ÜNİFORM IŞINIM KOŞULLARI İÇİN BİR HİBRİT AKIM MODÜLASYONLU ÇİFT AKTİF KÖPRÜ FOTOVOLTAİK DC/DC DÖNÜŞTÜRÜCÜNÜN ANALİZİ

Öz

Fotovoltaik (PV) modüllerin enerjisi yüksek dönüşüm oranlı güç elektroniği dönüştürücüleri ile DC şebekeye bağlanabilir. Genellikle bu amaç için iki-aşamalı izoleli boost-tabanlı dönüştürücüler kullanılmaktadır. Fakat bu tipteki dönüştürücüler, yüksek gerilim seviyelerine dayanması gereken yüksek sayıda yarı-iletken anahtar içermekte ve yüksek endüktans değerine sahip büyük manyetik nüve boyutlu giriş bobini kullanmaktadır. Bu problemleri çözmek için, tek-aşamalı hibrit akım modülasyonlu çift aktif köprü (DAB) izoleli dönüştürücü literatürde önerilmiştir. Fakat bu dönüştürücü kısmi gölgeleme (PS) dikkate alınarak tasarlanmıştır ve PS PV tarlalarında nadiren oluşmaktadır. Bu çalışmada, DAB PV DC/DC dönüştürücün PV tarla çalışmalarında daha uygun olan üniform ışınım (UI) koşulları için tasarım metodolojisi verilmiştir. Ek olarak, HCM DAB PV DC/DC dönüştürücünün UI ve PS’ye ait tasarımları birbiri ile karşılaştırılmıştır. Analizler göstermektedir ki UI-tabanlı tasarım PS-tabanlı tasarıma göre %3.88 daha küçük RMS2akım, %3.56 daha küçük tepe akımı, %2.35 daha küçük nüve boyutuna sahiptir. Dolayısı ile UI-tabanlı tasarım daha verimli, daha ucuz ve boyut açısından daha küçük olabilir.

Anahtar Kelimeler

• Çift aktif köprü (DAB) dönüştürücü
• hibrit akım modülasyonu (HCM)
• Fotovoltaik (PV) enerji dönüşümü
• Üniform ışınım koşulları

ANALYSIS OF A HYBRID CURRENT MODULATED DUAL ACTIVE BRIDGE PHOTOVOLTAIC DC/DC CONVERTER FOR UNIFORM IRRADIATION CONDITIONS

Öz

The energy of Photovoltaic (PV) modules can be connected to DC grid with high step-up ratio power electronics converters. Generally, two-stage isolated boost-based converters are used for this purpose. However, these types of converters consist of a high number of semiconductors which must withstand high voltage levels, and they utilize input inductance which has high value and large magnetic core size. To solve these problems, single-stage conversion-based Hybrid Current Modulated (HCM) isolated Dual Active Bridge (DAB) converter is proposed in the literature. However, this converter is designed for considering partial shading (PS), and PS rarely occurs in PV farms. In this study, the design methodology of DAB PV DC/DC converter is given for uniform irradiation (UI) conditions that is more suitable for PV farms. In addition, UI and PS designs of HCM DAB PV DC/DC converter are compared to each other. Analyses show that UI-based design has 3.88% smaller RMS2 current, 3.56% smaller peak current and 2.35% smaller core size than the PS-based design. Hence, UI-based design can be more efficient, cheaper, and smaller in size.

Anahtar Kelimeler

• DAB converter
• Hybrid current modulation (HCM)
• Photovoltaic (PV) energy conversion
• Uniform Irradiation (UI) conditions

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