Modeling of Induction in Integrated Power-Gas Systems Due to Geomagnetic Disturbances

Rigorous evaluation of geomagnetic induction in the integrated power-gas systems (IPGS) is critical for the risk assessment of geomagnetic disturbances (GMD). Existing geomagnetic induction models are developed individually for the power grids or pipeline networks. This paper proposes a nodal voltage analysis method for the geomagnetic induction modeling in the IPGS considering the interaction between the power grids and pipelines. The conductive coupling of grounded nodes in the IPGS, including substation grounding grids and buried pipelines, is modeled with the ground transfer resistance. Several IPGS test cases are used to illustrate the impacts of the interaction on the induced voltages and currents. The influences of spatial patterns and resistance parameters of IPGS as well as earth resistivity structures on the interaction are discussed

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