I am searching for possible ways/techniques/control algorithms which can be utilized to reduce the DC link capacitor sizing in a bidirectional full bridge AC/DC converter. Can you kindly suggest the possible control techniques which can be utilized for this purpose?
Check this paper, it will help you: "Integration of an Active Filter and a Single-Phase AC/DC Converter with Reduced Capacitance Requirement and Component Count". It helped me in some of my designs for single phase systems
following ways can be adopted in order to reduce the DC capacitor size:
1) using both capacitor and active filters as done by red devil company who won the Google little box challenge.
2) enhancing the switching frequency of the semiconductor devices, some semiconductor devices have more limitation in switching frequency.
3) using proper switching strategies such as SVM, PWM and any intuitive technique.
Check this paper: "Compensation of DC-link oscillation in single-phase to single-phase VSC/CSC and power density comparison". It shows how to reduce the DC-link size by adding a third leg to the full-bridge converter.
Also, if you are working with a back-to-back converter, this one could be more helpful: "Single-Phase to Single-Phase Full-Bridge Converter Operating With Reduced AC Power in the DC-Link Capacitor".
Both of them are available in the IEEE Xplore.
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