Method for evaluating geomagnetically induced current reactive disturbance effect based on engineering algorithm

Abstract

The invention discloses a method for evaluating a geomagnetic induction current reactive power disturbance effect based on an engineering algorithm, and the method comprises the steps: obtaining geomagnetic data, and determining the ground conductivity, the geomagnetic data comprising geomagnetic disturbance data observed by a geomagnetic station; establishing a ground conductivity model according to the geomagnetic data and the ground conductivity, and calculating an induced ground electric field by using the ground conductivity model; establishing a power grid equivalent model, and solving geomagnetically induced current (GIC) of nodes and branches of the power grid, the geomagnetically induced current (GIC) of the nodes and the branches including a transformer neutral point (GIC); and calculating the reactive power loss of the GIC secondary transformer according to an engineering algorithm and the transformer neutral point GIC. According to the method, the reactive power loss of the GIC secondary transformer can be accurately calculated, reactive power disturbance massively sent by power grid transformers is prevented from threatening power grid safety, and support is provided for stable operation of a power grid.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method for evaluating reactive disturbance effects of geomagnetic induction currents based on engineering algorithms. Background technique [0002] A geomagnetic storm is a violent global disturbance of the earth's magnetic field, which generates a geomagnetically induced current (GIC) in the loop formed by the transmission line, the grounded transformer at both ends, and the earth. In the case of GIC, it will have a great adverse impact on the power grid, causing problems such as half-wave saturation of the transformer and increased reactive power loss. Moreover, the reactive power loss derived from GIC flowing through the transformer has the same simultaneity in the regional power grid, and the reactive power disturbance generated by the grid transformer group threatens the safety of the power grid, resulting in the reduction of grid voltage and reactive power fluctuati...

AI Technical Summary

Problems solved by technology

[0004] However, the current methods for the reactive power disturbance effect of geomagnetic induction current are relatively limited, and there are problems of poor applicability and low accuracy. Therefore, there is a lack of methods in the prior art that can accurately calculate the reactive power loss of GIC secondary transformers

Images