A Reactive Power Optimization Strategy for Triple Active Bridge Converter

To solve the problem of low efficiency of triple active bridge (TAB) converter under light load and port voltage mismatch, a reactive power optimization strategy is proposed in this paper. Firstly, the model of TAB converter is established by Fourier transform, and the reactive power expressions are established. Secondly, to meet the requirements of zero voltage switching (ZVS) and power transmission, optimization constraints are set. Then, particle swarm optimization (PSO) is used to solve the reactive power expression globally. Finally, the optimal operating points are subjected to polynomial curve fitting to ensure that the phase shift angle and the transmission power are continuously varied and can be smoothly switched between different modes. Compared with the existed strategies, the proposed strategy can significantly reduce reactive power and realize ZVS in the full power range, improving the overall efficiency. Experimental test verifies the effectiveness of the proposed method.