摘要：【中文】本发明公开了一种基于低频电流注入的直流微电网线路阻抗检测方法及装置，属于一种直流微电网运行控制技术领域，该方法通过选取特定频率的交流电流信号，将电流信号注入到储能变换器的电感电流中；注入电流扰动信号后，测量储能单元变换器输入电压和输入电流；根据电路原理中电压与电流之间的关系，计算得到直流母线电压到储能单元之间的线路阻抗；该装置包括：扰动电流注入单元、电压电流测量单元和线路阻抗计算单元，该方法基于阻抗频率特性选择的注入交流电流频率，对系统稳定性影响性较小，还可以改善直流变换器并联均流时的负载均分效果，有利于系统的稳定运行，该装置考虑了各储能单元的线路阻抗，可应用于各种结构的直流微电网，并且该装置结构简单，经济性高，线路阻抗检测效率高。 【EN】The invention discloses a low-frequency current injection-based direct current micro-grid line impedance detection method and a low-frequency current injection-based direct current micro-grid line impedance detection device, which belong to the technical field of direct current micro-grid operation control, wherein in the method, an alternating current signal with specific frequency is selected, and the current signal is injected into an inductive current of an energy storage converter; after the current disturbance signal is injected, measuring the input voltage and the input current of the energy storage unit converter; calculating to obtain line impedance between the voltage of the direct current bus and the energy storage unit according to the relation between the voltage and the current in the circuit principle; the device includes: the device considers the line impedance of each energy storage unit, can be applied to direct current micro-grids with various structures, and has the advantages of simple structure, high economy and high line impedance detection efficiency.