Abstract
The penetration of hybrid green power systems (HGPSs) into power systems that often include photovoltaic arrays and wind turbines is increasing and, for the on-grid systems, the issue of reactive power management has become steadily important. As the objective of this study, the optimal design of a static compensator (STATCOM) for an on-grid HGPS is investigated, where the size parameters of the system, along with voltage amplitude and angle of the STATCOM are determined, as lines congestion constraints are met. The imperialist competitive algorithm is employed to solve the nonlinear optimization problem. Based on results from case study with IEEE 30-bus test system, it is determined that utilization of STATCOM can positively affect the distribution of reactive power in the electrical network and improve congestion that occurs in specific hours of HGPS operation. The result show that the overall efficiency of HGPS with and without STATCOM is 45.54% and 39.5%, respectively, while the investments cost for HGPS with STATCOM is 1.9% lower than that of its counterpart.
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