Analysis And Studies On The Problem Of GIC In Northwestern Power Grid

Geomagnetic storm may cause geomagnetically induced current (GIC), whichbrings many ill-effects to the electric transmission line. With the increasingly expandingscale of our country's power grid, it is of critical importance to study the GIC in the grid.The characteristics of the northwestern power grid, such as high geographical latitudeand complex geological framework, determine that the GIC problem of our country'snorthwestern power grid worth further studying.This article first analyzes the ill-effects of GIC on transformers, generators,protective relaying equipments, and so on, as well as the blackout of the Quebec PowerSystem in Canada as a consequence of the severe GIC. Considering the feasibility, thearticle then establishes the model of soil resistivity, adopts the Plane Waves Method tocompute ESP on the major transmission lines, proceeds the simulation analysis on themain lines of the present 330kV power grid and the planned 750kV power grid in thenorthwest with the Canadian PSCAD/EMTDC software, and presents suggestions forprevention and solution.