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Transient Performance Improvement of a Solid State Transformer Integrated DC Microgrid System using Virtual Inertia Control

The reliability and sustainability of modern power system is increased by incorporating microgrids comprising Distributed Renewable Energy Resources (DRER). But due to lack of inertia of the microgrid and intermittent nature of DRERs, the transient stability is compromised. In this paper, a Virtual Inertia Control (VIC) strategy is implemented to improve the transient behavior of a Solid State Transformer (SST) integrated DC microgrid system during the transition between grid-connected mode and islanded mode and under varying load conditions. The SST connects the whole system with the utility grid considering its various advantages over a conventional transformer. The design, control and operational analysis of the microgrid system which consists of a PV array, wind turbine (WT), battery bank and solid-state transformer (SST) is carried out before adopting VIC technique. The bidirectional DC-DC converter (BDC) used for interfacing the battery is controlled in such a manner so that it emulates the inertia characteristics of a synchronous machine and supply inertia to the system. MATLAB/Simulink environment is used for demonstrating the effectiveness of the control strategy for enhancing the transient performance of the DC Microgrid.