| Abstract |
This paper proposes an improved 3-level GCT converter for large capacity adjustable speed drives. The
main circuit topology of the 3-level converter is also well-known as a neutral-point-clamped converter.
In this field, improving power conversion efficiency and increasing power conversion capacity are very
important subjects to solve. Realizing high efficiency, a regenerative voltage clamping circuit is newly
applied. And introducing a transient junction temperature analysis of power devices, the maximum output
capacity is ensured. These technologies can contribute to improvement of the 3-level GCT converter
especially using 6kV/6kA GCTs which is the maximum capacity in the world at this moment. |
