Sensorless Feedforward Current Control of Dual-Active-Bridge DC/DC Converter for Micro-Grid Applications

Duy Dinh Nguyen, Dinh Hoa Nguyen, Minh C. Ta, Goro Fujita

Research output: Contribution to journalArticle

Abstract

In Dual-Active-Bridge converter control system, high frequency terminal current is usually measured then fed-back to the current mode controller. However, the measurement requires wide bandwidth sensors, fast and precise operational amplifier, and high sampling rate Analog to Digital conversion. This paper proposes a Proportional Integral Observer to estimate such the current to eliminate the need of current sensors. A combined feedforward-feedback control system is then developed to enhance the system dynamics and to regulate the output voltage. The control system needs only the information of terminal voltages. Simulation and experiment results show that the observer performs fast and accurately with acceptable observation error; and the output voltage is well regulated regardless of load changes.

Original languageEnglish
Pages (from-to)333-338
Number of pages6
JournalIFAC-PapersOnLine
Volume51
Issue number28
DOIs
Publication statusPublished - 2018 Jan 1

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Keywords

  • Dual-Active-Bridge converter
  • Feedforward controller
  • Proportional Integral Observer
  • Sensorless current control
  • Solid-State-Transformer

ASJC Scopus subject areas

  • Control and Systems Engineering

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