Design and Control of a Multi-Input Transformer-Based Inverter Producing 27 Levels from a Single Source

Öz

The need for multiple DC bus voltages in multi-level inverters (MLIs) increases the cost and complexity of the system. A solution to this problem is to include the voltages in the system in isolation by using High Frequency Link (HFL). In the conventional usage of HFL, the square wave signal is generated by an H-bridge. In this study, the transformer is set to 3 primary windings by using two H-bridges used before HFL. Thus, the voltage obtained from HFL is diversified and 27 level output is obtained from the PUC circuit that can produce 7 levels. In addition, the cuckoo optimization algorithm is used for the transformer winding numbers to minimize the inverter voltage THD. The proposed 27-level topology is verified by testing it with outputs at different frequencies and amplitudes using an inductive filter. Simulation findings show that the multi-input transformer in the proposed topology can be applied to other innovative and competitive MLI circuits.

Anahtar Kelimeler

• High-Frequency Link
• Multi-Level Inverter
• Inverter
• Multi-Input Transformer

Tek Kaynaktan 27 Seviye Üreten Çok Girişli Transformatör Tabanlı Evirici Tasarımı ve Kontrolü

Öz

Çok seviyeli eviricilerde (ÇSE) çoklu DA bara gerilimlerine duyulan ihtiyaç, sistemin maliyetini ve karmaşıklığını artırmaktadır. Bu soruna yönelik bir çözüm yolu, Yüksek Frekans Bağlantısı (YFB) kullanılarak gerilimlerin izole olarak sisteme dahil edilmesidir. YFB'nin alışılagelmiş kullanım şeklinde, kare dalga sinyali bir H-köprüsü tarafından üretilir. Bu çalışmada ise, YFB öncesinde kullanılan H-köprü iki tane kullanarak transformatör 3 birincil sargılı ayarlanmıştır. Böylece YFB'den elde edilen voltaj çeşitlendirilerek, 7 seviye üretebilen PUC devresinden 27 seviye çıkış alınmıştır. Ayrıca evirici gerilim THB’sinin minimum olması için transformatör sargı sayıları guguk kuşu optimizasyon algoritması kullanılmıştır. Önerilen 27 seviyeli topoloji, bir endüktif filtre kullanılarak farklı frekans ve genlik değerlerindeki çıkışlarla test edilmek suretiyle doğrulanmıştır. Simülasyon bulguları, önerilen topolojideki çok girişli transformatörün yenilikçi ve rekabetçi diğer ÇSE devrelerine uygulanabilirliğini göstermektedir.

Anahtar Kelimeler

• Yüksek Frekans Bağlantısı
• Çok Seviyeli Evirici
• Evirici
• Çok Girişli Transformatör

Kaynakça

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