Title :
Switching Frequency Limit for Soft-Switching MF Transformer System for AC-fed Traction
Author :
Kjellqvist, Tommy ; Norrga, Staffan ; Östlund, Stefan
Author_Institution :
R. Inst. of Technol., Stockholm
Abstract :
The migration to line side power conversion topologies comprising a medium frequency transformer in AC-fed propulsion systems may reduce size and weight of the conversion system. The switching frequency is a crucial factor affecting the viability of such a conversion system. An increased switching frequency of a mutually commutated conversion system comprising a medium frequency transformer employing soft switching is verified by single pulse measurements. A test bench to characterize standard IGBT modules under soft switching has been build and loss measurements on a 3.3 kV IGBT module are presented for hard and soft switching. A loss model of the investigated topology is developed and the maximum switching frequency for a converter equipped with the investigated module is estimated for hard and soft switching
Keywords :
AC-AC power convertors; commutation; electric propulsion; insulated gate bipolar transistors; power transformers; switching convertors; traction; zero current switching; zero voltage switching; 3.3 kV; AC-fed propulsion systems; AC-fed traction; crucial factor; hard switching; line side power conversion topologies; medium frequency transformer; mutually commutated conversion system; single pulse measurements; soft-switching MF transformer system; standard IGBT modules; switching frequency limit; Frequency conversion; Insulated gate bipolar transistors; Loss measurement; Measurement standards; Power conversion; Propulsion; Pulse measurements; Switching frequency; Testing; Topology;
Conference_Titel :
Power Electronics Specialists Conference, 2005. PESC '05. IEEE 36th
Conference_Location :
Recife
Print_ISBN :
0-7803-9033-4
DOI :
10.1109/PESC.2005.1581856
