SINGLE-PHASE T-TYPE TRANSFORMERLESS NPC- MLI

Electrical Engineering

This inverter topologies highly suffered with leakage current flow through the ground path and the inverter power circuit. Hence, these inverters had a shoot-through (shot circuit) problem in the inverter bridge legs and hence leakage current in the inverter should be suppressed through via their freewheeling or overwhelming conduction path. The NCP-MLI topologies is being immensely used in PV application due to its enhanced performance as compared to two-level voltage source inverter. In NPC-MLI topology, compare to “I” type, “T” type has a great compatibility, since it is free from clamping diodes. Hence, in this research develop a T – type transformer less NPC-MLI topology for PV grid connected system. The main objective of this work is to build a closed loop grid connected PV tied single phase T - type transformer less NPC-MLI. The proposed inverter model, modes of operation and control for PV tie system is presented in detailed. The MATLAB/Simulink based study show that the proposed inverter attains high efficiency operation for PV input, and parades leakage currents reductions, and fulfils the transformerless inverter topology regulations and norms.

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