Contribution of PV systems with ultra capacitor energy storage on inter-area oscillation

In this paper, the effect of increased solar power penetration by three Photovoltaic (PV) generator systems on inter-area oscillation is investigated. With the help of an illustrative example, it is shown that general trends for PV generator is to increase the damping of inter-area mode oscillation. However, there are exceptions for certain types of system, location and penetration for which PV generator can reduce damping of the inter-area mode. Analysis of different PV generator system´s contribution to the damping of inter-area mode has been carried out by a two-area test system. Eigenvalue analysis has been employed for detailed study along with participation factor and eigenvalue sensitivity analysis. Performance measures such as damping ratio and line performance index (LPI) are also used for further analysis of the contributions of PV systems on inter-area oscillation and the system performance.