Tek Fazlı Köprüsüz Düşürücü GFD Konvertörleri için PQ Tabanlı Yeni Bir Denetleyici

Doğrusal olmayan yükler enerji sistemlerine bağlandıklarında şebekenin güç kalitesini bozmaktadırlar. Bu yüzdenenerji sistemlerinde güç faktörünün (GF) yanı sıra toplam harmonik bozulmasınında (THB) iyileştirilmesigerekmektedir. Bu çalışmada enerji sistemlerinde GF'nin yanı sıra THB'ninde geliştirilmesinde kullanılan tek fazköprüsüz düşürücü güç faktörü düzeltme (DGFD) konvertörlerinin kontrolü için PQ güç teorisine dayalı yeni birdenetleyici önerilmektedir. Köprüsüz DGFD konvertörlerde, girişte bulunan köprü doğrultucu karmaşıklığıazaltmak ve genel verimliliği artırmak için ortadan kaldırılmaktadır. Önerilen PQ tabanlı denetleyicide referansakım sinyali anlık aktif ve reaktif güçler kullanılarak elde edilmektedir. Elde edilen referans akım sinyali PWManahtarlama sinyallerini üretmek için akım kontrol döngüsünde kullanılmaktadır. Önerilen denetleyicininperformansı 100W’lık DGFD konvertör için PSIM programı kullanılarak doğrulanmıştır. Önerilen denetleyici tekfazlı sistemlerde GF'nin yanı sıra THB'nin geliştirilmesi açısından geçici ve kararlı durum performansına göreoldukça başarılı bulunmuştur.

A New Controller based on PQ for Single Phase Bridgeless Buck PFC Converters

When nonlinear loads are connected to energy systems, they decrease the power quality of the grid. Therefore, there is a need to improve the total harmonic distortion (THD) as well as the power factor (PF). In this study, a new controller based on PQ power theory is presented for single-phase bridgeless buck power factor correction (DPFC) converters to improve the THD as well as the PF of the energy systems. In bridgeless BPFC converters, the input bridge rectifier is removed to reduce complexity and increase overall efficiency. In the proposed PQ based controller, the reference current signal is obtained by using the active and reactive powers. The reference current signal is used in the current control loop to generate PWM switching signals. The performance of the proposed controller is verified using the PSIM circuit simulation for a 100W BPFC converter. The proposed controller is found to be quite successful in terms of the improvement of THD and PF in single phase systems according to the transient and steady state performance.

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