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GÜÇ KATSAYISI DÜZELTİM DEVRELERİNDE ORTALAMA AKIM KONTROL TEKNİĞİ VE SAYISAL SİNYAL İŞLEMCİSİ KULLANARAK YENİ BİR YÖNTEMİN UYGULANMASI

A NOVEL METHOD IN POWER FACTOR CORRECTION CIRCUITS USING AVERAGE CURRENT CONTROL TECHNIQUE AND DIGITAL SIGNAL PROCESSOR

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2011

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
In this study, a new improved control technique is developed to eliminate the input current harmonics in the Bridgeless Power Factor Correction (PFC) circuit. According to this approach, input voltage is not directly used as the reference like conventional methods. This is due the fact that the input ac mains voltage is not always a sinusoidal wave. In this method, a sampling circuit is designed according to positive and negative half cycle of input voltage. Thus, a reference signal is generated in the same phase and frequency of the input ac mains voltage. The desired power factor correction is achieved using the reference sine wave. In this manner, the injection of the input current harmonics as the result of the distorted input voltage to the ac mains is prevented. Sinusoidal PWM signals are generated by the control unit based on the measured sampling data. The system is operated and controlled by applying these signals to the gates of the switches. The system satisfies the conditions of IEC 61000-3-2 current harmonics standards successfully. The design, control and switching techniques of the circuit have been carried out using Simulink blocks in MATLAB/Simulink program. The proposed method and the theoretical analysis are verified by the results of experiments carried out in the laboratory.
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Abstract (Original Language): 
Bu çalışmada, giriş akım harmoniklerini yok etmek amacıyla köprüsüz güç katsayısı düzeltim devresine yeni bir kontrol tekniği yaklaşımı geliştirilmiştir. Bu yaklaşıma göre klasik yöntemlerde olduğu gibi giriş gerilimi doğrudan referans olarak kullanılmamaktadır. Bunun nedeni ise şebeke geriliminin her zaman sinüs dalgalı bir sinyal olmamasıdır. Bu yöntemde, şebeke geriliminin pozitif ve negatif durumlarına göre örnekleme devresi oluşturulmuştur. Böylece şebeke ile aynı faz ve frekansta sinüs dalga üretilerek referans giriş gerilimi elde edilmiş olunmaktadır. Sinüs referans gerilimi ile istenilen güç katsayısı düzeltimi gerçekleştirilmektedir. Böylece bozuk şebeke geriliminin etkisiyle meydana gelen akım harmoniklerinin sisteme yansıması önlenmektedir. Alınan örnekleme sinyalleri denetim biriminden geçirilerek sinüzoidal PWM sinyali üretilmektedir. Bu sinyaller devrede bulunan anahtarların geçitlerine iletilerek sistemin denetimi ve çalışması sağlanmaktadır. Sistem, IEC 61000-3-2 akım harmonikleri standart koşullarını başarıyla sağlamaktadır. Tasarımı, denetimi ve anahtarlama teknikleri MATLAB/Simulink ortamında Simulink blokları kullanılarak yapılmıştır. Önerilen teknik ve teorik çalışmaları laboratuar çalışmalarından elde edilen sonuçlar ile desteklenmektedir.
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Güç Katsayı Düzeltim Devrelerinde Ortalama Akım Kontrol Tekniği ve Sayısal Sinyal ... A. Karaaslan ve İ. İskender
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