کنترل مد لغزشی مرتبه کسری تطبیقی برای ژنراتور مغناطیس دائم سنکرون همراه با رویتگر اغتشاش

نوع مقاله : علمی-پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی برق، دانشگاه صنعتی همدان، همدان، ایران

2 دانشیار، گروه مهندسی برق، دانشگاه صنعتی همدان، همدان، ایران

چکیده

در این مقاله، یک روش کنترل مد لغزشی مرتبه کسری تطبیقی جدید برای ردگیری نقطه حداکثر توان ژنراتور مغناطیس دائم سنکرون (PMSG) طراحی شده است. هدف از کنترل، ردیابی سرعت روتور بهینه به منظور استخراج بیشینه توان از سیستم توربین بادی در حضور اغتشاش و نامعینی پارامتری است. ابتدا یک سطح لغزش مرتبه کسری جدید تعریف می­شود. از آنجایی که در کنترل کننده مدلغزشی برای تضمین پایداری سیستم حلقه بسته، دانستن کران بالای نامعینی­ها و اغتشاشات لازم است، و از طرفی محاسبه آن برای مسائل کاربردی از جمله توربین بادی مشکل بوده و با خطا همراه است. لذا در ادامه پارامترهای سیگنال کنترل، توسط قوانین تطبیقی پیشنهادی، بصورت برخط تخمین زده می­شوند تا ضمن افزایش سرعت همگرایی متغیرهای حالت به مقدار مرجع و کاهش پدیده چترینگ، قوام سیستم را در برابر اغتشاش خارجی و نامعینی پارامتری افزایش دهند. از سویی دیگر با توجه به ناشناخته بودن دینامیک اغتشاش، یک رویتگر اغتشاش جهت تخمین اغتشاش خارجی و نامعینی پارامتری طراحی شده است. سپس، اثبات پایداری سیستم حلقه بسته کلی همراه با رویتگر اغتشاش با استفاده از تئوری لیاپانوف انجام شده است. در آخر، نتایج شبیه‌سازی با در نظر گرفتن دو سناریو متفاوت؛ اولی با تغییرات باد پله همراه با اغتشاش خارجی و دومی به ازای تغییرات سرعت باد سینوسی در حضور نامعینی پارامتری بدست آمده‌اند. نتایج شبیه‌سازی با روش متداول مد لغزشی مرتبه صحیح مقایسه شده و خروجی‌ها نشان‌دهنده عملکرد موثر کنترل‌کننده پیشنهادی در ردیابی مسیر مرجع، افزیش قوام آن در برابر نامعینی و اغتشاش و کاهش پدیده چترینگ است.

کلیدواژه‌ها

عنوان مقاله [English]

Adaptive Fractional Order Sliding Mode Control for PMSG with Disturbance Observer

نویسندگان [English]

  • A. M. Aghazamani 1
  • H. Delavari 2
1 Electrical Engineering Department, Hamedan University of Technology, Hamedan, Iran.
2 Electrical Engineering Department, Hamedan University of Technology, Hamedan, Iran.
چکیده [English]

In this paper, a new adaptive fractional-order sliding mode controller is designed for a Permanent Magnet Synchronous Generator (PMSG) to track the maximum power point. The controller objective is to track the desired generator speed to extract the maximum power from the wind turbine system in the presence of parametric uncertainty and external disturbances. First, a new fractional order sliding surface is defined. To ensure the stability of the closed-loop system in the sliding model controller it is required to know the upper bounds of uncertainties and disturbances, where it is difficult to calculate these bounds for practical applications such as wind turbines. Therefore, the control signal parameters are estimated online by the proposed adaptive laws, in order to increase the convergence rate of the state variables to the reference value and reduce the chatting phenomenon, also to increase the system robustness against external disturbances and parametric uncertanity. On the other hand, due to the unknown disturbance dynamics, a disturbance observer is designed to estimate external disturbances and parametric uncertainty. Then, the stability of the general closed-loop system together with the disturbance observer is performed using Lyapunov's theory. Finally, the simulation results considering two different scenarios; first for step wind changes with external disturbance, second for changes in sine wind speed with parametric uncertainty. The results are compared with conventional sliding mode controller and results show the effective performance of the proposed controller in tracking the reference value, increasing its robustness against uncertainty and disturbance and reducing the chatting phenomenon.

کلیدواژه‌ها [English]

  • Wind turbine
  • permanent magnet synchronous generator (PMSG)
  • sliding mode control
  • fractional calculus
  • adaptation laws
  • disturbance observer
  • parametric uncertainties

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