Method for analyzing small disturbance voltage stability of geomagnetic storm to power system

Abstract

The invention relates to a method for analyzing the small disturbance voltage stability of a geomagnetic storm to a power system, and the method comprises the steps: S1, building a layered earth conductivity model, and calculating a geomagnetic storm induction earth electric field; S2, calculating reactive power loss of the transformer caused by the geomagnetic induction current by using a K value method; S3, calculating the GIC-Q of the transformer substations of the multiple geomagnetic storm events under the long-time scale, and performing fitting to obtain a probability density distribution function and a cumulative probability density distribution function of the GIC-Q of each transformer substation; S4, establishing a synchronous generator, an excitation system, an asynchronous motor load and network model, and performing linearization; S5, selecting a root strongly correlated with the dynamic load equivalent asynchronization and the transformation ratio of the on-load voltage regulating transformer according to the participation factors; and S6, fitting a probability distribution function of a feature root real part, and establishing a risk evaluation index of system probability instability caused by geomagnetic storm in combination with the oscillation instability risk coefficient.

Description

technical field [0001] The present invention relates to the interdisciplinary field of geomagnetic storm and small-disturbance voltage stability research of power system, especially the transformer reactive power loss increment (GIC- Q) Calculate the distribution of the characteristic roots of the power system state matrix. Background technique [0002] The increase of transformer reactive power loss caused by geomagnetically induced current (GIC) will destroy the reactive power balance of the system, resulting in transformer damage or even a major blackout. Research by the North American Electric Reliability Association found that the cause of the Quebec blackout on March 13, 1989 was the increase in reactive power loss of transformers caused by GIC, resulting in reactive power imbalance and eventually voltage collapse. [0003] The global synchronization of geomagnetic storms makes transformer GIC reactive power loss (GIC-Q) group-wide, and the uncertainty of geomagnetic ...

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Problems solved by technology

However, whether applying GIC-Q as a shock load to the system will affect the small-disturbance stability of the system has not yet been studied.

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