| Abstract |
This paper presents a new 3-level inverter system applying 6-inch 6.0kV/5.0kA RCGCT for large
capacity adjustable speed drives. The main circuit topology is well-known as a neutral-point-clamped
inverter, so-called NPC inverter. In this field of application, improving power conversion efficiency is
important, however, compatibility between large capacity and compactness is also strongly required by
customers. For realization of the compatibility, the reverse conducting gate commutated turn-off
thyristors (so-called RCGCTs) have been newly applied to the inverter system The rated output
capacity is 8MVA, and the overload capacity is 12MVA. The inverter system consists of 3-level
RCGCT units with high maintainability. As a result of squeezing the volume, the rated output power
density of 1MVA/m3 has been realized. |
