Self-Regulated Solar PV Systems: Replacing Battery via Virtual Inertia Reserve

The replacement of synchronous generator (SG) via inertia-less renewable energy sources (RES), proves to be a huge threat for grid stability. To protect the grid from failure, derivative controlled energy storing systems (ESS) are extensively used for providing virtual inertia support. However, the short life span, maintenance requirement, large space, and high cost of ESS; put an extra burden on the economics of microgrid. This paper proposes a novel PI damping based virtual inertia technique, which de-loads the PV for generating virtual inertia reserve (VIR). This VIR strengthen the weak microgrids and enhanced their dynamic response during the contingency period, without ESS. To test the effectiveness of the proposed model, different practical situations are simulated ranging from heavy rain conditions to deep RES penetration. Simulation results confirm the excellence of the proposed model over conventional and ESS based virtual inertia techniques.