Research On Equivalent Model And Interfere With Transmission Lines Of The Geomagnetic Storm

Geomagnetic storm caused drastic changes in the earth’s magnetic field,and then to induction current in power system; Lead to transformer dc bias, the collapse of the system voltage and a series of problems.With the improvement of voltage and complication in power transmission project,geomagnetic storm disturbance to the power grid in our country is increasingly obvious.Paper focus on the equivalent model and interfere with transmission lines of the geomagnetic storm.Firstly,established the equivalent interference model of geomagnetic storms,and analyzed the coupling interference of geomagnetic storm on single back AC line, DC transmission ion flow field and AC/DC parallel lines;On the basis,resolve the coupling effect of geomagnetic storm on regional power grid.Finally,the changing rule of the electromagnetic transient in power system under the geomagnetic storm has been studied.The main innovation work in paper as follows:According to the change law of geomagnetic field triggered by geomagnetic storm,the geomagnetic storm equivalent electromagnetic interference model is established based on the physical coupling field, and calculated the coupling current in separate operation AC transmission lines under geomagnetic storm.Analysis the influence mechanism of geomagnetic storm on HVDC ion flow field,and conclude the HVDC ion flow field distribution under the geomagnetic storm;And then analysis the coupling current in the AC line of AC/DC parallel transmission under the geomagnetic storm.Deduce the coupling coefficient of the geomagnetic storm on regional power grid;According to the geographical location information of a regional power grid substation,get out the coupling interference relationship between regional power grid and the time-varying magnetic field with different change rate and direction caused by geomagnetic storm.Has reference significance for grid construction.Analysis the influence mechanism of geomagnetic storm interference on transmission system;Based on PSCAD/EMTDC simulation tools,set up electromagnetic transient simulation model of AC power system,and then calculation the electromagnetic transient in power system under the disturbance of geomagnetic storm.