Ph.D. student Ms. Minjeong Kim gave a presentation entitled “Control of capacitorless ac link inverters ” at the Texas A&M Energy and Power Group Research Day in College Station, Tx, USA on November 8, 2019.
In the presentation, Minjeong discussed the advantages of an ac-link inverter over the traditional dc-link topology and presented new control methods that she developed to ensure safe and proper commutation. The dc-link capacitor is well-known to be an Achilles heel, causing reliability problems and reducing the lifetime of inverters. The ac-link inverter eliminates the rectification step in a conventional two-stage inverter and processes the square-wave link voltage directly into grid-compatible sinusoidal voltage. Ms. Kim discussed new control methods for the three-phase voltage sourced high-frequency ac link inverters and presented results from her research.