“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”

“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”

OBRIGADO DEUS PELA VIDA,PROTEGENOS E GUARDANOS DE TODO MAL


AUTOR DO BLOG ENG. ARMANDO CAVERO MIRANDA SAO PAULO BRASIL

segunda-feira, 9 de julho de 2012

Modern Transformerless Uninterruptable Power Supply (UPS) Systems


Modern Transformerless Uninterruptable Power Supply (UPS) Systems brahim Güne 1, Bülent Üstüntepe2, and Ahmet M. Hava3 1,2 ENEL Energy Electronics Company, 34794 Istanbul TURKEY igunes@enel.com.tr, bustuntepe@enel.com.tr 3 Department of Electrical and Electronics Engineering, Middle East Technical University, Ankara, TURKEY hava@metu.edu.tr Abstract Uninterruptable power supplies (UPS) are widely used to supply critical loads and provide reliable and high quality energy to the load. Until recently, on-line UPS systems with isolation transformer have been widely employed. However, transformerless modern UPS systems have been rapidly replacing the old technology due to their superior performance and size attributes. Transformerless UPS systems have utility friendly input performance and high quality output voltage waveform. Furthermore, smaller size, higher efficiency, and increased reliability are features that spread the transformerless products, rendering the transformer technology obsolete. In this paper, modern transformerless UPS systems with the 6-300kVA range will be discussed and their experimental performance will be illustrated. Input and output power quality performances, energy efficiency performance, and size/weight information will be provided on modern commercial transformerless UPS products.
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