۱- Introduction

۲- Project phases of ITER PF converter

۳- Preliminary design of ITER PF converter unit

۴- Final design of ITER PF converter

۵- Design validation

۶- Manufacture, FAT and delivery

۷- Conclusion

References

Abstract

ITER PF converter system is the largest converter system in the world. This special converter has the mutual superconductive coils as load, and requires large scale and rapid response. The institute of plasma physics Chinese academy of sciences (ASIPP) is responsible for this converter’s preliminary design, final design, and manufacture. To meet these special requirements, during design and manufacture phase, quality assurance (QA) and quality control (QC) actions are worked out and strictly performed to ensure the validity of the product.

Introduction

ITER converter system is the largest converter system in the world with mutual superconductive coils as loads. The output voltage of converter can be adjusted in the range of millisecond according to the plasma control requirement. In the case of system fault, the converter system should respond in real-time and with high reliability to guaranty the safety of the coils and the tokamak machine [1]. The comparisons with common 100 MW class large capacity industrial converters are listed in Table 1. ITER PF converter system is composed of 14 converter units which should be able to operate in 12-pulse, four-quadrant. Each converter unit provides the rated DC current of 55 kA and the rated on-load voltage of 1050 V [2,3].When the AC supply is between 62 kV and 72 kV, the converter bridge would provide the symmetrical voltage response not more than 2 electrical cycles (40 ms) for full scale change (from 1050 V to -1050 V or vice versa). In terms of the fault suppression capability, the converter structure should not be damaged in the case of short-circuited upstream the DC reactor, while for the short-circuited downstream the DC reactor, neither the converter module nor the electronic device could be damaged [4].