Optimal Allocation Renewable Energy Sources to Enhance Transient Stability of Active Distribution Networks

Optimal allocating different rotational or inverter-based distributed generations (DGs) have facilitated the power systems’ flexibility of operation. However, the deterioration of mechanical inertia due to allocating inverter-based DGs may threaten the dynamic security of the active distribution network. This study aims at transient stability preservation of the active distribution network. The transient stability preservation is accomplished based on the new objective function (OF) that maximizes the possible penetration level of the inverter based DG. The latter maximization result into the least deterioration of the transient stability margin. The proposed transient stability OF, relying on the critical clearing angle (CCA), is essentially an index being improved by taking into account both rotational and inverter based DGs. The procedure of calculating CCA is based on hybrid algorithm containing a sensitivity analysis together with some modifications on equal area criterion. The nature of CCA calculating procedure is so that the probable topology changes due to reconfigurations are also considered in the optimization problem. Photovoltaic panels, wind turbines, and electrical vehicles are investigated as the DGs. The IEEE 123-bus test system is adopted as the testbed to apply the proposed framework to. Further validation has been ensured considering several fault conditions. © 2022 School of Science, IHU. All rights reserved.