A NEW HIGH-GAIN NONISOLATED DC-DC STEP-UP CONVERTER FOR PHOTOVOLTAIC SYSTEMS

Abstract

In this study, a novel hybrid non-isolated DC-DC boost converter based on switched capacitor and active switched inductor structures is proposed for photovoltaic applications. An original circuit topology has been introduced by utilizing an auxiliary capacitor in the designed converter. The proposed converter provides a high voltage gain between the input and output voltages. Moreover, the voltage stress on the MOSFETs is significantly reduced. In addition, thanks to the use of the capacitor in the proposed circuit, voltage fluctuations across both the switching elements (diodes and MOSFETs) and the output voltage are considerably mitigated. Furthermore, the proposed circuit ensures continuous input current, contributing to improved performance. In this paper, all analyses related to the proposed circuit have been carried out, and all design calculations have been explained in detail. The performance and validity of the proposed converter have been verified through the results of the study.

Keywords

• Switched Capacitor
• Active Switched-Inductor
• Photovoltaic Systems Non-Isolated DC-DC Boost Converter
• High Voltage Gain.

FOTOVOLTAİK SİSTEMLER İÇİN YÜKSEK KAZANÇLI YALITIMSIZ YENİ BİR DA-DA YÜKSELTİCİ DÖNÜŞTÜRÜCÜ TASARIMI

Öz

Bu çalışmada, fotovoltaik sistemlerde kullanılmak üzere yeni bir yalıtımsız anahtarlamalı kapasitör ve aktif anahtarlamalı indüktör tabanlı DA-DA arttıran dönüştürücü önerilmiştir. Tasarlanan devrede yardımcı bir kapasitör kullanılarak özgün bir devre yapısı sunulmuştur. Önerilen dönüştürücü devre, giriş ve çıkış gerilimleri arasında yüksek bir gerilim kazancı sağlamaktadır. Ayrıca, MOSFET’ler üzerindeki gerilim zorlamaları önemli ölçüde azaltılmıştır. Bunun yanı sıra, devrede kullanılan kapasitörler ve indüktörler sayesinde hem anahtarlama elemanlarının (diyotlar ve MOSFET’ler) hem de çıkış akım ve gerilimindeki dalgalanmalar önemli ölçüde düşürülmüştür. Ayrıca önerilen devrede giriş akımının sürekliliği sağlanmıştır. Bu makalede, önerilen devreye ilişkin tüm analizler gerçekleştirilmiş ve tasarıma ait hesaplamaların tamamı ayrıntılı olarak açıklanmıştır. Önerilen devrenin performansı ve geçerliliği ise çalışma sonuçlarıyla desteklenmiştir.

Anahtar Kelimeler

• Anahtarlamalı Kapasitör
• Aktif Anahtarlamalı İndüktör
• Fotovoltaik Sistemler
• Yalıtımsız DA-DA Arttıran Dönüştürücü
• Yüksek Gerilim Kazancı

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