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Intermediate circuit capacitor-current in inverters for uninterruptible power supplies without transformer

  • In recent years the undisturbed electrical power supply became very important, because of the increasing automation (Schmidt, et al., 1995). A protected electrical power supply is possible by using a static uninterruptible power supply (UPS), because its electrical energy is stored in a DC-link intermediate circuit, connected with a battery. An important cost factor and power loss producer is the usually inserted line frequency output transformer. The elimination of the transformer causes a changing of the circuit topology and a rising of the DC-link voltage. It is possible to omit the transformer by connecting the ground wire of the load to the centre point of the DC-link capacitor. The DC-link voltage has to be higher than the sum of the peak value of the sinusoidal output voltage and the voltage drop of the output filter inductance at maximum load (e.g. U/sub d/= 800 V) (Patt, M, 2002). A second cost factor is the DC-link capacitor. Its reactive power capacity becomes bigger compared to conventional UPS because the low-frequencyIn recent years the undisturbed electrical power supply became very important, because of the increasing automation (Schmidt, et al., 1995). A protected electrical power supply is possible by using a static uninterruptible power supply (UPS), because its electrical energy is stored in a DC-link intermediate circuit, connected with a battery. An important cost factor and power loss producer is the usually inserted line frequency output transformer. The elimination of the transformer causes a changing of the circuit topology and a rising of the DC-link voltage. It is possible to omit the transformer by connecting the ground wire of the load to the centre point of the DC-link capacitor. The DC-link voltage has to be higher than the sum of the peak value of the sinusoidal output voltage and the voltage drop of the output filter inductance at maximum load (e.g. U/sub d/= 800 V) (Patt, M, 2002). A second cost factor is the DC-link capacitor. Its reactive power capacity becomes bigger compared to conventional UPS because the low-frequency load current flows through the centre point of the DC-link capacitors. This is an essential and an expenditure property (F. Renken et al., 2002). The centre of the paper is the analysis of the DC-link capacitor current in different topologies. In the first part of the analysis the current-loading of a two and a three level voltage source inverter will be described. In the second part of the paper a three phase two-level and a three phase three level-inverter will be compared.show moreshow less

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Metadaten
Author:Michael Patt
DOI:https://doi.org/10.1109/PESC.2004.1355182
Identifier:0-7803-8399-0 OPAC HS OPAC extern
Identifier:0275-9306 OPAC HS OPAC extern
Parent Title (English):35th Annual IEEE Conference on Power Electronics Specialists (PESC): 20-25 June 2004, Aachen, Germany
Publisher:IEEE
Place of publication:Piscataway
Document Type:conference proceeding (article)
Conference:IEEE 35th Annual Power Electronics Specialists Conference,20-25 June 2004, Aachen, Germany
Language:English
Date of Publication (online):2004/11/15
Year of first Publication:2004
Tag:ACDC
Volume:2004
Issue:Vol. 5
Article Number:8169536
First Page:3999
Last Page:4004
Institutes:Fakultät Elektrotechnik
ILE – Institut für Leistungselektronik
Dewey Decimal Classification:0 Informatik, Informationswissenschaft, allgemeine Werke
Research focus:FSP1: Energie
FSP2: Mobilität
Publication Lists:Patt, Michael
Publication reviewed:begutachtet
Release Date:2021/05/11
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