Abstracts Computer Science

Deadbeat contolled PWM converter

by Jian Hu

The thesis has evaluated the suitability of Digital Deadbeat Control of the Sinusoidal Pulse Width Modulation-Voltage Source Converter (SPWM-VSC) for electric power utility applications. The Digital Deadbeat Controlled SPWM-VSC operates as a current controller where short circuit faults are not destructive. In addition, it eliminates the L-R mode at the ac terminals of the SPWM-VSC. The thesis considers methods to immunize the control from system and parameter uncertainties. A novel closed-loop Digital Deadbeat Control has been proposed. A Phase Lock Loop (PLL) suitable for this application is developed. Together with the PLL, the Digital Deadbeat Controlled SPWM-VSC has been shown to be capable of (1) independent control of current Id and Iq, (2) near sinusoidal current waveforms, (3) broad operation frequency range. Digital simulation is used in the thesis to prove the performance of the Digital Deadbeat Controlled SPWM-VSC.