Generalized Model of n-Port Modular Multiactive Bridge Converter With Multiple-Phase-Shift Modulation

The modular multiactive bridge (MMAB) converter is a promising multiport converter topology for integrating multiple energy sources, energy storage systems, and loads. However, a generalized model of the MMAB converter has not been derived. In this study, an $n$ -port MMAB converter model with multiple-phase-shift (MPS) modulation based on the generalized state-space averaging method is proposed. This model is generalized for the converters with an arbitrary number of ports and diverse modulation strategies. It is also applicable to scenarios where the port consists of multiple H-bridge modules connected in series or parallel. In addition, this model considers the conduction loss, the transformer core loss, the magnetizing impedances, and the dynamic effects of high-frequency inductor current, which improves the accuracy of the model. The calculation difficulty of the model is moderate, and this model can be used for controller parameters design and stability analysis. Based on the generalized average model, the small-signal model and the small-signal equation for the control variables to the port output voltage are derived. The simulation and the experimental results agreed well with the predictions of the proposed model, confirming the accuracy and correctness of the model.