Design of a D Q Axis Controlled Micro Inverter with Flyback Converter for Grid Connected PV Systems

Öz

Inverters are one of the most important components of photovoltaic (PV) systems. Inverters are utilized as an operational interface between PV panels and the power grid or residential applications. In order to provide high system efficiency and reliable power transfer from PV panels, intensive studies have been conducted on the power circuit topologies and control structures of these inverters. In this paper, a two-stage grid-connected microinverter is designed. There is a flyback converter on the DC-DC side and a full-bridge inverter structure on the DC-AC side. The designed microinverter has the ability to amplify the input voltage. The DC voltage amplified at the inverter output is converted at the output of the microinverter to be suitable for the grid. The flyback converter is controlled by a maximum power point tracking (MPPT) algorithm and a PI controller. On the other side, the full-bridge inverter section is controlled by a D-Q axis controller. The system response is analyzed under different irradiance values. The control structures created in the designed microinverter accurately tracked the maximum power point, and maximum power transfer to the grid is observed according to different irradiance values.

Anahtar Kelimeler

• Photovoltaic panel
• maximum power point tracking
• flyback converter
• microinverter
• D-Q axis control

Şebekeye Bağlı FV Sistemler için Flyback Dönüştürücülü D-Q Eksen Kontrollü Mikro Evirici Tasarımı

Öz

Fotovoltaik (FV) sistemlerin en önemli bileşenlerinden biri eviricilerdir. Eviriciler FV paneller ile elektrik şebekesi veya konut uygulamaları arasında operasyonel bir arayüz görevi görmeleri nedeniyle kullanılmaktadır. Yüksek sistem verimliliği ve FV panellerden güvenilir güç aktarımı sağlanması için bu eviricilerin güç devresi topolojileri ve kontrol yapılarına yönelik yoğun çalışmalar yapılmaktadır. Bu makalede iki aşamalı şebekeye bağlı bir mikroevirici tasarımı yapılmıştır. DC-DC tarafında flyback dönüştürücü, DC-AC tarafında ise tam köprü evirici yapısı bulunmaktadır. Tasarlanan mikroevirici giriş voltajını yükseltme kabiliyetine sahiptir. Çevirgeç çıkışında yükseltilen DC gerilim mikroevirici çıkışında şebekeye uygun olacak şekilde dönüştürülmüştür. Flyback dönüştürücü maksimum güç noktası takibi (MGNT) algoritması ve PI kontrolör ile kontrol edilmiştir. Diğer yandan tam köprü evirici bölümü D-Q eksenli kontrolör ile kontrol edilmektedir. Sistem tepkisi farklı ışınım değerleri altında test edilmiştir. Tasarlanan mikroeviricide oluşturulan kontrol yapıları sayesinde maksimum güç noktası doğru bir şekilde izlenmiş ve farklı ışınım değerlerine göre şebekeye maksimum güç aktarımının sağlandığı gözlemlenmiştir.

Anahtar Kelimeler

• Fotovoltaik panel
• maksimum güç noktası takibi
• flyback dönüştürücü
• mikroevirici
• D-Q eksenli kontrol

Kaynakça

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