Research on Short-Circuit Current Suppression Based on Equivalent Sensitivity

With continuous expansion of power system scale, contradiction between scale of power grid and short-circuit current is becoming increasingly prominent, and electric power researchers have researched from various aspects to limit short-circuit current in grid. As is proposed in this paper, in sub-problem of limiting short-circuit current, short-circuit current is limited to reasonable range by breaking element, and various short-circuit current limit suppression methods are uniformly simulated as adding impedance branch. Furthermore, node impedance parameter matrix of ground state can be used to quickly calculate short-circuit current after current limiting suppression method is adopted, which greatly improves calculation speed. Besides, disconnection suppression method reduces the most short-circuit current with excess nodes, followed by installation of series reactors on the line, and shutdown group has a lower impact on the short-circuit current.