Design of a non-isolated charging unit of an off-grid PV supported electric vehicle charging station

Abstract

Due to geopolitical risks and the consequent rising fossil fuel costs, the interest in electric vehicles is increasing. The widespread use of electric vehicles causes an increase in charging stations and an increase in the load on the electricity grid. For this reason, it becomes necessary to design new charging systems. In this study, the charging unit in an electric vehicle charging system supported by solar energy was designed in Matlab/Simulink environment. Instead of insulated (transformer) DC-DC converters used in charging units, non-isolated (power electronic circuit) multi-stage boost converters are used in the designed charging unit. Thus, if the transformers in not of use; transformer losses (heat losses that will occur in transformer coils) are zeroed, it is aimed to reduce the size of the circuits used and to reduce the system cost. The graphics of the data of the designed system were given and comments were made.

Keywords

• Photovoltaic energy
• Power electronic
• Multi-phase boost converter
• Electrical vehicle charging station.

İzolesiz bir off-grid PV destekli elektrikli araç şarj istasyonunun şarj ünitesi tasarımı

Öz

Jeopolitik riskler ve buna bağlı olarak artan fosil yakıt maliyetleri nedeniyle, elektrikli araçlara olan ilgi giderek artmaktadır. Elektrikli araçların yaygınlaşması, şarj istasyonlarının artmasına, beraberinde elektrik şebekesi üzerindeki yükün artmasına sebep olmaktadır. Bu sebeple yeni şarj sistemlerinin tasarımlarının yapılması gerekli hale gelmektedir. Bu çalışmada, güneş enerjisi ile desteklenmiş bir elektrikli araç şarj sisteminde bulunan şarj ünitesinin Matlab/Simulink ortamında tasarımı yapılmıştır. Şarj ünitelerinde kullanılan izoleli (transformatörlü) DC-DC dönüştürücüler yerine, tasarlanan şarj ünitesinde izolesiz (güç elektronik devreli), çok katlı yükseltici dönüştürücü kullanılmıştır. Böylece transformatörlerin kullanılmamasıyla birlikte; trafo kayıpları (transformatör bobinlerinde meydana gelecek ısı kayıpları) sıfırlanmış, kullanılan devrelerin boyutlarının azaltılması ve sistem maliyetinin düşürülmesi hedeflenmiştir. Tasarlanan sisteme ait verilerin grafikleri verilerek yorumları yapılmıştır.

Anahtar Kelimeler

• Fotovoltaik enerji
• Güç elektroniği
• Çok fazlı boost dönüştürücü
• Elektrikli araç şarj istasyonu
• Photovoltaic energy
• Power electronic
• Multi-phase boost converter
• Electrical vehicle charging station.

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