Control and operation of multifunctional NPC inverter for Grid-connected solar PV

As low voltage PV installations is increasing, day by day it results in creating additional power quality problems to distribution grid networks. Therefore, it becomes necessary, that PV inverter will provide more ancillary services to support reliable and stable grid-connected operations the multifunctional smart inverter is proposed in this work. Conservative power theory-based Neutral point inverter (NPC) inverter for multiple operations in grid-connected solar applications is presented here. Present inverter besides supplying active / reactive support also provide islanding detection capability, serves as an active filter, reactive power compensator and power factor corrector. Simulation results with detailed analysis are discussed in the paper.