Bang-Bang Funnel Control of Three-Phase Full-Bridge Inverter Under Dual-Buck Scheme

This article proposes a bang-bang funnel control strategy for the three-phase full-bridge inverter under dual-buck scheme. By adopting the so-called dual-buck scheme, only two switches on the different phase legs are controlled at high frequency, precluding the dead-time utilization. Furthermore, the full-bridge topology can be physically decoupled into two parallel-connected buck units, which allows the inverter to be formulated and analyzed by the dynamic model of buck chopper. The bang-bang funnel controller (BBFC) works with just two control values, and it is able to restrain the tracking error between the system's output and the reference within the prespecified funnel boundaries. The nature of BBFC makes it simpler, faster, and more robust, suitable for the inverter operating in dual-buck scheme. The proposed strategy not only guarantees accurate static output performance, but also promotes the inverter's dynamic response against rapid variations of the load, the reference, and the input voltage, as well as its robustness to the unexpected parameter changes of the elements. Finally, the effectiveness of the proposed strategy is validated by the simulation and experimental results.