Superior usage of the Bidirectional Isolated Series-Resonant AC/DC Converter

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Abstract

Conventionally, grid-connected isolated AC/DC conversion is realized through a two-stage approach, resulting in an increased number of (magnetic) components and thus a cost-inefficient solution. Therefore, this paper focusses on an extension of a recently proposed control strategy, i.e. bidirectional charge control, for a bidirectional, isolated, series-resonant DC/DC converter. Bidirectional charge control targets a predefined charge displacement between two consecutive zero-crossings of the resonant current and calculates the required switching levels for the semiconductor switches accordingly. These switching levels are defined as a function of the charge difference across the resonant capacitor, realizing dynamic, bidirectional operation of the series-resonant converter while guaranteeing zero-voltage switching of all switches. In order to maintain grid quality, grid-tied converters are verified for compliance regarding their harmonic current emissions and total harmonic distortion (THD). Therefore, power-factor correction (PFC) is a requirement for each of these converters. To achieve power-factor correction, a phase-locked loop is implemented with an outer control loop to realize sinusoidal grid-current waveforms and, as a result, low harmonic current emissions that do comply to the standards and a low THD. The discussed control algorithm and the linearization are verified through simulation for a 3kW electric vehicle battery charger to connect to the single-phase grid. Nonetheless, wide primary, grid voltage and wide secondary, electric vehicle battery voltage ranges have been shown applicable with bidirectional charge control. Although the simulations show very promising results, realization on a prototype is recommended to validate the theoretical analysis and prove the robustness of the proposed control strategy.

Original languageEnglish
Title of host publication2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)
PublisherInstitute of Electrical and Electronics Engineers
Number of pages10
ISBN (Electronic)9789075815375
Publication statusPublished - 25 Oct 2021
Event23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe - Ghent, Belgium
Duration: 6 Sept 202110 Sept 2021
Conference number: 23

Conference

Conference23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe
Abbreviated titleEPE 2021
Country/TerritoryBelgium
CityGhent
Period6/09/2110/09/21

Keywords

  • AC-DC Converter
  • Converter control
  • Grid-Connected Converter
  • High Frequency Power Converter
  • Model-based Predictive Control (MPC)
  • Optimal Trajectory Control
  • Resonant Converter
  • Soft Switching
  • ZVS Converters

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