A new stability assessment criterion for dc power systems using multi-level virtual conductors

This paper presents a new stability criterion for bidirectional DC-DC converters in a dc power system. Factually, it is so sophisticated to use conventional stability criteria to assess the stability of a dc power system consists of huge number of nodes. The proposed criterion gives an overall indicator for the stability at each node in the dc power system. It based on perturbing the system at a certain node by injecting a small ac current at this node, and accordingly monitoring the variation of the voltage at this node. Then, the node impedance can be calculated. This node impedance implies the stability status of the system at that node. The concept of the node impedance stability criterion is introduced, and the application of this criterion to a dc power system is investigated, as well.

[1]  Ali Emadi,et al.  Dynamics and control of multi-converter DC power electronic systems , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[2]  Masahito Shoyama,et al.  A multi-level virtual conductor as a backbone of a DC power routing system , 2014, 2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA).

[3]  S.D. Sudhoff,et al.  Electric ship drive and power system , 2000, Conference Record of the 2000 Twenty-fourth International Power Modulator Symposium.

[4]  Husam A. Ramadan,et al.  Multi-level Virtual Conductor Using Bidirectional DC-DC Converters , 2013 .

[5]  Mesut Baran,et al.  DC distribution for industrial systems: opportunities and challenges , 2003 .

[6]  Sihun Yang,et al.  Seamless dynamic model for bi-directional DC-DC converter , 2013, 2013 IEEE 10th International Conference on Power Electronics and Drive Systems (PEDS).

[7]  Robert W. Erickson,et al.  Physical origins of input filter oscillations in current programmed converters , 1992 .

[8]  C. G. Hodge,et al.  The electric warship [electric propulsion] , 1998 .

[9]  Qianzhi Zhou,et al.  Prediction on future DC power system , 2009, 2009 IEEE 6th International Power Electronics and Motion Control Conference.

[10]  Ali Emadi,et al.  Constant power loads and negative impedance instability in automotive systems: definition, modeling, stability, and control of power electronic converters and motor drives , 2006, IEEE Transactions on Vehicular Technology.