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| Input Current Inner Loop Control Method to Increase the Input Impedance of Load Converters |
| Wang Jian, Jia Pengyu, Li Yan, Zheng Qionglin, Guo Xizheng |
| School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China |
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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.
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Received: 03 December 2013
Published: 03 March 2016
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2016, Vol. 31 
