Three-phase single-stage boost inverter can provide a relatively high boost ratio (VLLrms/Vdc) in a single stage, with no need for a cascaded dc-dc boost converter, an electrolytic capacitor and a step-up transformer. Moreover, a boost inverter equipped with reverse-blocking IGBTs (RB-IGBTs) utilizes a less number of solid-state switches than the two-stage dc-ac converters. This project entails design, modelling, characterization, control-design, prototyping, and testing of three-phase single stage boost inverter.
Design and characterization of the phasor pulse-width modulation operated three-phase single stage boost inverter: This work focuses on steady-state characterization of the boost inverter in stand-alone as well as grid-tied modes of operation. This work serves to form the knowledge base for the design and analysis of single-stage boost inverter. It also develops a base for the controller design of the three-phase boost inverter. This project is complete and the developed characterization equations have been verified through experimental results.
Active and reactive power flow control from three-phase single stage boost inverter to the grid: In this work, the dynamic models of the boost inverter are developed in the grid-tied mode of operation and these models serve as the basis for the controller design. The controller designed serves the purpose of direct power control. This project is still in progress and the current status being, experimental verification of the developed controller.
Design of a novel permanent magnet generator-converter system for a new class of direct-drive wind turbine system: In this project, the grid side converter of a direct drive wind turbine is replaced by single-stage boost inverter. The wind-turbine generator is subsequently being designed for low voltage operation with a reduction in the size and amount of permanent magnet used in it. This project is in progress and the current status being design of a 3kW prototype of the permanent magnet generator.