بهبود رفتار گذرای توربین‏های بادی مبتنی بر DFIG با به کارگیری استراتژی کنترلی با میرایی فعال

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد- اداره آموزش و پرورش شهرستان مبارکه، مبارکه، اصفهان

2 استادیار – دانشکده مهندسی برق، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف‌آباد، اصفهان، ایران

چکیده

در این پژوهش ابتدا درباره مشخصات دینامیکی توربین بادی مجهز به ژنراتور القایی دو‏ سو تغذیه بحث می‏شود. DFIG نسبت به کمبود ولتاژ پایانه ژنراتور بسیار حساس است. زیرا افت ولتاژ عمیق باعث القای ولتاژ‏های ضد محرکه‏ی بزرگ در روتور می‏شود که این امر منجر به عبور جریان گذرای شدید از روتور و افزایش ولتاژ لینک DC در مبدل قدرت و در نتیجه آسیب دیدن مبدل الکترونیک قدرت می‏گردد. ولتاژهای نیروی ضد محرکه‏ی القایی (BACK EMF) در DFIG اثرهای دینامیکی استاتور را روی جریان‏های دینامیکی روتور منعکس می‏کند و نقش مهمی روی جریان هجومی روتور در ضمن کمبود ولتاژ ژنراتور دارد. جبران‏سازی ‏این ولتاژها می‏تواند قابلیت اتصال به شبکه ژنراتور را بهبود دهد و جریان‏های گذرای روتور را محدود کند. طرح کنترل خطی به طور مناسب تحت کمبود ولتاژهای بزرگ نمی‏تواند کار کند، در این مورد از کنترل‏کننده با میرایی فعال جهت بهبود حالت گذرا و پایداری استفاده می‏شود. دیدگاه پیشنهاد شده حالت‏های دینامیکی داخلی را از طریق کنترل ولتاژ روتور پایدار می‏کند و رفتار دینامیکی DFIG را بعد از برطرف شدن خطا بهبود می‏بخشد.نتایج حاصل از مطالعات نظری توسط شبیه‏سازی حوزه زمان کاهش پیک و نوسانات پاسخ گذرای توربین بادی مبتنی بر DFIG را نشان می‌دهند

کلیدواژه‌ها


عنوان مقاله [English]

Transient Performance Improvement of Wind Turbines with Doubly Fed Induction Generators Using Active Damping Control Strategy

نویسندگان [English]

  • Saeed Soleymani 1
  • Bahador Fani 2
  • Mohammad Reza Yousefi 2
1 MSc - Department of Mobarakeh City Education, Mobarakeh, Isfahan, Iran
2 Assistant Professor - Department of Electrical Enginnering, Islamic Azad University, Najafabad Branch, Najafabad, Isfahan, Iran
چکیده [English]

This paper Analytically investigates the effects of system and controller parameters and operating conditions on the dynamic and transient behavior of wind turbines (WTs) with doubly-fed induction generators (DFIGs) under voltage dips and wind speed fluctuations. Also, it deals with the design considerations regarding rotor and speed controllers. The poorly damped electrical and mechanical modes of the system are identified, and the effects of system parameters, and speed/rotor controllers on these modes are investigated by modal and sensitivity analyses. The results of theoretical studies are verified by time domain simulations. It is found that the dynamic behavior of the DFIG-based WT under voltage dips is strongly affected by the stator dynamics. Further, it is shown that the closed loop bandwidth of the rotor current control, rotor current damping, DFIG power factor and the rotor back-emf voltages have high impact on the stator modes and consequently on the DFIG dynamic behavior. Moreover, it is shown that the dynamic behavior of DFIG-based WT under wind speed fluctuation is significantly dependent on the bandwidth and damping of speed control loop.

کلیدواژه‌ها [English]

  • Doubly fed induction generator
  • active damping
  • transient performance. Ride-through capability
  • Bandwdith
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