Direct Field-Oriented Control of an Induction Motor Using Fuzzy Logic Speed Controller

Öz

This paper presents a direct field-oriented control (DFOC) scheme for a squirrel-cage induction motor in which the outer speed control loop is implemented using a Mamdani-type fuzzy logic controller with a full 49-rule base. The proposed approach aims to enhance dynamic performance and robustness of induction motor drives operating under nonlinear characteristics, parameter variations, and rapid load or speed changes. In the adopted rotor-flux-oriented DFOC architecture, the fuzzy speed controller utilizes the speed error and its derivative as input variables and directly generates the reference value of the torque-producing stator current component in the synchronous reference frame. Seven linguistic terms are employed for each input and output variable, resulting in a finely shaped nonlinear control surface capable of providing aggressive control action during large transients and smooth regulation near steady-state conditions. The complete drive system is modeled and implemented in MATLAB Simulink, including the inverter, induction motor, and control system. Simulation results demonstrate fast and well-damped speed responses for step changes in reference speed, reliable four-quadrant operation, limited overshoot, and steady-state speed error maintained below approximately 1%. The results confirm that the proposed 49-rule fuzzy logic speed controller offers an effective and practical solution for high-performance DFOC induction motor drives, achieving a favorable trade-off between control accuracy, dynamic response, and controller complexity.

Anahtar Kelimeler

• Induction motor
• direct field-oriented control
• fuzzy logic control
• speed control
• electric drive systems.

Bulanık Mantık Hız Denetleyicisi Kullanılarak Asenkron Motorun Doğrudan Alan Yönelimli Kontrolü

Öz

Bu makale, dış hız kontrol döngüsünde 49 kural tabanlı Mamdani tipi bulanık mantık denetleyicisi kullanılan bir sincap kafesli indüksiyon motoru için doğrudan alan yönelimli kontrol (DFOC) şemasını sunmaktadır. Önerilen yaklaşım, doğrusal olmayan davranışlar, parametre değişimleri ve ani yük veya hız değişimleri altında çalışan indüksiyon motor sürücülerinin dinamik performansını ve sağlamlığını iyileştirmeyi hedeflemektedir.Benimsenen rotor akısı yönelimli DFOC mimarisinde, bulanık hız denetleyicisi giriş olarak hız hatası ve hız hatasının türevini kullanmakta ve senkron referans çerçevesinde tork üreten stator akım bileşeninin referans değerini doğrudan üretmektedir. Her bir giriş ve çıkış değişkeni için yedi dilsel terimin kullanılması, büyük geçişler sırasında agresif kontrol etkisi sağlarken, kararlı durum koşullarına yakın bölgelerde daha düzgün ve hassas bir regülasyon sunan iyi şekillendirilmiş doğrusal olmayan bir kontrol yüzeyi elde edilmesine olanak tanımaktadır. İnverter, indüksiyon motoru ve kontrol sistemi dâhil olmak üzere tüm sürücü yapısı MATLAB/Simulink ortamında modellenmiş ve uygulanmıştır. Simülasyon sonuçları, referans hızındaki kademeli değişimler için hızlı ve iyi sönümlenmiş hız tepkileri, güvenilir dört kadranlı çalışma, sınırlı aşırı salınım ve yaklaşık %1’in altında tutulan kararlı durum hız hatası elde edildiğini göstermektedir. Elde edilen bulgular, önerilen 49 kurallı bulanık mantık hız denetleyicisinin, kontrol doğruluğu, dinamik yanıt ve denetleyici karmaşıklığı arasında etkili bir denge sağlayarak yüksek performanslı DFOC tabanlı indüksiyon motor sürücüleri için uygulanabilir ve pratik bir çözüm sunduğunu doğrulamaktadır.

Anahtar Kelimeler

• İndüksiyon motoru
• doğrudan alan yönlendirmeli kontrol
• bulanık mantık kontrolü
• hız kontrolü
• elektrikli tahrik sistemleri.

Kaynakça

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