<span lang="EN-US">Proper employment of Hybrid Wind/ PV system is often implemented near the load, and it is linked with the grid to study dynamic stability analysis. Generally, instability is because of sudden load demand variant and variant in renewable sources generation. As well as, weather variation creates several factors that affect the operation of the integrated hybrid system. So this paper introduces output result of a PV /wind via power electronic technique; DC chopper; that is linked to Iraqi power system to promote the facilitating achievement of Wind/ PV voltage. Moreover, PSS/E is used to study dynamic power stability for hybrid system which is attached to an effective region of Iraqi Network. The hybrid system is connected to Amara Old bus and fault bus is achieved to that bus and the stability results reflects that settling time after disturbance is not satisfactory. But, it is found that PV/wind generation system influences Iraqi grid stability to be better than that with only PV generation and the latter is better than stability of the grid that is enhanced with only wind generation. These results represent an important guideline for Iraqi power system planner.</span>
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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