A Cost-Effective and High-Efficiency Novel 15-Level Hybrid MLI Topology for Renewable Energy Systems

Abstract

In this paper, a new hybrid model for single DC source multilevel inverters (MLIs) is proposed. The proposed switched diode (SD) and high frequency link (HFL) hybrid structure utilizes a single DC source voltage and supplies multiple DC voltages to the PUC circuit. The MLI generates 15 levels in the output voltage waveform using only 8 power switches. It reduces the control complexity and provides a cost-effective solution with a low-cost function (CF) value of 2.71. A comprehensive comparison with recent work in literature has been made. Unlike most studies, it uses HFL for voltage gain. Most of the load current is drawn directly from the input source and a small portion is drawn through the high frequency transformer. This significantly reduces transformer size and costs. In tests with inductive loads, the output is near pure sinusoidal waveform. The total harmonic distortion (THD) is measured as 1.41% with a low inductive load of 50Ω + 25mH. Inverter efficiency is 96.48% in loss analysis with PLECS. The voltage peaks that occur during polarity transitions were eliminated by using controlled power switches instead of diodes and a stabilized output was obtained.

Keywords

• Multilevel Inverters (MLIs)
• Cost Function
• Total Harmonic Distortion (THD)
• High-Frequency Link
• Switched-Source
• Switched-Diode

Yenilenebilir Enerji Sistemleri için Düşük Maliyetli ve Yüksek Verimli Yeni Bir 15 Seviyeli Hibrit MLI Topolojisi

Öz

Bu makalede, tek DC kaynaklı çok seviyeli invertörler (ÇSE) için yeni bir hibrit model önerilmektedir. Önerilen anahtarlamalı diyot (AD) ve yüksek frekans bağlantısı (YFB) hibrit yapısı, tek bir DC kaynak gerilimi kullanır ve PUC devresine çoklu DA gerilimleri sağlar. ÇSE, yalnızca 8 güç anahtarı kullanarak çıkış voltajı dalga formunda 15 seviye üretir. Kontrol karmaşıklığını azaltır ve 2,71'lik düşük maliyet fonksiyonu (MF) değeriyle uygun maliyetli bir çözüm sağlar. Literatürdeki son çalışmalarla kapsamlı bir karşılaştırma yapılmıştır. Çoğu çalışmanın aksine, gerilim kazancı için YFB kullanır. Yük akımının çoğu doğrudan giriş kaynağından çekilir ve küçük bir kısmı yüksek frekans transformatörü üzerinden çekilir. Bu, transformatör boyutunu ve maliyetlerini önemli ölçüde azaltır. Endüktif yüklerle yapılan testlerde, çıkış neredeyse saf sinüzoidal dalga biçimindedir. Toplam harmonik bozulma (THB) 50Ω + 25mH düşük endüktif yük ile %1,41 olarak ölçülmüştür. PLECS ile yapılan kayıp analizinde invertör verimliliği %96,48'dir. Polarite geçişleri sırasında oluşan gerilim pikleri diyot yerine kontrollü güç anahtarları kullanılarak giderilmiş ve stabilize bir çıkış elde edilmiştir.

Anahtar Kelimeler

• Anahtarlamalı Diyot
• Anahtarlamalı Kaynak
• Çok Seviyeli Evirici (ÇSE)
• Maliyet Fonksiyonu (MF)
• Toplam Harmonik Bozulma (THD)
• Yüksek Frekans Bağlantısı (YFB)

Kaynakça

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