Transient Stability Overview : DC Transmission Lines

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For transient stability simulations, DC transmission lines without a dynamic model specified are modeled as part of the algebraic network equations in much the same way they are modeled in a power flow solution for steady state analysis. The only exception when moving to a stability simulation is that all DC lines (as well as DC converters for multi-terminal DC lines) are assumed to operate in current control mode during the stability simulation. For those which are configured for power control mode in the steady state power flow input, Simulator will change the control mode to current and change the setpoint to the steady state current on the device.