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 language | English |
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Title of host publication | 2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe) |
Publisher | Institute of Electrical and Electronics Engineers |
Number of pages | 10 |
ISBN (Electronic) | 9789075815375 |
Publication status | Published - 25 Oct 2021 |
Event | 23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe - Ghent, Belgium Duration: 6 Sept 2021 → 10 Sept 2021 Conference number: 23 |
Conference
Conference | 23rd European Conference on Power Electronics and Applications, EPE 2021 ECCE Europe |
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Abbreviated title | EPE 2021 |
Country/Territory | Belgium |
City | Ghent |
Period | 6/09/21 → 10/09/21 |
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