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A NEW THREE PHASE INVERTER WITH LOW DISTORTION FOR UNINTERRUPTABLE POWER SUPPLY APPLICATIONS

KGK UYGULAMALARI İÇİN DÜŞÜK DİSTORSİYONLU YENİ BİR ÜÇ FAZ EVİRİCİ

Journal Name:

  • Istanbul University Journal of Electrical & Electronics Engineering

Publication Year:

  • 2002

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
The ways of providing low distortion in inverter or UPS applications without using large and high cost filters are whether applying PWM technique [1] or producing several appropriate steps on the output waveform called as multilevel operation. Combining both methods multilevel PWM technique is achieved [2] [3]. But, in this method, in order to reduce harmonics, it is necessary to increase the number of pulses at the output waveform. It is obvious that it causes an increase of power losses in the switching components particularly during ON/OFF transitions. Additionally in PWM applications, the harmonic distortion depends on the pulse widths due to output regulation need. In this study, a new three phase multilevel inverter using chopper technique will be presented.
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Abstract (Original Language): 
Evirici içeren bir sistemde örneðin bir Kesintisiz Güç Kaynaðýnda çýkýþlarýnda büyük ve pahalý filtreler kullanmadan harmoniði azaltmanýn çeþitli yöntemleri vardýr.Bunlardan en yaygýn olanlarý Darbe Geniþlik Yönteminin uygulanmasý ile uygun basamaklardan oluþmuþ çok seviyeli çalýþma biçimidir.Bu iki yöntem birleþtirildiðinde artýk çok seviyeli bir Darbe Geniþlik Modulasyonlu iþaretten söz edilebilir.Fakat çýkýþtaki harmoniði yeterince azaltmak için basamaklardaki darbe sayýsýný arttýrmak bir baþka ifade ile frekansý arttýrmak gereklidir.Bu ise doðal olarak iletim ve kesim geçiþlerindeki anahtarlama kayýplarýnýn yükselmesi demektir.Öte yandan böyle bir eviricide gerilim ayarý yapabilmek için darbe geniþliklerinin deðiþtirilmesi bir zorunluluktur.Bu çalýþmada DC kýyýcý kullanan mikrodenetleyici destekli, çok seviyeli üç fazlý bir Kesintisiz Güç Kaynaðý tasarlanýp gerçekleþtirilerek sözü edilen sakýncalarýn giderilmesine çalýþýlmýþtýr.
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  • 1
377-382
  • English

REFERENCES

References: 

[1] J.B. Castael and R.G Hoft, “Optimum PWM
waveforms of a microprocessor controlled
inverter”, in conferance Rec.IEEE, 1978 Power
Electronics Specialists Conference,Syracuse, NY
78 CH,1337-5 AES
[2] Pradeep M.Bhagwat & V.R.Stefanovic,
“Generalized Structure of a Multilevel Inverter “
IEEE Transactions on Industry Applications,
VOL. I-19 No:6 November/December 1983
[3] A Multilevel PWM Inverter Topology for
Photovoltaic Applications ISIE 1997 Guimareaes
Portugal V.G. Agelidis p589-594
[4] C.W.Flairty, “ A 50kVA adjustablefrequency
3-phase controlled rectifier inverter”
AIEE Ind.Electronics Symp. Boston, MA,
September 20-21, 1961
[5] Erhan Tunali “A New Three Phase Inverter
with low distortion for unintrerruptable power
Supply Applications” Ph Thesis,Technical
University of Yildiz, 1998

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