优化负载变换器输入阻抗的输入电流内环控制方法被引量：3

Input Current Inner Loop Control Method to Increase the Input Impedance of Load Converters

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摘要为提高级联系统的稳定性,应尽量减小源变换器输出和负载变换器输入阻抗的交集区。一方面,尽量减小源变换器的输出阻抗;另一方面,尽量增大负载变换器的输入阻抗。基于DC-DC变换器的一般性小信号模型,提出以平均输入电流环为内环、输出电压环为外环的双环控制方法,分析在这种控制方式下影响变换器输入阻抗的因素,并给出改变内环电流采样系数前后变换器输入阻抗的量化计算过程。分析表明,当电流内环的截止频率大于电压外环截止频率时,增大电流采样系数,能够提高电流内环环路增益,有效增大负载变换器的输入阻抗。从而在级联系统中,能够有效减小负载变换器的输入阻抗与源变换器输出阻抗的交集,提高级联系统的稳定性。通过仿真和实验验证了所提方法的有效性。 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.

作者王剑贾鹏宇李艳郑琼林郭希铮

机构地区北京交通大学电气工程学院

出处《电工技术学报》 EI CSCD 北大核心 2016年第2期92-101,共10页 Transactions of China Electrotechnical Society

基金北京市科技计划课题资助项目(Z141100003114011)

关键词级联系统 DC-DC变换器输入阻抗输入电流稳定性 Cascaded system, DC-DC converter, input impedance, input current, stability

分类号 TM46 [电气工程—电器]

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