مدلسازی و تخمین تلفات کرونا در خطوط انتقال HVDC دوقطبی

تبریزیان, محمد; مرصعی, نغمه; انصاریان, مقداد

مدلسازی و تخمین تلفات کرونا در خطوط انتقال HVDC دوقطبی

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشگاه آزاد اسلامی واحد یادگار امام(ره) شهرریدانشکده مهندسی برقگروه برق-قدرت

² دانشگاه آزاد اسلامی-واحد یادگار امام(ره) شهرری

³ دانشگاه آزاد اسلامی واحد یادگار امام خمینی(ره) شهرری

چکیده

تلفات کرونا یکی از مسائل اصلی در طراحی خطوط انتقال HVDC می باشد. تحقیقات بسیار زیادی در زمینه محاسبات تلفات کرونا در خطوط انتقال DC درولتاژهای مختلف خط صورت پذیرفته است. در خطوط انتقال دو قطبی (Bipolar)HVDC ، یون های مثبت، منفی و ذرات ناشی از ترکیب یون ها بایکدیگر تحت تاثیر کرونا تولید می گردند. با توجه به حضور ذرات مختلف در کرونا ، پیچیدگی محاسبات نسبت به میدان های تک قطبی بیشتر خواهد بود. در این مقاله روابط دو قطبی حاکم بر میدان حل شده و پس از محاسبه چگالی جریان بارهای مثبت و منفی ، تلفات کرونا محاسبه می گردد. در محاسبات مربوط به چگالی جریان به منظور ساده سازی، فرض بر این خواهد بود که تمامی محدوده دارای بارهای مثبت و منفی بوده و ضخامت محیط شبیه سازی شده در اطراف کابل ها، محدود باشد و پتانسیل زمین به عنوان مرجع برابر با صفر در نظر گرفته خواهد شد. روش های عددی مختلفی برای محاسبه میدان الکتریکی وجود دارند. این روش های عددی قادر هستند مسایلی را که در آنها حل تحلیلی بسیار مشکل یا غیر ممکن است را حل نمایند. روش های عددی پرکاربرد شامل روش های تفاضل محدود، المان محدود، المان مرزی، شبیه سازی بار و مونت کارلو می باشند. در این مقاله از روش المان محدود در محاسبه میدان کرونا در خطوط انتقال دو قطبی HVDC استفاده خواهد شد هم چنین در توپولوژی به کار رفته از روش شبیه سازی بار نیز استفاده خواهد شد.

کلیدواژه‌ها

20.1001.1.26455153.1395.4.4.5.

عنوان مقاله [English]

Modeling and Estimation of Corona Losses in Bipolar HVDC Transmission Line Using Finite Element Methods(FEM)

چکیده [English]

Corona losses are one of the main issues in the design of HVDC transmission lines. A lot of research has been done in the calculation of corona losses in DC transmission lines in various line voltages. In bipolar transmission lines, positive ions, negative ions and ion-ion particles are produced under the influence of corona. Due to the presence of various particles in the corona, the complexity of the calculations will be higher than unipolar fields. In this article, the bipolar relations governing the field are solved and after calculating the positive and negative load flow density, corona losses are calculated.
In this paper, finite element methods (FEM) have been used to calculate corona losses in a DC high voltage transmission line. Simulations of the FEM method have been performed by ANSYS software. Given that the algorithm provides a lot of calculations in the analysis of the results of simulations and reloading the results in the simulation, then the MATLAB software has been used to analyze the ANSYS outputs. The results obtained in this paper include distribution of electric field strength vectors, electrical flux density, potential and also free loads within the corona range. In addition to the above, corona flow and casualties are the final results of the calculations made in this article.

کلیدواژه‌ها [English]

Bipolar Transmission Lines
Corona Losses
Finite Element Method
HVDC

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