Enhancing power system voltage stability through a centralized control of renewable energy sources

The integration of renewable energy sources in power systems has steadily increased in the recent years in the vision of significantly decreasing the carbon emissions produced by the conventional power plants. Although the incorporation of the renewable energy sources in the power system network is environmentally beneficial, at the same time it poses some challenges regarding their smooth operation and control. In this sense, the renewable energy sources should be considered not only as passive elements in the power system network, but, if possible, as ancillary services for the mitigation of evolving contingencies. In this paper, a methodology to preserve the voltage stability of the power system after the occurrence of a contingency utilizing the renewable energy sources is presented. The proposed methodology was applied to the IEEE 14-bus system and simulation results are provided.