A tl¡esis subnritted to thc Faculty of Craduate Studies of the University of Ma¡ritoba in partial fulfillment of the requirenrents of tl¡e degree of MASTER OF SCIENCE @ t98 7 Permissio¡r has been granted to the LIBRARY OF THE UNIVERSITY OF MAN¡TOBA to lend or sell copies of this thesis, to the NATIONAL L¡BRARY OF CANADA to microfitm rhis thesis a¡rd to lend or sell copies of the fìlm, and UNIVERSITY MICROF¡LMS to publish an abstracr of this rhesis. The author reserves otl¡er publication rights, and neither the thesis nor extensive extracts from it may be printed or otherwise reproduced without the author's writte¡l permission. by HVDC simulator at the University of Manitoba for verifying the performance with different protection schemes. Oigital simulation with the EMTDC program was also performed to compare the results with those achieved from analog simulation. The system was able to recover from a fault within about 1.5 second as can be seen from the results.