کنترل برداری بدون‌سنسور DFIG با رویتگر MRAS بر اساس جریان روتور در شرایط افت ولتاژ نامتعادل شبکه
محورهای موضوعی : مهندسی برق و کامپیوترعبدالمجید حسنی 1 * , رضا کیانی‌نژاد 2
1 - دانشگاه شهید چمران اهواز
2 - دانشگاه شهید چمران اهواز
کلید واژه: کنترل برداری بدون سنسور توان اکتیو و راکتیو DFIG RCMO,
چکیده مقاله :
در اين مقاله يك كنترل‌کننده بدون سنسور برای ژنراتور القایی از دو سو تغذیه DFIG در شرايط نامتعادلي ولتاژ شبكه طراحی شده و به جای اندازه‌گیری سرعت و زاویه روتور از تخمین آنها با RCMO استفاده شده است. ولتاژ نامتعادل شبکه، باعث ایجاد مؤلفه منفی ولتاژ و جریان DFIG می‌شود. توالی‌های مثبت و منفی مدل DFIG در چارچوب مرجع سنکرون در نظر گرفته شده‌اند. تغيير در توان مرجع اکتیو و راکتیو DFIG، یعنی P و Q با وجود مؤلفه منفي ولتاژ و جريان تعريف شده و دنباله‌روی توان تولیدی از مرجع تحقیق‌شده است. در این مقاله هدف سیستم كنترلی، حذف نوسان‌های جريان روتور می‌باشد و بدین منظور دو كنترل‌کننده در چارچوب مرجع استاتور dq برای هر یک از مؤلفه‌های مثبت و منفی در نظر گرفته شده كه بتواند كنترل دقيق و صحيحي بر روي مؤلفه‌هاي جريان روتور (مؤلفه مثبت و منفي) ايجاد كند. برای ارزیابی الگوریتم پیشنهادی، شبيه‌سازي بر روي يك سيستم DFIG ، MW 2 در محیط نرم‌افزار MATLAB/Simulink انجام شده است. نتایج به دست آمده از شبیه‌سازی نشان مي‌دهد الگوریتم کنترل برداری بدون سنسور پیشنهادی با وجود نامتعادلی ولتاژ شبکه، به خوبی سرعت و موقعیت روتور را تخمین زده و به علاوه همچون کنترل با سنسور، توان‌های مورد نیاز شبکه را نیز تأمین می‌کند.
This paper proposes a new application of sensorless control method for doubly fed induction generator (DFIG) using rotor-current-based MRAS observer (RCMO) under grid voltage dip. MRAS means model reference adaptive system. In this paper the method of control of DFIG is vector control VC (or field oriented control FOC). The position and speed of rotor are estimated by RCMO instead of measuring. DFIG is connected to a grid with a balanced voltage dip on PCC and is tested by large variation in rotor speed. Simulation results using MATLAB/Simulink are presented for a 2-MW DFIG. The simulation results show the decoupled control of active and reactive power of DFIG in three conditions: a) normal voltage of grid b) grid voltage dip c) huge variation at wind speed. The results show that the estimated speed of rotor and power produced in DFIG carefully follows the references. The conclusion of simulation results is that for decoupled control of active and reactive power of DFIG, application of RCMO method is favorable and acceptable under balanced voltage dips and variable speed wind as well as conventional VC.
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