Solid state transformer using a modular multilevel inverter for PV farm applications

The aim of this paper is to present the solid state transformer integrated with PV farm applications in the distribution system of PEA grid. A Modular Multilevel Inverter (MMI) circuit, which can be connected to a 22 kV_L-L transmission system is also presented in this paper. The MMI has the capability of current limit if the short circuit fault occurs. The topology of the proposed MMI is the three-level three-phase inverter with the reduced voltage for laboratory use. The proposed idea focusing only on the MMI is validated by simulation and substantiate by the experiment.