Abstract：To improve the stability of cascading system, the intersection range of output impedance and input impedance should be decreased. That is, the output impedance of source converter should be decreased, while the input impedance of load converter should be increased. Based on the unified small signal model of DC-DC converter, the double loop control method with input current inner loop (ICIL) and output voltage outer loop is proposed. The input impedance is analyzed under this situation, and the quantization calculation process of the input impedance is provided when the current sampling factor is changed. It is shown that when the cross-over frequency of the current loop is larger than that of the voltage loop, the input impedance increases significantly as the current sampling factor increases. Therefore the impedance intersection of source and load converters will be decreased to improve the stability.
王剑, 贾鹏宇, 李艳, 郑琼林, 郭希铮. 优化负载变换器输入阻抗的输入电流内环控制方法[J]. 电工技术学报, 2016, 31(2): 92-101.
Wang Jian, Jia Pengyu, Li Yan, Zheng Qionglin, Guo Xizheng. Input Current Inner Loop Control Method to Increase the Input Impedance of Load Converters. Transactions of China Electrotechnical Society, 2016, 31(2): 92-101.
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