My PhD thesis entitled, "A Hybrid Computer Simulator for H.V.D.C. Systems" was submitted in 1971, although most of the design and practical work had been carried out between 1966 and 1969, at which time all working HVDC systems were based on mercury arc technology, although experiments were being made with thyristor converters.

DC transmission is now the preferred option for asynchronously linking distributed power generators such as wind farms and (the more sensible) open turbine tidal generators. 

Although the above thesis dealt with what is now obsolete technology, the logic system developed then is still relevent to modern converters today. Accordingly two papers which were published in 1969/70 and appended to my thesis 
are posted here in the hope that they may be of use to somebody.


M.A.C - Dec 2011