Stability and Bifurcation Analysis of DC Microgrid With Multiple Droop Control Sources and Loads

With the increasing of dc microgrid scale and complexity, it is urgent to obtain the stability rules of dc microgrid. In this article, the dc microgrid model with multiple droop control sources and loads is first established for its inner diversity. By analyzing the distribution of eigenvalues, static characteristics and bifurcation, the key factors and critical conditions of stability and bifurcation of the dc microgrid system are obtained, and the quantitative relationship between the system stability and the parameters such as droop coefficient, line impedance, dc bus capacitance, and load is determined. Additionally, the guidance is provided for the stability judgment of dc microgrid. Finally, the effectiveness of the conclusions is verified by the real-time hardware-in-loop experiments.