Title :
A three-phase soft-switched isolated AC/DC converter without auxiliary circuit
Author :
Norrga, Staffan ; Meier, Stephan ; Östlund, Stefan
Author_Institution :
R. Inst. of Technol., Stockholm, Sweden
Abstract :
An AC/DC converter topology comprises a voltage source converter (VSC) with capacitive snubbers and a 2-phase by 3-phase cycloconverter, connected by an MF transformer. By alternately commutating the two converters it is possible to achieve soft switching conditions for all of the semiconductor elements. Furthermore, it is shown that resonant commutation of the voltage source converter is possible by utilizing the cycloconverter in order to momentarily short-circuit the transformer terminals. This allows for soft commutation of the VSC down to zero load. Furthermore, the design and operation of a 40 kVA prototype converter system based on the studied concept is described.
Keywords :
AC-DC power convertors; commutation; cycloconvertors; power transformers; resonant power convertors; snubbers; switching convertors; 40 kVA; AC-DC converter; MF transformer; VSC; capacitive snubber; cycloconverter; resonant commutation; semiconductor element; soft commutation; soft switching condition; voltage source converter; Analog-digital conversion; Circuits; DC-DC power converters; Filters; Isolation technology; Phase transformers; Power conversion; Snubbers; Switching converters; Switching loss;
Conference_Titel :
Industry Applications Conference, 2004. 39th IAS Annual Meeting. Conference Record of the 2004 IEEE
Print_ISBN :
0-7803-8486-5
DOI :
10.1109/IAS.2004.1348710
