Tek fazlı şebeke bağlantılı transformatörsüz PV evirici sistem kontrolü

Year 2019, Volume: 25 Issue: 2, 143 - 150, 22.04.2019

Ahmet Yüksel Emre Özkop

Abstract

Bu çalışma,
çok verimli ve güvenli evirici konseptli transformatörsüz eviricili şebeke
bağlantılı fotovoltaik maksimum güç noktası takip sisteminin kontrolünün
benzetim performansını sunmaktadır. Güç ve gerilimin değişimini temel alan dürt
ve gözlemle tekniği, fotovoltaik birim sisteminden maksimum güç elde etmek için
kullanılmaktadır.

DA-DA yükselten çevirici bu teknik ile çevirici anahtarına ait PWM sinyalinin
doluluk oranı değiştirilerek uygulanmaktadır. Tek fazlı çok verimli ve güvenli
evirici konseptli transformatörsüz evirici, şebekeye güç akışını sağlamaktadır.
Evirici kontrolü, şebeke gerilimi ve akımı ve ayrıca DA-DA yükselten çevirici
çıkış gerilim değerlerine dayanmaktadır. Sistem performansı, PV modül ve DA-DA
yükselten çevirici çıkış gerilim ve akımları, şebeke akımı ve gerilimi, kaçak
akım, aktif ve reaktif güçler ve güç verim karakteristiği yönünden
değerlendirilmektedir. Önerilen sistemde benzetim sonuçları HERIC evirici için
maksimum verimini %97.96, Avrupalı verimini %96.84 ve Kaliforniyalı verimini
%97.60 olarak 20 kHz anahtarlama frekansında göstermektedir.

Keywords

MPPT, Transformatörsüz evirici, PV, Şebeke bağlantılı

Control of single phase grid connected transformerless PV inverter system

Abstract

This
paper presents the simulation performance of control of a grid-connected
photovoltaic maximum power point tracking system with highly efficient and
reliable inverter concept transformerless inverter. Perturb and Observe
technique based on variation of power and voltage is used to extract maximum
power from photovoltaic power system. A dc-dc boost converter is applied with
the technique by changing duty ratio of the PWM signal of the converter switch.
A single-phase highly efficient and reliable inverter concept transformerless
inverter provides a power flow into grid. The control of the inverter is based on
the grid voltage and current and also dc-dc boost converter output voltage
values. The system performance is evaluated in terms of PV module and dc-dc
boost converter output voltages and currents, grid current and voltage, leakage
current, active and reactive powers and power efficiency characteristics. The
simulation results show 97.96% maximum efficiency, 96.84% European efficiency
and 97.60% Californian efficiency with 20 kHz switching frequency for the HERIC
inverter on the proposed system. 

Keywords

MPPT, Transformerless inverter, PV, Grid-Connected

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