A multilevel inverter for DC reticulation

[摘要] ENGLISH ABSTRACT: This report presents the design and development of a multilevel inverter for DC reticulation.Two main multilevel inverter topologies are introduced and discussed. The researchfocusses on the flying capacitor multilevel topology, since it became evident that it ismore suitable for DC reticulation than the diode clamped multilevel topology.A bootstrap power supply for the gate drive circuits of a multilevel inverter is developedand its feasibility verified experimentally. A self-starting auxiliary power supply, thataims at addressing the power supply problem of DC to AC and DC to DC converters, isdesigned and its functionality demonstrated on a flying capacitor multilevel inverter. AnFPGA based digital controller for implementing the inverter's control algorithms is alsodiscussed. This controller incorporates a feed-forward output voltage regulation technique.Experimental results obtained with the four-level flying capacitor multilevel inverter, usingthe FPGA based digital controller and the self-starting auxiliary power supply, arepresented in this report.

[发布机构] Stellenbosch University