The use of HVDC in transmission system is an important technique to improve AC power system performance.PSS/E software is a conventional package used to simulate power system, from which power flow study that involves numerical analysis of power system displays convergence progress.Short circuit activity enables engineer to decide the proper location of HVDC links in order to obtain the best minimization of short circuit currents overall buses in the grid.In this paper PSS/E is used for modelling monopolar and bipolar DC lines in an effective region of Iraqi super grid, in second hand, makes comparative studies to test location for short circuit levels (SCLs) between actual AC and AC/DC case study as part of Iraqi national grid.The finding of this article appears that the addition of DC link leads to power improvement, with the fact that SCL is reduced with bipolar line installation rather than monopolar line.
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Lafta et al. (2018) studied this question.