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This paper proposes a nonlinear, adaptive controller to increase thestability margin of a direct-current (DC) small-scale electrical networkcontaining a constant power load, whose value is unknown. Due to their negativeincremental impedance, constant power loads are known to reduce the effectivedamping of a network, leading to voltage oscillations and even to networkcollapse. To tackle this problem, we consider the incorporation of a controlledDC-DC power converter between the feeder and the constant power load. Thedesign of the control law for the converter is based on the use of standardPassivity-Based Control and Immersion and Invariance theories. The goodperformance of the controller is evaluated with numerical simulations.

Active Damping of a DC Network with a Constant Power Load: An Adaptive Passivity-based Control Approach