A modified back-to-back HVdc system for 36-pulse operation

Recently back-to-back HVdc systems have greatly increased. They interconnec t large power systems offering numerous technical and economic benefits. Th e design of AC system filters, however, is not an easy task. Also, filters do not remove all the harmonics for which they are tuned, are costly and ha ve a complicated transient behavior. In this paper a 36-pulse filterless co nfiguration for back-to-back HVde systems is proposed, whereby harmonics ar e eliminated within the converter, thus opening the possibility of advantag es in aspects of design, reliability and capital savings.