ارائه یک الگوریتم جدید برای تعیین جهت خطا در خطوط انتقال مبتنی بر بهینه‌سازی حداقل مربعات
محورهای موضوعی : مهندسی برق و کامپیوتر
1 - دانشگاه ایلام
2 - دانشگاه ایلام
کلید واژه: اشباع CT حفاظت دیجیتال رله جهتی مؤلفه توالی مثبت ناحیه مرده,
چکیده مقاله :
با توجه به کاربرد وسیع حفاظت جهتی در شبکه‌های فوق توزیع و انتقال، در این مقاله یک الگوریتم جدید برای تعیین جهت خطا در خطوط انتقال پیشنهاد شده است. این الگوریتم دارای ناحیه مرده نمی‌باشد و همچنین برای انواع خطاهای داخلی و خارجی و بدون توجه به محل خطا نیز به درستی عمل می‌کند. این عملکرد صحیح تحت شرایط خطاهای نزدیک رله نیز صادق است. الگوریتم در تشخیص خطا سریع عمل کرده و جهت درست خطا را در شرایط مختلفی از قبیل اشباع CT، نوسانات توان و وجود منابع قوی و ضعیف تشخیص می‌دهد. همچنین مقاومت خطا و زاویه شروع خطا نیز تأثیری در عملکرد صحیح الگوریتم ندارد. فرکانس نمونه‌برداری پایین الگوریتم پیشنهادی به آن قابلیت پیاده‌سازی صنعتی می‌دهد. جهت ارزیابی الگوریتم، شبیه‌سازی‌ها با استفاده از نرم‌افزار EMTP-RV انجام گرفته است. الگوریتم توسط داده‌های میدانی استخراج‌شده از پستkV 230 مانشت، واقع در استان ایلام نیز اعتبارسنجی شده است. نتایج نشان می‌دهد که الگوریتم پیشنهادی دارای سرعت و قابلیت اطمینان مناسبی می‌باشد.
Directional protection is a crucial function in advanced transmission network relays. In this paper, a novel directional algorithm for transmission line protection is presented. Proposed algorithm responds to all kind of faults accurately without any dead zone. In this scheme, discrimination between internal and external faults will be done precisely even for close relay faults. The proposed algorithm utilizes a close form equation achieved by least squares optimization. Directional protection function is carried out based on proposed algorithm under various conditions such as current transformer saturation, power swing and source capacity changes. Moreover, variation on some parameters such as fault inception and fault resistance has only negligible effects on algorithm performance. Due to employing of low sampling frequency, hardware implementation of the proposed algorithm is not complicated. Algorithm performance is evaluated by applying the field data from Manesht 230kV substation located at Ilam province as well as extracted data form EMTP-RV simulations. Simulation results verify the speed and reliability of the proposed algorithm.
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