Advanced high-power shipboard applications such as electromagnetic rail-guns, semiconductor lasers, advanced radar, etc. create an emergent need to support large electric loads on various Navy vessels. With the necessary push towards highly regulated DC distribution through power electronics on shipboard power systems, these loads are becoming more likely to cause destabilizing behavior at their source interfaces. The stability of a system can be understood as the ability to operate as intended at a given operating point and if perturbed, the disturbance to the system will diminish over time and the system will return to its original operating behavior. Traditionally, it has been sufficient to analyze small signal stability through testing the ratio of the source impedance and load impedance with respect to the Nyquist Criterion. However, for Navy power systems with more complex circuit topologies and a trend towards higher switching frequencies, the impact of dual feed interfaces as well as previously unaccounted for common mode currents, could cause erroneous stability assessments when applying traditional techniques. This paper proposes a new method to classify the small signal stability of a complex DC interface. This is done through an expanded characterization of a system’s impedances to address the coupling between all interface connections. In this study, an example power system is defined and classified using traditional techniques in comparison to the technique proposed.


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    Title :

    The Generalized Nyquist Criterion Applied to Complex DC Power System Networks


    Contributors:


    Publication date :

    2019-08-01


    Size :

    1607814 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English