Two-Stage Three-Phase Grid-Tied Photovoltaic System with MPPT Method

Year 2021, , 65 - 73, 15.12.2021

Mehmet Dayıoğlu , Yüksel Oğuz , Ahmet Yönetken

https://doi.org/10.53448/akuumubd.992064

Cited By: 1

Abstract

This paper examines the transfer of the power generated by the photovoltaic (PV) system to the three-phase alternating current (AC) power grid with maximum efficiency by controlling in two stages. With the designed PV system, it is aimed to transfer the energy received from the source with high efficiency to the network by using the maximum power point tracking (MPPT) method in order to ensure power stability. In addition, with a second control mechanism, the current at the output of the inverter is instantly controlled and the voltage value of the generated power is kept constant. Thanks to this control system, solar energy has been kept under control from electrical energy generation to its transfer to the power grid. In order to predict the quality of the generated power, the total harmonic distortion (THD) rate of the current at the output of the PV system was determined as a result of the simulations made in the computer environment. It is seen that the simulated PV system, according to the values of different solar radiation levels, tends to keep the voltage value of the power to be transferred to the grid constant at the desired level and that the THD value has been reduced below three percent at the time of maximum power generation.

Keywords

Photovoltaic System, Renewable Energy Sources, Maximum Power Point Tracking, DC-DC Converter, DC-AC Inverter, Power Grid

MPPT Yöntemi ile İki Aşamalı Üç Fazlı Şebeke Bağlantılı Fotovoltaik Sistem

Abstract

Bu bildiri, fotovoltaik (FV) sistem tarafından üretilen gücün, üç fazlı alternatif akım (AA) güç şebekesine maksimum verimle iki aşamada kontrol edilerek aktarılmasını incelemektedir. Tasarlanan FV sistemi ile güç kararlılığını sağlamak için kaynaktan yüksek verimle alınan enerjinin maksimum güç noktası izleme (MGNT) yöntemi kullanılarak ağa aktarılması amaçlanmaktadır. Ayrıca ikinci bir kontrol mekanizması ile evirici çıkışındaki akım anlık olarak kontrol edilmekte ve üretilen gücün gerilim değeri sabit tutulmaktadır. Bu kontrol sistemi sayesinde güneş enerjisi, elektrik enerjisi üretiminden elektrik şebekesine aktarılmasına kadar kontrol altında tutulmuştur. Üretilen gücün kalitesinin tahmin edilebilmesi için bilgisayar ortamında yapılan simülasyonlar sonucunda FV sistem çıkışındaki akımın toplam harmonik bozulma (THB) oranı belirlenmiştir. Simüle edilen FV sisteminin, farklı güneş ışınım seviyeleri değerlerine göre, şebekeye aktarılacak gücün voltaj değerini istenilen seviyede sabit tutma eğiliminde olduğu ve maksimum güç üretimi sırasında THB değerinin yüzde üçün altına düşürüldüğü görülmektedir.

Keywords

Fotovoltaik Sistem, Yenilenebilir Enerji Kaynakları, Maksimum Güç Noktası Takibi, DC-DC Çevirici, DC-AC Evirici, Güç Şebekesi

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