شبیه‌سازی کوره قوس AC فرکانس پایین به روش اجزای محدود و استخراج مشخصه‌های فیزیکی قوس جهت بررسی پایداری قوس الکتریکی با رفتار دینامیکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی مالک اشتر

2 دانشگاه صنعتی مالک اشتر، مجتمع دانشگاهی برق و کامپیوتر

چکیده

کوره‌های قوس الکتریکی از بزرگ‌ترین بارهای متمرکز، غیرخطی و با رفتار آشوبناک در شبکه‌های توزیع قدرت می‌باشند. مدل‌سازی و شبیه‌سازی مغناطیسی این بارها کمترین خطا را نسبت به ماهیت و رفتار فیزیکی قوس الکتریکی داشته و در دقت مطالعات، نقش بسزایی دارد. در این مقاله شبیه‌سازی کوره قوس الکتریکی AC فرکانس پایین، به روش اجزای محدود و با کمک نرم‌افزار قدرتمند COMSOL Multiphysics، انجام می‌گیرد. روش اجزای محدود جهت تحلیل‌های مغناطیسی، حرارتی و دینامیکی روش مرسومی بوده و توانمندی خود را در حوزه‌های فیزیکی مختلف به اثبات رسانیده است. در شبیه‌سازی به روش اجزای محدود، مدار الکتریکی مورد استفاده، ابعاد الکترود، شرایط دمایی اولیه و منبع تغذیه ورودی کوره نیز در نظر گرفته می‌شوند. با استفاده از حل هم‌زمان معادلات فیزیکی مختلف در نرم‌افزار COMSOL Multiphysics و بهره‌گیری از روابط و اصول مگنتوهیدرودینامیک، قانون آمپر، قانون اهم و معادلات ماکسول مدل قوس الکتریکی و نحوه ایجاد پلاسما مطالعه می‌شوند. سپس با استخراج نتایج و مقایسه با روابط و مطالعات پیشین، پایداری قوس مورد ارزیابی قرار می‌گیرد. پایداری قوس سبب کاهش هارمونیک‌های تولیدی و فلیکر ولتاژ تحمیلی به شبکه شده و نیاز به ادوات جبران‌ساز را کاهش می‌دهد.

کلیدواژه‌ها


عنوان مقاله [English]

Finite Element-based Simulation of low-frequency AC Arc Furnace and Extraction of Arc Physical characteristics to investigate the stability of electric arcs with dynamic behavior

نویسندگان [English]

  • mostafa golrokh joubeni 1
  • Arash Dehestani Kolagar 2
  • Mohammad Reza Alizadeh Pahlavani 2
1 malek ashtar university of technology
2 Faculty of Electrical & Computer Engineering, Malek Ashtar University of Technology, Iran
چکیده [English]

Electric arc furnaces are the largest concentrated, nonlinear and chaotic loads in power distribution networks. Magnetic modeling and simulation of such loads have the least error with respect to the physical nature of the arc and play a significant role in the accuracy of the studies. In this paper, the electromagnetic simulation of a low-frequency AC arc furnace is performed based on finite element method, utilizing the powerful COMSOL Multiphysics software. The finite element method for magnetic, thermal and dynamic analysis is a commonly used method and its capability in various physical fields has been repeatedly proven. In this finite element simulation, the corresponding electrical circuit, the electrode physical dimensions, the initial thermal condition and the furnace power supply system are also considered. By simultaneous solving of different physical equations in COMSOL Multiphysics software and applying the magnetohydrodynamic principles, Ampere's law, Ohm's law, and Maxwell’s equations, the arc model and plasma generation are investigated. Then, by extracting the results and comparing them with previous studies, the stability of the arc is evaluated. A stable arc decreases the harmonic components and also diminishes the voltage flicker severity imposed on the grid and thus, reduces the need for compensator equipment.

کلیدواژه‌ها [English]

  • Electric Arc furnace
  • Plasma
  • Arc stability
  • Thermal Plasma
  • High Current Arc
  • Dynamic Arc
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