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High performance high bandwidth control of power electronic converters, inverters, and motor drives has become feasible over the past decade. These devices behave as constant power loads over large bandwidths when they are tightly regulated. However, constant power loads have a severe side affect known as negative impedance instability. In order to mitigate the problem of negative impedance instability a new nonlinear system stabilizing controller has been developed. The details of how this controller works along with its implementation is discussed and demonstrated in hardware.

The purpose of this paper is to review the modeling techniques, stability analysis, and design criteria relevant to the design of power electronics based systems (PEBS) such as dc power systems in aircraft. Throughout this discussion these techniques, analysis, and criteria are applied to a laboratory test system in order to illustrate the use and validity of the techniques discussed.