DEVELOPMENT AND TESTING OF PROTOTYPE MODELS FOR A HIGH-PERFORMANCE 300 MW SELF-COMMUTATED AC DC CONVERTER/

A technical project is under way in Japan to develop a high-performanc e self-commutated converter for future HVDC transmission and de interc onnection. In the first stage of the project, prototype converter mode ls for a 300MW self-commutated converter were developed. The models we re subjected to factory testing to verify the technology for series co nnection of a large number of gate turnoff thyristors (GTOs), a gate p ower supply from the high voltage main circuit, and regeneration of en ergy in snubber circuits. Satisfactory results were obtained.