The increasing use of renewable energy sources (RES) and their integration into transmission systems requires extensive studies to get more benefits from these sources. Stability analysis is one of the most crucial issues in these systems, and therefore needs to be studied in depth. In this paper, an analytical study was conducted for the stability assessment of the Iraqi super grid after adding a solar power plant with a capacity of 1000 MW using both HVAC and HVDC links for comparison purposes. Thus, the objective of this study was to determine the best way to integrate RES into the power grid while improving its performance. The system’s stability was evaluated for two types of faults: line and bus disturbances. The strength of the grid and its ability to absorb the newly added energy was also studied. The simulations were performed with the PSS/E software using the Newton-Raphson method for a 500 km transmission line length. The results showed that the HVDC link outperforms the HVAC link in improving the overall performance of the power system.

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Obvious technological and economic advantages of High Voltage Direct Current (HVDC) systems over traditional High Voltage Alternating Current (HVAC) systems are becoming increasingly attractive for long-distance transmission. Several research papers on HVDC transmission networks have been published. However, most of them are focused on specific geographic locations or system components. Nonetheless, this study gives a brief yet thorough overview and international assessment of HVDC transmission systems. The following are the important points to be covered in the paper: The state of the art of HVDC technology development, the benefits, economic comparisons, and constraints of HVDC systems, as well as the size of the international HVDC industry market and the impact of COVID-19 on the market, are all explored in-depth, along with a mathematical model for forecasting the evolution of market demand. According to market statistics, the Asia-Pacific region (APAC) is the biggest market and technical leader in HVDC technologies. In addition, the market for HVDC will continue to grow in the forecasted period.

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