکنیکهای حفاظتی اعمال شده جهت کاهش تأثیر DGها بر DN را ارائه میکند.
چکیده انگلیسی:
In this paper, the different protection challenges of active distribution networks are reviewed and the conventional and non-conventional schemes are examined. In active distribution networks, due to the presence of distributed generations at different levels of distribution network, the functionality of the conventional protection strategies are partially or totally are affected. Therefore, the protection strategies should be updated, and the conventional protective schemes and characteristics should be changed. In this paper, first, the potential protection issues raised of active distribution networks are reviewed. Among the challenges, the bidirectional flow of the fault current, the increased amplitude of fault current, the dependency of the fault current on the operating point, the reduction of reach of the relays, the blinding of the protective relay, unwanted islanding, and etc. are reviewed. Then, the performance of the conventional protections including fuses, overcurrent relays, reclosers under such conditions has been investigated. Furthermore, the existing modified protection methods in the literature are examined, which are classified into two general categories of (i) protective relays with unconventional characteristics, and (ii) adaptive protective relays. Finally, the studied different methods are compared with each other, and their performance characteristics are evaluated.
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