Design and Control of Single-Phase Double-Stage PV-MPPT System

Year 2024, Volume: 12 Issue: 4, 2050 - 2061, 23.10.2024

Emre Avcı

https://doi.org/10.29130/dubited.1484226

Abstract

In the double-stage Photovoltaic-Maximum Power Point Tracking (PV-MPPT) systems, the performance of each stage and the MPPT algorithm may affect the system performance. This study gives the design and control of a single-phase double-stage PV-MPPT system with a cascade controller. For the DC-link voltage control, a classical PI controller is employed. However, double-line frequency harmonic emerges inherently in the DC-link voltage. This voltage harmonic causes a third harmonic in the injected grid current. Therefore, a proportional multi-resonant controller is used in the inner current loop controller to control the grid current and suppress the third harmonic. The designed system's steady-state and dynamic performance are tested under different PV power and sudden power changes. The simulation results show that the injected grid current is in phase with the grid voltage and has a low THD value. Also, the DC-link voltage is stable under even sudden power changes. The results prove the effectiveness of the designed system.

Keywords

PV, Photovoltaic, Double-stage, MPPT, Grid

Tek-Fazlı Çift-Aşamalı FV-MGNT Sisteminin Tasarımı ve Kontrolü

Abstract

Çift aşamalı Fotovoltaik-Maksimum Güç Noktası Takip (FV-MGNT) sistemlerinde her aşamanın ve MGNT algoritmasının performansı sistem performansını etkileyebilmektedir. Bu çalışma kaskat kontrolcülü tek-fazlı çift-aşamalı FV-MGNT sisteminin tasarım ve kontrolünü sunmaktadır. Dc bara gerilimi için klasik bir PI kontrolcüsüne yer verilmiş. Fakat DC bara geriliminde şebeke frekansının iki katı büyüklüğünde bir gerilim harmoniği doğal olarak ortaya çıkar. Bu nedenle, şebeke akımını kontrol etmek ve üçüncü harmoniği bastırmak için iç akım döngüsünde oransal çoklu rezonans kontrolörü kullanılmıştır. Tasarlanan sistemin kararlı durum ve dinamik performansı, farklı FV gücü ve ani güç değişimleri altında test edilmiştir. Simülasyon sonuçları, şebeke basılan akımının şebeke gerilimi ile aynı fazda olduğunu ve düşük bir THD değerine sahip olduğunu göstermektedir. Ayrıca DC bara gerilimi ani güç değişimlerinde kararlı kalmıştır. Sonuçlar tasarlanan sistemin etkinliğini kanıtlamaktadır.

Keywords

FV, Fotovoltaik, Çift-Aşamalı, MGNT, Şebeke

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