Fotovoltaik Uygulamalar İçin Alternatif Akım Tarafında Maksimum Güç Noktası Takibi

Bu çalışmada yenilikçi maksimum güç noktası takip (MPPT) yöntemi sunulmuştur. Alternatif Akım (AC)tarafında maksimum güç noktası takibi olarak adlandırılan bu yöntemde, eviricinin çıkış tarafında (AC)kontrol işlemi yapılmaktadır. AC tarafta kontrol işlemi için değiştir ve gözlemle (P/O) algoritmasıkullanılmıştır. P/O algoritması ile AC çıkış geriliminin genliği, nominal gerilimin ±% 20'si oranındadeğiştirilerek gerçekleştirilmektedir. Bu yolla, güneş panellerinin (PV) gerilimi maksimum güç noktasıbulunana kadar arttırılmakta ya da azaltılmaktadır. AC tarafta kontrol yöntemi ile DC/DC dönüştürücüMPPT işlemi yapmayacağından dönüştürücünün tek işlevi evirici giriş geriliminin düzenlenmesiolacaktır. DC/DC dönüştürücünün çıkış gerilimi her zaman sabit 800 V DC değerine sahiptir. Bu sayede,MPPT kontrolü ve anahtarlamadan kaynaklanan gerilim dalgalanmaları oluşmamakta ve buda küçükboyutlu (büyük W/cm 3 oranı) yarı iletken ve pasif devre elemanlarının kullanımına yol açmaktadır.Sürücünün diğer güç elektroniği modülleri, büyük W/cm 3 oranına sahiptir. AC tarafta MPPT yöntemi, buamacın gerçekleştirilmesine hizmet eden araçlardan biri olacaktır.

Maximum Power Point Tracking on the Alternative Current Side for Photovoltaic Applications

This paper represents an innovative Maximum Power Point tracking method. In this method which is named as “AC Side MPPT” as understood from the name control and switching will be realized at the AC side of the inverter. At the AC side a Perturb and Observe (P/O) method is implemented. Perturbation is realized as changing the amplitude of the AC output voltage with a ratio of ±20% of the nominal value. By this way the voltage of the solar panels is increased or decreased until the Maximum Power Point is captured. By means of this method, DC/DC converter does not deal with MPPT process, so the only function of the converter will be the regulation of the input. The output of the DC/DC converter always has a constant voltage value (800 VDC). By this way voltage ripples caused by the MPPT control and switching are not formed and this leads to utilizing of small sized semi conductor and passive components. Small sized components mean large W/cm 3 ratios. Other power electronic modules of the inverter have the large W/cm 3 ratio objectives. AC Side MPPT Method will be one of the tools which serve the realization of this purpose.

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