In this paper, virtual impedance is introduced and the function of virtual impedance is analyzed, the value range of virtual resistance is determined by the rated capacity ratio of inverter, which can effectively guarantee the power quality of the output of microgrid. The virtual impedance adaptive ability is poor in the traditional method.
4. Dynamic analysis and damping enhancement of DC microgrid From the impedance modeling in section III, the small signal impedance model of dc microgrid is composed of the source-side output model Zdc(s) of the DC/DC converter, the dc line model Zline(s) and the load-side input models Zr-load(s), ZCPL-load(s) and ZIM-load(s).
The overall small signal impedance model diagram of dc microgrid. Then according to (28), the impedance ratio of Zout(s) and Zin(s) of the dc microgrid system is Tm(s) = Zout(s)/Zin(s).
Conclusion In this paper, the impedance modeling and dynamic analysis of dc microgrid with multiple types of loads are presented. Theoretical analysis based on Nyquist criteria indicates that the damping characteristics of CPL is worst and the dynamic response becomes improved when IM load is connected.
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