The active NPC converter for medium-voltage applications

The three-level neutral point clamped voltage source converter (NPC VSC) is widely used in high-power, medium-voltage applications. To overcome its major drawback-the unequal loss distribution among the semiconductors-the use of active NPC switches (ANPC) was proposed previously. In this paper, a simple feedforward loss-control scheme for the ANPC converter is presented. The principle of operation of the ANPC VSC is verified experimentally for the first time. Electrical measurements on a low-voltage test bench prove the proper function of the ANPC converter. Infrared junction temperature measurements confirm the improved loss distribution. Finally, the authors demonstrate the superior performance of the ANPC converter in various medium-voltage applications.

[1]  J. K. Steinke,et al.  A reliable, interface-friendly medium voltage drive based on the robust IGCT and DTC technologies , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[2]  Abb Switzerland,et al.  Large area IGCTs with improved SOA , 2004 .

[3]  D. G. Holmes,et al.  Optimal pulse-width modulation for three-level inverters , 2005, IEEE Transactions on Power Electronics.

[4]  기요지 아오시마,et al.  Bridge converter circuit , 1980 .

[5]  T. Bruckner,et al.  Loss balancing in three-level voltage source inverters applying active NPC switches , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[6]  S. Bernet,et al.  Estimation and measurement of junction temperatures in a three-level voltage source converter , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[7]  Hirofumi Akagi,et al.  A New Neutral-Point-Clamped PWM Inverter , 1981, IEEE Transactions on Industry Applications.

[8]  Steffen Bernet,et al.  The active NPC converter and its loss-balancing control , 2005, IEEE Transactions on Industrial Electronics.

[9]  P.K. Steimer,et al.  Very High Power IGCT PEBB technology , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.