Impedance modulus index calculation method and system for new energy multi-infeed system

The invention discloses an impedance modulus index calculation method and system for a new energy multi-infeed system, and relates to the technical field of power grid load flow calculation and impedance analysis, and the method comprises the steps: collecting power transmission network data, and defining an impedance modulus index; constructing an equivalent impedance matrix of the multi-infeed new energy grid-connected system; based on the node voltage and current relation of the system and the unevaluated new energy equivalently, constructing a node impedance matrix of the system after equivalent grid connection of the unevaluated new energy; equivalently acquiring an impedance modulus index at a new energy node according to the unevaluated new energy; and selecting the new energy grid-connected capacity through the impedance modulus index. According to the impedance modulus index calculation method for the new energy multi-infeed system, through new energy node impedance modulus index calculation, the sta