PROJECT TITLE :

A Novel High Bandwidth Current Control Strategy for SiC MOSFET Based Active Front-End Rectifiers under Unbalanced Input Voltage Conditions - 2017

ABSTRACT:

SiC mosfet based converters are capable of high switching frequency operation. During this paper, the converter is operated with fifty-kHz switching frequency for an energetic front-finish rectifier application. Thanks to high switching frequency, the grid-side filter size is reduced, and the likelihood of a high bandwidth current management loop is utilised in this paper. A current management loop with bandwidth of 5 kHz is intended employing a proportional–integral controller in synchronously rotating dq-reference frame. Still, the performance of the controller is tested beneath unbalanced input provide conditions. During this condition, new feed-forward signals, that are added to the controller output, are proposed. The gain of the feed-forward signal can be changed to achieve balanced sinusoidal grid currents, constant dc-link voltage, or a controlled negative-sequence input current, which are typical application-relying necessities. A closed-type formula to calculate the gain of the feed-forward signal to attain the higher than-mentioned necessities is also proposed during this paper. To verify the proposed methodology, the simulation and experimental results are presented in this paper.