کنترل جریان خطای تولیدات پراکنده مجهز به ژنراتور سنکرون به منظور هماهنگی رله های حفاظتی
محورهای موضوعی : مهندسی برق قدرت
اصلان صانعی
1
,
اسماعیل رک رک
2
,
فرهاد نامداری
3
1 - دانشکده مهندسی برق، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
2 - گروه برق دانشکده فنی و مهندسی برق، دانشگاه لرستان، لرستان، ایران
3 - گروه برق دانشکده فنی و مهندسی برق، دانشگاه لرستان، لرستان، ایران
کلید واژه: رله‌های اضافه جریان, تولید پراکنده, تپ‌چنجر ترانسفورماتور, ژنراتور سنکرون,
چکیده مقاله :
حضور گسترده تولیدات پراکنده (DG) با بالا بردن سطح اتصال کوتاه، باعث از بین رفتن هماهنگی ادوات حفاظتی در سیستم توزیع می‌شود. با توجه به این که DGهای از نوع ماشین سنکرون (SMDG) بیشترین مشکل را برای هماهنگی سیستم (رله‌های اضافه جریان) ایجاد می‌کنند؛ در این پایان‌نامه کنترل جریان خروجی ژنراتورهای سنکرون توسط تغییر تپ‌چنجر ترانسفورماتور متصل به آن، هنگام وقوع خطا پیشنهاد شده است. در این روش، مشارکت SMDGها در تغذیه‌ی جریان خطا، با کنترل تپ‌چنجر، محدود می‌شود. قبل از وقوع خطا و متناسب با شرایط سیستم تپ‌چنجر ترانسفورماتور متصل به ژنراتور سنکرون تغییر کرده و باعث کاهش جریان در هنگام بروز خطا می‌شود. روش پیشنهادی روی یک سیستم توزیع نمونه در ETAP پیاده‌سازی شده است؛ نتایج حاصل از شبیه‌سازی کارایی روش پیشنهادی را تأیید می‌کند.
The presence of distributed generation sources (DGs) will affect the extent and duration of system failures. This will inevitably require the need to review the functioning of the system of protection and re-coordination of the relevant equipment. Because the lack of an appropriate coordination between the DG units connected to a distribution system could lead to the exchange of power between these units and the system's instability, improper operation of the system of protection or the unintended islanding of a part of the system. Due to the fact that synchronous machine type DGs (SMDGs) are the most problematic for system coordination (over-current relays) than other types of DGs; in this paper, controlling the output current of generators Synchronization is proposed by tap changer of the transformer connected to it. In this method, the SMDG's participation in the flow of error is limited by the control of the pincer. Before the fault occurred and in accordance with the system conditions, the transformer tapping device connected to the synchronous generator has been changed and it reduces the flow during an error. This strategy, in addition to reducing the generation error of the generators and transformer assembly installed as a dispersed generation source, also increases the permeability coefficient of these sources. The proposed technique is implemented on a sample distribution system in the ETAP software; the results of the simulation show the effectiveness of the proposed method.
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