تحلیل و میرا نمودن نوسانات ناشی از مد SSR در مزارع بادی دارای DFIG با کنترل ولتاژ استاتور در شرایط حفظ MPPT

نوع مقاله : علمی-پژوهشی

نویسندگان

دانشکده مهندسی برق - دانشگاه تربیت دبیر شهید رجایی

چکیده

پدیده تشدید زیر سنکرون (SSR) حالتی است که نیروگاه بادی در یک یا چند فرکانس زیر سنکرون با شبکه الکتریکی انرژی مبادله می‌کند. در صورت عدم جلوگیری، این پدیده موجب خساراتی به سیستم می‌شود. پدیده SSR ناشی از دو اثر مولد القایی و اثر تداخل پیچشی است.  SSRدر مزارع بادی با DFIG به دلیل اثر مولد القایی روی می‌دهد. در این تحقیق با کنترل ولتاژ استاتور، به تضعیف و یا پیشگیری از SSR با در نظر گرفتن حفظ شرایط MPPT پرداخته‌شده است. به‌طوری‌که با کنترل مستقیم ولتاژ استاتور، به‌صورت غیرمستقیم جریان خط سیستم کنترل‌شده و از اثر مولد القایی جلوگیری به‌عمل‌آمده است. برای این منظور از یک کنترلر اضافی به نام کنترلر میرا کننده SSR استفاده‌شده است. این کنترلر به مبدل GSC ژنراتور دو سو تغذیه اعمال‌شده است. به دلیل این‌که SSR به‌سرعت و فرکانس روتور ژنراتور وابسته است، سرعت روتور به‌عنوان سیگنال ورودی به این کنترلر انتخاب گردیده است. به‌منظور شبیه‌سازی، نرم‌افزار MATLAB/SIMULINK به کار گرفته‌شده و برای تصدیق روش، مزرعه بادی با DFIG در نظر گرفته‌شده است که با خط انتقال جبران‌شده سری خازنی به شین بی‌نهایت متصل است.

کلیدواژه‌ها

عنوان مقاله [English]

Analysis and Damp of Oscillations Caused by SSR Mode in DFIG Based Wind Farm by Controlling of Stator Voltage in Conditions of Maintaining MPPT

نویسندگان [English]

  • A. A. Motiebirjandi
  • D. Fateh
Faculty of Electrical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran
چکیده [English]

The subsynchronous resonance (SSR) phenomenon is a condition that the wind farm exchanges energy with the electrical network at one or more of the subsynchronous frequencies. If it is not prevented, this phenomenon causes damages to the system. The SSR phenomenon occurs in two following conditions: Induction generator effect and Torsional interaction effect. The SSR occurs in the DFIG based wind farms due to the induction generator effect. In this research, by controlling the stator voltage, the SSR is mitigated or prevented with considering the maintenance of MPPT condition. So that, with direct control of the stator voltage, line current of the system is controlled indirectly and prevented from the induction generator effect. For this purpose, an additional controller called SSR damping controller is used. This controller is applied to GSC converter of the DFIG. Because the SSR depends on the speed and frequency of the generator rotor, the rotor speed is selected as the input signal of this controller.  In order to simulate, the MATLAB/SIMULINK software has been used. To verify the proposed method, a DFIG based wind farm connected to an infinite bus by a series capacitor compensated transmission line, is considered.

کلیدواژه‌ها [English]

  • SSR
  • DFIG
  • SSR damping controller
  • induction generator effect
  • voltage control

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