یک روش جدید برمبنای تبدیل S هایپربولیک اصلاح‌شده برای تمایز خطای داخلی از دیگر شرایط غیرعادی در ترانسفورماتور قدرت

نوع مقاله : علمی-پژوهشی

نویسندگان

دانشکده مهندسی - دانشگاه شهید چمران

چکیده

در این مقاله، یک روش جدید برای تمایز خطای داخلی از دیگر شرایط غیرعادی درترانسفورماتورهای قدرت ارائه شده­است. از­آن­جایی­که سیگنال­های جریان دیفرانسیل ناایستا هستند، یک ابزار قدرتمند هم­چون تبدیل S برای تحلیل زمان- فرکانس آن­ها مورد­نیاز است. در ابتدا شبیه­سازی­های مختلفی برای حالت­های خطای داخلی، جریان هجومی، خطای خارجی، اضافه تحریک و فوق اشباع برای شرایط کاری مختلف ترانسفورماتور با در­نظر­گرفتن عوامل مؤثر بر آن با استفاده از نرم افزار PSCAD/EMTDC انجام می­گیرد. پس از آن سیگنال­های جریان دیفرانسیل بدست­آمده، توسط تبدیل S هایپربولیک اصلاح­شده آنالیز می­شوند. از ماتریس تبدیل S هاریپربولیک اصلاح­شده، ویژگی­های مهم استخراج می­شوند و براساس آن­ها شرایط مختلف تشخیص و کلاس­بندی می­گردند. "این ویژگی­ها شامل: انرژی سطح اول کانتور، شاخص واریانس، انحراف معیار فاز مولفه اصلی و هارمونیک دوم و سه معیار ویژه است." فرایند اجرای تبدیلS هاریپربولیک اصلاح­شده و پیاده­سازی الگوریتم پیشنهادی در نرم افزار MATLAB انجام خواهدشد. در این مقاله همه حالت­های گذرای ممکن و اثر اشباع ترانسفورماتورهای جریان در نظر گرفته می­شوند. در­نهایت صحت و دقت روش پیشنهادی با روش­های مختلف در شرایط با نویز و بدون نویز مقایسه می­شوند. نتایج بدست­آمده عملکرد خوب روش پیشنهادی را نشان می­دهد.

کلیدواژه‌ها

عنوان مقاله [English]

A New Modified Hyperbolic S Transform-Based Method for Discrimination of Internal Fault from Other Abnormal Conditions in Power Transformer

نویسندگان [English]

  • A. Behvandi
  • S. Gh. Seifossadat
  • A. Saffarian
Faculty Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده [English]

 In this paper, a new method is presented for discrimination of internal fault other abnormal conditions in power transformers. Since the differential current signals are non-stationary, a powerful tool such as S transform is needed for time- frequency analysis of them. First, by considering the effective factors, different simulations for internal fault, inrush current, external fault, over-excitation and ultrasaturation conditions are performed via PSCAD/EMTDC software in different operating conditions of transformer.Then, the obtained differential current signals are analyzed by modified hyperbolic S transform. Important characteristics are extracted from modified hyperbolic S transform and according to them, different conditions are distinguished and classified. These features include: energy contour of first level, variance index, standard deviation of the fundamental frequency and second harmonic component and three special criteria. The process of modified hyperbolic S transform and performing the proposed algorithm are performed in MATLAB software. In this paper, all of possible transient conditions and effects of the saturation of current transformers are considered. Finally, the accuracy and precision of the proposed method are compared with different methods in conditions with noise and without noise. The results show good performance of the proposed method.

کلیدواژه‌ها [English]

  • Differential protection
  • modified hyperbolic stockwell transform
  • internal fault
  • ultrasaturation
  • over-excitation

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