Abstract
With the growing scale of the power grid and the improvement of the voltage level, the geomagnetically induced currents (GICs) generated by geomagnetic storms has become one of the leading factors that cause large-scale power outages in power grid. Considering the global simultaneity characteristic of geomagnetic storms, this paper presents the concept of mass reactive power disturbance for the first time, analyzes the mechanism of GIC reactive power loss of transformer and reveals the mechanism of mass reactive power disturbance’s influence on voltage. Finally, combined with the practical situation of 750kV EHV power grid in China, the reactive power loss and voltage distribution under the geomagnetic storms at various intensities are calculated, with the grid operating in two typical modes, and the impact of the geomagnetic storm on voltage is illustrated, which provides the theoretical basis for the study of voltage stability.
Highlights
The geomagnetic storm generates a geomagnetically induced current (GIC) in the circuit composed of the transmission line, grounding transformer at both ends and earth [1]
Is more than three times that of the three-phase shell and the three-column. It can be seen from [11] that the GIC of the EHV long-distance transmission line is larger under the same induced geoelectric fields, the single-phase transformer is basically used in the EHV grid, so that the reactive power loss caused by GIG in EHV power system will be greater, and whether such a large reactive loss will cause voltage stability remains to be further studied
Based on the study of the mechanism of reactive power loss of transformer GIC, the concept of mass reactive power disturbance in power grid is proposed in this paper
Summary
The geomagnetic storm generates a geomagnetically induced current (GIC) in the circuit composed of the transmission line, grounding transformer at both ends and earth [1]. If the entire system is not effectively regulated, a large-scale blackout accident will occur [3] Such as the Quebec power grid blackout accident on March 14, 1989; On October 30, 2003, Malmö in northern Sweden caused a blackout caused by a strong geomagnetic storm [4] , countries such as China, Brazil, South Africa and Japan have suffered from different degrees of geomagnetic storms on the grid [5]. Based on the 750kV EHV power grid in Northwest China, the reactive power loss and voltage distribution of transformers at various geomagnetic storm disturbance (GMD) severity levels is analyzed and the effect of geomagnetic storm on voltage is revealed in this paper. The results provide theoretical basis for voltage stability study at various GMD severity levels
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