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Input-Output Properties of the Swing Dynamics for Power Transmission Networks with HVDC Modulation

Abstract:

There is a growing need for wide-area evaluation and control of fast dynamics in the bulk power transmission network, and at the same time new technologies are coming to fruition that enable such control. Analyzing disruptions and designing wide-area controls crucially requires understanding input-output properties of the power network's swing dynamics. In this article, we study input-output properties of the classical swing dynamics model - specifically, the finite zeros of input-output channels in the model - from a graph theory perspective. Because deployed controls for high-voltage direct-current (HVDC) lines are known to impact transients/oscillation across a wide area, we also enrich the model to represent modulated (controlled) HVDC, and analyze the zeros of the enriched model. The analyses demonstrate that the graph topology of the power network, the location of the input-output channel, and the type of control used on the HVDC line, primarily determine whether or not the dynamics is minimum phase.