Three-Level Boost Converter-Based Single-Phase Five-Level T-Type Inverter

Abstract

This study proposes a cascaded power conversion structure composed of a three-level DC-DC boost converter and a single-phase five-level T-type inverter to address the high performance and power quality demands of renewable energy systems. The integrated topology is designed to overcome the limitations of conventional two-level architectures by combining high voltage gain with reduced voltage stress on power switches and minimized total harmonic distortion (THD). The paper presents a comprehensive mathematical model and a robust control strategy, utilizing decoupled loops for total DC-link voltage regulation and neutral-point balancing, alongside a synchronous reference frame current controller for the inverter stage. Simulation studies conducted in the MATLAB/Simulink environment validate the operational characteristics of the proposed system. The results demonstrate that the boost stage maintains a stable symmetric DC link voltage of 350𝑉𝑑𝑐 (∓175𝑉𝑑𝑐). Furthermore, the T-type inverter generates a five-level output waveform with a THD as low as 1.22% under steady-state conditions and 1.01% under dynamic loading, compliant with IEEE 519 standards. This confirms the system capability to reduce voltage stress on switches by 50% while ensuring high-quality power delivery. 

Keywords

• DC-AC conversion
• Three-level boost converter
• T-type inverter

Üç Seviyeli Yükseltici Dönüştürücü Tabanlı Tek Fazlı Beş Seviyeli T-Tipi İnverter

Abstract

Bu çalışma, yenilenebilir enerji sistemlerinin yüksek performans ve güç kalitesi taleplerini karşılamak için üç seviyeli bir DC-DC yükseltici dönüştürücü ve tek fazlı beş seviyeli T-tipi invertörden oluşan kademeli bir güç dönüştürme yapısı önermektedir. Entegre topoloji, yüksek voltaj kazancını güç anahtarlarındaki voltaj gerilimini azaltarak ve toplam harmonik bozulmayı (THB) en aza indirerek geleneksel iki seviyeli mimarilerin sınırlamalarının üstesinden gelmek üzere tasarlanmıştır. Makale, toplam DC bağlantı voltajı regülasyonu ve nötr nokta dengelemesi için ayrı döngüler kullanan kapsamlı bir matematiksel model ve sağlam bir kontrol stratejisi ile birlikte invertör aşaması için senkron referans çerçeve akım kontrolcüsünü sunmaktadır. MATLAB/Simulink ortamında yapılan simülasyon çalışmaları, önerilen sistemin çalışma özelliklerini doğrulamaktadır. Sonuçlar, yükseltici aşamanın 350𝑉𝑑𝑐 (∓175𝑉𝑑𝑐) kararlı simetrik bir DC bağlantı voltajını koruduğunu göstermektedir. Ayrıca, T-tipi invertör, IEEE 519 standartlarına uygun olarak, kararlı durum koşullarında %1.22 ve dinamik yükleme altında %1.01 kadar düşük THD ile beş seviyeli bir çıkış dalga formu üretir. Bu, sistemin yüksek kaliteli güç iletimini sağlarken anahtarlar üzerindeki voltaj stresini %50 oranında azaltma yeteneğini doğrular. 

Keywords

• DC-AC dönüşüm
• üç seviyeli yükseltici dönüştürücü
• T-tipi invertör

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