International Journal of Science, Engineering and TechnologyBattery Energy Storage for Renewable Energy Integrated Power System Stability Enhancement
Authors- R.Gopala Krishnan, M. Agith, R. Aswinth, J. Jayaraj, S. Sathish
– With growing environmental concerns and sustainability movements, renewable energy source (RES) penetration is increasing and expected to have a steady growth in the coming years. Power systems have encountered several inherent technical challenges, resulting from either low inertia contribution by the increased RES or the displacement of fossil fuel generation systems within the network. The decreased system inertia and the decline in power reserve capacity are affecting the dynamic and transient stability performance of the power system adversely and this adverse impact will continue to increase due to further RES penetration in electric power systems. In this context, this thesis contributes new knowledge to the modeling of droop-controlled BESS for enhancing damping capability and transient stability of large- scale power networks with different level of RES penetration. The BESS with conventional Proportional Integral (PI), and two new PI-lead and lead-lag controlled BESS with coordinated charge control are given wider attention. In the initial stage, a wind farm is designed to perform frequency control in a micro grid. A sectional droop gain method is adopted for regulating doubly fed induction generation (DFIG) power output. It is observed that the proposed multi-gain droop control method demonstrates superior performance than the conventional approach. However, DFIG has a certain limit of providing under-frequency support as a result of inherent incapability of regulating incoming wind speed.
