STATCOM a shunt connected Flexible Alternative Current Systems (FACTS) device using for fast control of voltage and reactive power control in the power grid. To optimize Nouakchott power system at 2030 year, we anticipate both generation and demand grow. A set of nonlinear equations are solved through Newton Raphson method and programmed in PSS/E and MATLAB. The results will be analyzed for two situations, without STATCOM and with STATCOM connected to the grid. The found results show the degree of performance and capacity of STATCOM to reduce the power mismatches, improve the voltage at buses and reduce the harmonics in Nouakchott power system. The impact of the renewable energies to improve transient stability of system will be considered. In the end, the power system is optimized at 2030 year by integration the STATCOM device. It will be generating or absorb reactive power to stabilize the system voltage at 1 pu. That means enhances transits active power thereby providing additional capacity to consumers.

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