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.