Improving resiliency in renewable energy based green microgrids using virtual synchronous machines controlled inverter

The advent of multilevel inverters brings flexibility in the microgrids´ design for numerous new applications. But, these static power electronic inverters possesses low moment of inertia, which effects the system resiliency in the event of uncertainties. This calls for a philosophy of emulating virtual inertia into the microgrid´s operation while preserving the advantages of renewable energy and power electronics. With this intent, this paper proposes the design of "Virtual Synchronous Motor and Synchronous Generator (VSMSG) Control Scheme" for the inverter that can mimic the behavior of a conventional electrical machines based energy converter. This scheme uses synchronous machines in virtual environment as models that controls the inverter continuously under all conditions. System modeling and simulations are carried out through MATLAB/Simulink®. From results, it is observed that the proposed scheme retains the merits of power electronics and electric machines and improves the resiliency in microgrids through the injection of virtual inertia.