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Modeling And Comparison Of Micro Inverter And String Inverter In Photovoltaic Systems

Diğer Başlık: Modeling And Comparison Of Micro Inverter And String Inverter In Photovoltaic Systems

Oluşturulma Tarihi: 08-11-2019

Niteleme Bilgileri

Tür: Tez

Alt Tür: Yüksek Lisans Tezi

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): Makina mühendisliği ve makinalar,

Yazar(lar): Durmuş, Gizem Nur Bulanık (Yazar),

Emeği Geçen(ler): Aslan, Özgür (Tez Danışmanı),


Yayın Tarihi: 09-07-2019


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Anahtar Kelimeler

micro-inverter, string-inverter, photovoltaic, solar energy


Özet

Photovoltaic panels are structures that convert solar energy directly into electrical energy using photovoltaic cells connected in series and parallel.  Several reasons are affecting photovoltaic panel efficiency negatively. Shading on the panel temporarily or permanently is one of the reason reduction of the efficiency. Panels can be exposed to the shading due to the clouding, buildings, or any other obstacles like dust, bird or leaf. Additionally, constant shadowing generates a hot spot effect. This situation causes some failures in the long-term on the panel or the panel group. Another problem is about connecting photovoltaic panels. In mostly, photovoltaic panels are connected in series at the plant-based systems. Serial connected panels reach very high voltages, and the high voltage based failure can occur. In these systems, photovoltaic panels can be arranged in limited ways in photovoltaic systems where the string inverter is used. Conversely, micro inverters are panel based systems and more comfortable to install. There is not any necessity to arrange the panels concerning the inverter. Although microinverters are preferred for small scale photovoltaic systems, in some cases, they are used for large scale photovoltaic systems. Since each panel produces its own AC power, the high voltage problem is eliminated. However, due to their high costs and lower efficiencies, they are not preferred especially in large scale plants. In this thesis, considering these problems, 24 kWp installed power photovoltaic system in Ankara Province was simulated with three different shading densities with both string and micro inverters and these simulations were compared.



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