中文摘要：

由于直流微电网系统阻抗的复杂性易导致系统稳定性恶化,为此从直流微电网的结构特点入手,给出了一种基于直流微电网节点阻抗特性的系统稳定性分析方法。在考虑线缆阻抗的前提下,把系统支路简化为包含虚拟阻抗的诺顿等效电路,并分析了线缆电感参数对支路输出阻抗特性的影响。然后,从系统节点和支路阻抗模型出发,建立了一个简单直流微电网系统的节点导纳模型和导纳矩阵。利用系统的节点导纳矩阵,易求取系统的任意节点阻抗。最后,利用节点阻抗特性完成了对系统稳定性的判定,且通过仿真验证了所提方法的有效性。

英文摘要：

Considering the complexity of DC microgrids system impedance easily leading to the deterioration of the system stability, this paper proposes a node impedance-based analytical method from the system structure characteristics for the analysis of the DC Microgrids stability. Taking reasonable cable parameters into account, branches of DC Microgrids are modeled as a Norton＇s equivalent circuit based on virtual impedance modeling method, and influence of cable inductance on output impedance characteristics of micro source branch is analyzed. Then, a simple DC Microgrids is established, its equivalent admittance model and admittance matrix are derived by focusing on system branches and nodes. Besides, based on admittance matrix, node impedance can be easily obtained. Finally, by analyzing system node impedance characteristics, stability of DC Microgrids can be identified, and the proposed analytical method is verified with simulations with MATLAB/Simulink.