IJE TRANSACTIONS A: Basics Vol. 32, No. 4 (April 2019) 536-547    Article in Press

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A. R. Solat, A. M. Ranjbar and B. Mozafari
( Received: December 31, 2018 – Accepted: March 07, 2019 )

Abstract    Doubly-fed induction generator (DFIG) based wind turbines with traditional maximum power point tracking (MPPT) control provide no inertia response under system frequency events. Recently, the DFIG wind turbines have been equipped with virtual inertia controller (VIC) for supporting power system frequency stability. However, the conventional VICs with fixed gain have negative effects on inter-area oscillations of regional networks. To cope with this drawback, this paper proposes a novel adaptive VIC to improve both the inter-area oscillations and frequency stability. In the proposed scheme, the gain of VIC is dynamically adjusted using fuzzy logic. The effectiveness and control performance of the adaptive fuzzy VIC is evaluated under different frequency events such as loss of generation, short circuit disturbance with load shedding. The simulation studies are performed on a generic two-area network integrated with a DFIG wind farm and the comparative results are presented between three cases: DFIG without VIC, DFIG with fixed gain VIC, and DFIG with adaptive fuzzy VIC. All the results confirm the proposed fuzzy VIC can improve both the inter-area oscillations and frequency stability.


Keywords    Doubley Fed Induction Generator Wind Turbine; Virtual Inertia Control; Frequency Stability; Inter-area Oscillation; Fuzzy Logic



توربين¬های بادی مبتنی بر DFIG با کنترل سنتی MPPT نمی توانند پاسخ اينرسيايی موثری به اختلالات فرکانسی شبکه داشته باشند. اخيراً با افزايش ظرفيت توليدات بادی، استراتژی کنترل اينرسی مصنوعی DFIG به منظور پشتيبانی از پايداری فرکانسی شبکه متصل شده، پيشنهاد شده است. با اين حال، در اين مقاله نشان داده می¬شود که کنترل اينرسی مصنوعی متداول با بهره ثابت، اثرات منفی بر ميرايی نوسانات بين ناحيه ای در شبکه¬های قدرت چند ناحيه ای دارد. براي مقابله با اين مشکل، در اين مقاله، يک کنترل¬کننده اينرسی مصنوعي تطبيقی مدرن به منظور کنترل هماهنگ پاسخ اينرسی DFIG و ميرايی نوسانات بين ناحيه ای شبکه قدرت پيشنهاد می-شود. در طرح پيشنهادی، بهره VIC ثابت نيست بلکه با استفاده از منطق فازی و به طور تطبيقی با توجه به نوسانات بين ناحيه¬ای شبکه تنظيم می-شود. عملکرد و کارايي کنترل کننده اينرسی مصنوعی فازی پيشنهادی در شرايط اختلالات فرکانسی مختلف نظير فقدان ناگهانی توليد، خطای اتصال کوتاه و قطع بار، ارزيابی می شود. همچنين مطالعات شبيه سازی روی يک سيستم قدرت دو ناحيه ای استاندارد که يک مزرعه بادی به آن متصل شده است انجام می¬شود و نتايج به صورت مقايسه¬ای برای سه مورد ارايه می¬شوند: 1) DFIG بدون کنترل اينرسی مصنوعی، 2) DFIG با کنترل اينرسی مصنوعی با بهره ثابت، 3) DFIG با کنترل اينرسی مصنوعی تطبيقی فازی. تمام نتايج بدست آمده تأييد می¬کنند که کنترل کننده اينرسی مصنوعی پيشنهادی، علاوه بر بهبود پايداری فرکانسی سيستم قدرت به طور همزمان ميرايی نوسانات بين ناحيه ای را نيز افزايش می¬دهد.


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