A Novel High Bandwidth Current Control Strategy for SiC mosfet Based Active Front-End Rectifiers Under Unbalanced Input Voltage Conditions

Ramkrishan Maheshwari, Ionut Trintis, Lajos Török, Stig Munk-Nielsen, Philip James Douglass, Lorand Bede

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

SiC mosfet based converters are capable of high switching frequency operation. In this paper, the converter is operated with 50-kHz switching frequency for an active front-end rectifier application. Due to high switching frequency, the grid-side filter size is reduced, and the possibility of a high bandwidth current control loop is utilized in this paper. A current control loop with bandwidth of 5 kHz is designed using a proportional-integral controller in synchronously rotating dq-reference frame. In addition, the performance of the controller is tested under unbalanced input supply conditions. During this condition, new feed-forward signals, which are added to the controller output, are proposed. The gain of the feed-forward signal can be modified to achieve balanced sinusoidal grid currents, constant dc-link voltage, or a controlled negative-sequence input current, which are typical application-depending requirements. A closed-form formula to calculate the gain of the feed-forward signal to achieve the above-mentioned requirements is also proposed in this paper. To verify the proposed method, the simulation and experimental results are presented in this paper.

Original languageEnglish
Article number7869318
JournalIEEE Transactions on Industrial Electronics
Volume64
Issue number10
Pages (from-to)8310-8320
Number of pages11
ISSN0278-0046
DOIs
Publication statusPublished - Oct 2017

Keywords

  • DC-AC power converters
  • Silicon carbide

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