双有源全桥变换器全状态离散迭代建模与输出电压纹波分析

By analyzing the drawbacks of the conventional discrete-time model of the dual active bridge (DAB) converter, the full-state discrete-time model of the DAB converter is proposed, and the output-voltage-ripple analysis under different system parameters and working condition is conducted. The conventional discrete-time model of the DAB converter is based on the interval-by-interval iteration, which will miss many essential information of the state variables and cannot reflect the actual working condition of the converter. By analyzing the working principle of the converter, the proposed full-state discrete-time model can reveal all the crucial information of the state variables. Taking the output voltage as an example, the full-state discrete-time model can reveal the output-voltage information at the subinterval switching moment. Therefore, the output-voltage-ripple analysis is more accurate and conducive to improving system reliability. The experimental results also verify the proposed model and the analysis results.