Title :
Input impedance improvement by using digital compensation strategy for high power density rectifiers with wide load operation
Author :
Shengbao Geng ; Fei Wang ; Lijun Hang ; Yong Wang
Author_Institution :
Dept. of Electr. Eng., Shanghai Jiao Tong Univ., Shanghai, China
Abstract :
In this paper, an improved control loop based on feedforward is proposed to reduce the total harmonic distortion of the input current (THDi), realizing power factor correction (PFC) in MCM. The frequency responses of the input impedance for a wide frequency range are improved and unified by adding feedforward duty-ratio to the output of the original current-loop. A 5 kW experimental prototype is built to verify the validity of this strategy. The experimental results show that the system has close to unity power factor (PF), and THDi is significantly reduced.
Keywords :
feedforward; harmonic distortion; power factor correction; rectifiers; MCM; PFC; THDi; control loop; digital compensation strategy; feedforward; feedforward duty-ratio; frequency responses; high power density rectifiers; input impedance; power 5 kW; power factor correction; total harmonic distortion; unity power factor; wide load operation; Feedforward neural networks; Impedance; Pulse width modulation; Rectifiers; Switches; Topology; Digital control; continuous-conduction mode (CCM); discontinuous-conduction mode (DCM); mixed-conduction mode (MCM); power electronics; power factor correction (PFC);
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE
Conference_Location :
Fort Worth, TX
DOI :
10.1109/APEC.2014.6803417
