T01.3 - Direct Digital Control Applied to T-Type Vienna Rectifiers for Power Factor Correction

Tuesday, March 18, 2025

9:10 AM – 9:30 AM ET

Location: Level Three, A315

Technical Lecture Presenter(s)

Jun-Yang Chang

National Tsing-hau University

Presentation Paper

Co-Author(s)

Tsai-Fu Wu, PhD

National Tsing Hua University
Chien-Chih Hung

National Tsing Hua University
JC

Jui-Yang Chiu

National Tsing-hua University

This paper develops a three-phase three-wire T-type Vienna rectifier with decoupled direct digital control (DDDC) for power factor correction (PFC). It features lower component voltage stress, reduced input current harmonics, boost-type topology, and higher power density. The DDDC strategy is adopted to simplify the derivation of control laws through a division-summation (D-Σ) process. This control method does not need abc-to-dq frame transformations; thus, it results in a simple derivation and programming. Furthermore, not only can the control laws handle the normal input voltage, but they can handle imbalance and distortion grid conditions. The successful control of three-phase decoupling is achieved, making the rectifier more effective. Experimental results from a 6 kW-prototype verify the analysis and discussion.