Towards Development of Equivalent Model of Hybrid Renewable Energy Source Plant for Voltage Stability Studies

The paper studies the influence of the hybrid renewable energy source (HRES) plant on system voltage stability. System stability analysis is carried out for a set of the most probable annual HRES plant compositions. These compositions are obtained from the historical HRES plant production data set using an unsupervised clustering method. Identification of patterns in the results of voltage stability studies enables the development of equivalent models (EMs) of the whole plant. The EMs are derived in the form of a synchronous machine with adequate reactive power support capability and connected to the grid at the same bus as the HRES plant. The results obtained with the test system have shown that a few EMs are sufficient to represent the whole HRES plant in voltage stability studies throughout the year.